tdf#36737 - Initialize default values of optionals

Initialize default values of optionals in function headers.

In LO Basic, optional parameters are allowed, but without
any default values. Missing parameters will not be initialized
to their respective default values of its datatype, either.

With option Compatible, optional parameters are allowed
with default values. Missing optional parameters that
don't have explicit default values will not be initialized
to their default values of its datatype.

With option VBASupport, optional parameters are allowed with
default values. Missing optional parameters that don't have
explicit default values will be initialized to their default
values of its datatype.

Change-Id: I57aabae5f70d1cf6c4e8feb95ce0db6af753383c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/87550
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
diff --git a/basic/qa/basic_coverage/test_ismissing_basic.vb b/basic/qa/basic_coverage/test_ismissing_basic.vb
new file mode 100644
index 0000000..8705220
--- /dev/null
+++ b/basic/qa/basic_coverage/test_ismissing_basic.vb
@@ -0,0 +1,202 @@
Dim passCount As Integer
Dim failCount As Integer
Dim result As String

Const IsMissingNone = -1
Const IsMissingA = 0
Const IsMissingB = 1
Const IsMissingAB = 2

Function doUnitTest() As String
    result = verify_testIsMissingBasic()
    If failCount <> 0 Or passCount = 0 Then
        doUnitTest = 0
    Else
        doUnitTest = 1
    End If
End Function

' tdf#36737 - Test optionals with different datatypes. In LO Basic, optional
' parameters are allowed, but without any default values. Missing optional parameters
' will not be initialized to their respective default values of its datatype, either.
Function verify_testIsMissingBasic() As String

    passCount = 0
    failCount = 0

    result = "Test Results" & Chr$(10) & "============" & Chr$(10)
    testName = "Test optionals (Basic)"
    On Error GoTo errorHandler

    ' optionals with variant datatypes
    TestLog_ASSERT TestOptVariant(), IsMissingAB, "TestOptVariant()"
    TestLog_ASSERT TestOptVariant(123), IsMissingB, "TestOptVariant(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptVariant(, 456), IsMissingA, "TestOptVariant(, 456)"
    TestLog_ASSERT TestOptVariant(123, 456), IsMissingNone, "TestOptVariant(123, 456)"

    ' optionals with variant datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptVariantByRefByVal(), IsMissingAB, "TestOptVariantByRefByVal()"
    TestLog_ASSERT TestOptVariantByRefByVal(123), IsMissingB, "TestOptVariantByRefByVal(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptVariantByRefByVal(, 456), IsMissingA, "TestOptVariantByRefByVal(, 456)"
    TestLog_ASSERT TestOptVariantByRefByVal(123, 456), IsMissingNone, "TestOptVariantByRefByVal(123, 456)"

    ' optionals with double datatypes
    TestLog_ASSERT TestOptDouble(), IsMissingAB, "TestOptDouble()"
    TestLog_ASSERT TestOptDouble(123.4), IsMissingB, "TestOptDouble(123.4)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptDouble(, 567.8), IsMissingA, "TestOptDouble(, 567.8)"
    TestLog_ASSERT TestOptDouble(123.4, 567.8), IsMissingNone, "TestOptDouble(123.4, 567.8)"

    ' optionals with double datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptDoubleByRefByVal(), IsMissingAB, "TestOptDouble()"
    TestLog_ASSERT TestOptDoubleByRefByVal(123.4), IsMissingB, "TestOptDouble(123.4)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptDoubleByRefByVal(, 567.8), IsMissingA, "TestOptDoubleByRefByVal(, 567.8)"
    TestLog_ASSERT TestOptDoubleByRefByVal(123.4, 567.8), IsMissingNone, "TestOptDoubleByRefByVal(123.4, 567.8)"

    ' optionals with integer datatypes
    TestLog_ASSERT TestOptInteger(), IsMissingAB, "TestOptInteger()"
    TestLog_ASSERT TestOptInteger(123), IsMissingB, "TestOptInteger(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptInteger(, 456), IsMissingA, "TestOptInteger(, 456)"
    TestLog_ASSERT TestOptInteger(123, 456), IsMissingNone, "TestOptInteger(123, 456)"

    ' optionals with integer datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptIntegerByRefByVal(), IsMissingAB, "TestOptIntegerByRefByVal()"
    TestLog_ASSERT TestOptIntegerByRefByVal(123), IsMissingB, "TestOptIntegerByRefByVal(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptIntegerByRefByVal(, 456), IsMissingA, "TestOptIntegerByRefByVal(, 456)"
    TestLog_ASSERT TestOptIntegerByRefByVal(123, 456), IsMissingNone, "TestOptIntegerByRefByVal(123, 456)"

    ' optionals with string datatypes
    TestLog_ASSERT TestOptString(), IsMissingAB, "TestOptString()"
    TestLog_ASSERT TestOptString("123"), IsMissingB, "TestOptString(""123"")"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptString(, "456"), IsMissingA, "TestOptString(, ""456"")"
    TestLog_ASSERT TestOptString("123", "456"), IsMissingNone, "TestOptString(""123"", ""456"")"

    ' optionals with string datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptStringByRefByVal(), IsMissingAB, "TestOptStringByRefByVal()"
    TestLog_ASSERT TestOptStringByRefByVal("123"), IsMissingB, "TestOptStringByRefByVal(""123"")"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptStringByRefByVal(, "456"), IsMissingA, "TestOptStringByRefByVal(, ""456"")"
    TestLog_ASSERT TestOptStringByRefByVal("123", "456"), IsMissingNone, "TestOptStringByRefByVal(""123"", ""456"")"

    ' optionals with object datatypes
    Dim cA As New Collection
    cA.Add (123)
    cA.Add (456)
    Dim cB As New Collection
    cB.Add (123.4)
    cB.Add (567.8)
    TestLog_ASSERT TestOptObject(), IsMissingAB, "TestOptObject()"
    TestLog_ASSERT TestOptObject(cA), IsMissingB, "TestOptObject(A)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptObject(, cB), IsMissingA, "TestOptObject(, B)"
    TestLog_ASSERT TestOptObject(cA, cB), IsMissingNone, "TestOptObject(A, B)"

    ' optionals with object datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptObjectByRefByVal(), IsMissingAB, "TestOptObjectByRefByVal()"
    TestLog_ASSERT TestOptObjectByRefByVal(cA), IsMissingB, "TestOptObjectByRefByVal(A)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptObjectByRefByVal(, cB), IsMissingA, "TestOptObjectByRefByVal(, B)"
    TestLog_ASSERT TestOptObjectByRefByVal(cA, cB), IsMissingNone, "TestOptObjectByRefByVal(A, B)"

    ' optionals with array datatypes
    Dim aA(0 To 1) As Integer
    aA(0) = 123
    aA(1) = 456
    Dim aB(0 To 1) As Variant
    aB(0) = 123.4
    aB(1) = 567.8
    TestLog_ASSERT TestOptArray(), IsMissingAB, "TestOptArray()"
    TestLog_ASSERT TestOptArray(aA), IsMissingB, "TestOptArray(A)"
    ' TODO - tdf#125180 for more details
    'TestLog_ASSERT TestOptArray(, aB), IsMissingA, "TestOptArray(, B)"
    TestLog_ASSERT TestOptArray(aA, aB), IsMissingNone, "TestOptArray(A, B)"

    ' optionals with array datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptArrayByRefByVal(), IsMissingAB, "TestOptArrayByRefByVal()"
    TestLog_ASSERT TestOptArrayByRefByVal(aA), IsMissingB, "TestOptArrayByRefByVal(A)"
    ' TODO - tdf#125180 for more details
    'TestLog_ASSERT TestOptArrayByRefByVal(, aB), IsMissingA, "TestOptArrayByRefByVal(, B)"
    TestLog_ASSERT TestOptArrayByRefByVal(aA, aB), IsMissingNone, "TestOptArrayByRefByVal(A, B)"

    result = result & Chr$(10) & "Tests passed: " & passCount & Chr$(10) & "Tests failed: " & failCount & Chr$(10)
    verify_testIsMissingBasic = result

    Exit Function
errorHandler:
    TestLog_ASSERT False, True, Err.Description
End Function

Function TestOptVariant(Optional A, Optional B As Variant)
    TestOptVariant = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptVariantByRefByVal(Optional ByRef A, Optional ByVal B As Variant)
    TestOptVariantByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptDouble(Optional A As Double, Optional B As Double)
    TestOptDouble = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptDoubleByRefByVal(Optional ByRef A As Double, Optional ByVal B As Double)
    TestOptDoubleByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptInteger(Optional A As Integer, Optional B As Integer)
    TestOptInteger = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptIntegerByRefByVal(Optional ByRef A As Integer, Optional ByVal B As Integer)
    TestOptIntegerByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptString(Optional A As String, Optional B As String)
    TestOptString = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptStringByRefByVal(Optional ByRef A As String, Optional ByVal B As String)
    TestOptStringByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptObject(Optional A As Collection, Optional B As Collection)
    TestOptObject = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptObjectByRefByVal(Optional ByRef A As Collection, Optional ByVal B As Collection)
    TestOptObjectByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptArray(Optional A() As Integer, Optional B() As Variant)
    TestOptArray = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptArrayByRefByVal(Optional ByRef A() As Integer, Optional ByVal B() As Variant)
    TestOptArrayByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function WhatIsMissing(is_missingA, is_missingB)
    If is_missingA And is_missingB Then
        WhatIsMissing = IsMissingAB
    ElseIf is_missingA Then
        WhatIsMissing = IsMissingA
    ElseIf is_missingB Then
        WhatIsMissing = IsMissingB
    Else
        WhatIsMissing = IsMissingNone
    End If
End Function

Sub TestLog_ASSERT(actual As Variant, expected As Integer, testName As String)
    If expected = actual Then
        passCount = passCount + 1
    Else
        result = result & Chr$(10) & " Failed: " & testName & " returned " & actual & ", expected " & expected
        failCount = failCount + 1
    End If
End Sub
\ No newline at end of file
diff --git a/basic/qa/basic_coverage/test_ismissing_compatible.vb b/basic/qa/basic_coverage/test_ismissing_compatible.vb
new file mode 100644
index 0000000..13f076d
--- /dev/null
+++ b/basic/qa/basic_coverage/test_ismissing_compatible.vb
@@ -0,0 +1,205 @@
Option Compatible

Dim passCount As Integer
Dim failCount As Integer
Dim result As String

Const IsMissingNone = -1
Const IsMissingA = 0
Const IsMissingB = 1
Const IsMissingAB = 2

Function doUnitTest() As String
    result = verify_testIsMissingCompatible()
    If failCount <> 0 Or passCount = 0 Then
        doUnitTest = 0
    Else
        doUnitTest = 1
    End If
End Function

' tdf#36737 - Test isMissing function with different datatypes. In LO Basic
' with option Compatible, optional parameters are allowed with default values.
' Missing optional parameters that don't have explicit default values will
' not be initialized to their default values of its datatype.
Function verify_testIsMissingCompatible() As String

    passCount = 0
    failCount = 0

    result = "Test Results" & Chr$(10) & "============" & Chr$(10)
    testName = "Test optionals (Basic)"
    On Error GoTo errorHandler

    ' optionals with variant datatypes
    TestLog_ASSERT TestOptVariant(), IsMissingA, "TestOptVariant()"
    TestLog_ASSERT TestOptVariant(123), IsMissingNone, "TestOptVariant(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptVariant(, 456), IsMissingA, "TestOptVariant(, 456)"
    TestLog_ASSERT TestOptVariant(123, 456), IsMissingNone, "TestOptVariant(123, 456)"

    ' optionals with variant datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptVariantByRefByVal(), IsMissingA, "TestOptVariantByRefByVal()"
    TestLog_ASSERT TestOptVariantByRefByVal(123), IsMissingNone, "TestOptVariantByRefByVal(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptVariantByRefByVal(, 456), IsMissingA, "TestOptVariantByRefByVal(, 456)"
    TestLog_ASSERT TestOptVariantByRefByVal(123, 456), IsMissingNone, "TestOptVariantByRefByVal(123, 456)"

    ' optionals with double datatypes
    TestLog_ASSERT TestOptDouble(), IsMissingA, "TestOptDouble()"
    TestLog_ASSERT TestOptDouble(123.4), IsMissingNone, "TestOptDouble(123.4)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptDouble(, 567.8), IsMissingA, "TestOptDouble(, 567.8)"
    TestLog_ASSERT TestOptDouble(123.4, 567.8), IsMissingNone, "TestOptDouble(123.4, 567.8)"

    ' optionals with double datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptDoubleByRefByVal(), IsMissingA, "TestOptDouble()"
    TestLog_ASSERT TestOptDoubleByRefByVal(123.4), IsMissingNone, "TestOptDouble(123.4)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptDoubleByRefByVal(, 567.8), IsMissingA, "TestOptDoubleByRefByVal(, 567.8)"
    TestLog_ASSERT TestOptDoubleByRefByVal(123.4, 567.8), IsMissingNone, "TestOptDoubleByRefByVal(123.4, 567.8)"

    ' optionals with integer datatypes
    TestLog_ASSERT TestOptInteger(), IsMissingA,  "TestOptInteger()"
    TestLog_ASSERT TestOptInteger(123), IsMissingNone, "TestOptInteger(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptInteger(, 456), IsMissingA, "TestOptInteger(, 456)"
    TestLog_ASSERT TestOptInteger(123, 456), IsMissingNone, "TestOptInteger(123, 456)"

    ' optionals with integer datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptIntegerByRefByVal(), IsMissingA, "TestOptIntegerByRefByVal()"
    TestLog_ASSERT TestOptIntegerByRefByVal(123), IsMissingNone, "TestOptIntegerByRefByVal(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptIntegerByRefByVal(, 456), IsMissingA, "TestOptIntegerByRefByVal(, 456)"
    TestLog_ASSERT TestOptIntegerByRefByVal(123, 456), IsMissingNone, "TestOptIntegerByRefByVal(123, 456)"

    ' optionals with string datatypes
    TestLog_ASSERT TestOptString(), IsMissingA, "TestOptString()"
    TestLog_ASSERT TestOptString("123"), IsMissingNone, "TestOptString(""123"")"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptString(, "456"), IsMissingA, "TestOptString(, ""456"")"
    TestLog_ASSERT TestOptString("123", "456"), IsMissingNone, "TestOptString(""123"", ""456"")"

    ' optionals with string datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptStringByRefByVal(), IsMissingA, "TestOptStringByRefByVal()"
    TestLog_ASSERT TestOptStringByRefByVal("123"), IsMissingNone, "TestOptStringByRefByVal(""123"")"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptStringByRefByVal(, "456"), IsMissingA, "TestOptStringByRefByVal(, ""456"")"
    TestLog_ASSERT TestOptStringByRefByVal("123", "456"), IsMissingNone, "TestOptStringByRefByVal(""123"", ""456"")"

    ' optionals with object datatypes
    Dim cA As New Collection
    cA.Add (123)
    cA.Add (456)
    Dim cB As New Collection
    cB.Add (123.4)
    cB.Add (567.8)
    TestLog_ASSERT TestOptObject(), IsMissingAB, "TestOptObject()"
    TestLog_ASSERT TestOptObject(cA), IsMissingB, "TestOptObject(A)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptObject(, cB), IsMissingA, "TestOptObject(, B)"
    TestLog_ASSERT TestOptObject(cA, cB), IsMissingNone, "TestOptObject(A, B)"

    ' optionals with object datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptObjectByRefByVal(), IsMissingAB, "TestOptObjectByRefByVal()"
    TestLog_ASSERT TestOptObjectByRefByVal(cA), IsMissingB, "TestOptObjectByRefByVal(A)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptObjectByRefByVal(, cB), IsMissingA, "TestOptObjectByRefByVal(, B)"
    TestLog_ASSERT TestOptObjectByRefByVal(cA, cB), IsMissingNone, "TestOptObjectByRefByVal(A, B)"

    ' optionals with array datatypes
    Dim aA(0 To 1) As Integer
    aA(0) = 123
    aA(1) = 456
    Dim aB(0 To 1) As Variant
    aB(0) = 123.4
    aB(1) = 567.8
    TestLog_ASSERT TestOptArray(), IsMissingAB, "TestOptArray()"
    TestLog_ASSERT TestOptArray(aA), IsMissingB, "TestOptArray(A)"
    ' TODO - tdf#125180 for more details
    'TestLog_ASSERT TestOptArray(, aB), IsMissingA, "TestOptArray(, B)"
    TestLog_ASSERT TestOptArray(aA, aB), IsMissingNone, "TestOptArray(A, B)"

    ' optionals with array datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptArrayByRefByVal(), IsMissingAB, "TestOptArrayByRefByVal()"
    TestLog_ASSERT TestOptArrayByRefByVal(aA), IsMissingB, "TestOptArrayByRefByVal(A)"
    ' TODO - tdf#125180 for more details
    'TestLog_ASSERT TestOptArrayByRefByVal(, aB), IsMissingA, "TestOptArrayByRefByVal(, B)"
    TestLog_ASSERT TestOptArrayByRefByVal(aA, aB), IsMissingNone, "TestOptArrayByRefByVal(A, B)"

    result = result & Chr$(10) & "Tests passed: " & passCount & Chr$(10) & "Tests failed: " & failCount & Chr$(10)
    verify_testIsMissingCompatible = result

    Exit Function
errorHandler:
    TestLog_ASSERT False, True, Err.Description
End Function

Function TestOptVariant(Optional A, Optional B As Variant = 123)
    TestOptVariant = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptVariantByRefByVal(Optional ByRef A, Optional ByVal B As Variant = 123)
    TestOptVariantByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptDouble(Optional A As Double, Optional B As Double = 123.4)
    TestOptDouble = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptDoubleByRefByVal(Optional ByRef A As Double, Optional ByVal B As Double = 123.4)
    TestOptDoubleByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptInteger(Optional A As Integer, Optional B As Integer = 123)
    TestOptInteger = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptIntegerByRefByVal(Optional ByRef A As Integer, Optional ByVal B As Integer = 123)
    TestOptIntegerByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptString(Optional A As String, Optional B As String = "123")
    TestOptString = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptStringByRefByVal(Optional ByRef A As String, Optional ByVal B As String = "123")
    TestOptStringByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptObject(Optional A As Collection, Optional B As Collection)
    TestOptObject = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptObjectByRefByVal(Optional ByRef A As Collection, Optional ByVal B As Collection)
    TestOptObjectByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptArray(Optional A() As Integer, Optional B() As Variant)
    TestOptArray = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptArrayByRefByVal(Optional ByRef A() As Integer, Optional ByVal B() As Variant)
    TestOptArrayByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function WhatIsMissing(is_missingA, is_missingB)
    If is_missingA And is_missingB Then
        WhatIsMissing = IsMissingAB
    ElseIf is_missingA Then
        WhatIsMissing = IsMissingA
    ElseIf is_missingB Then
        WhatIsMissing = IsMissingB
    Else
        WhatIsMissing = IsMissingNone
    End If
End Function

Sub TestLog_ASSERT(actual As Variant, expected As Variant, testName As String)
    If expected = actual Then
        passCount = passCount + 1
    Else
        result = result & Chr$(10) & " Failed: " & testName & " returned " & actual & ", expected " & expected
        failCount = failCount + 1
    End If
End Sub
\ No newline at end of file
diff --git a/basic/qa/basic_coverage/test_optional_paramters_basic.vb b/basic/qa/basic_coverage/test_optional_paramters_basic.vb
new file mode 100644
index 0000000..d260246
--- /dev/null
+++ b/basic/qa/basic_coverage/test_optional_paramters_basic.vb
@@ -0,0 +1,220 @@
Dim passCount As Integer
Dim failCount As Integer
Dim result As String

Function doUnitTest() As String
    result = verify_testOptionalsBasic()
    If failCount <> 0 Or passCount = 0 Then
        doUnitTest = 0
    Else
        doUnitTest = 1
    End If
End Function

' tdf#36737 - Test optionals with different datatypes. In LO Basic, optional
' parameters are allowed, but without any default values. Missing optional
' parameters will not be initialized to their respective default values of
' its datatype, either.
Function verify_testOptionalsBasic() As String

    passCount = 0
    failCount = 0

    result = "Test Results" & Chr$(10) & "============" & Chr$(10)
    testName = "Test optionals (Basic)"
    On Error GoTo errorHandler

    ' optionals with variant datatypes
    TestLog_ASSERT TestOptVariant(), 0, "TestOptVariant()"
    TestLog_ASSERT TestOptVariant(123), 123, "TestOptVariant(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptVariant(, 456), 456, "TestOptVariant(, 456)"
    TestLog_ASSERT TestOptVariant(123, 456), 579, "TestOptVariant(123, 456)"

    ' optionals with variant datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptVariantByRefByVal(), 0, "TestOptVariantByRefByVal()"
    TestLog_ASSERT TestOptVariantByRefByVal(123), 123, "TestOptVariantByRefByVal(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptVariantByRefByVal(, 456), 456, "TestOptVariantByRefByVal(, 456)"
    TestLog_ASSERT TestOptVariantByRefByVal(123, 456), 579, "TestOptVariantByRefByVal(123, 456)"

    ' optionals with double datatypes
    TestLog_ASSERT TestOptDouble(), 0, "TestOptDouble()"
    TestLog_ASSERT TestOptDouble(123.4), 123.4, "TestOptDouble(123.4)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptDouble(, 567.8), 567.8, "TestOptDouble(, 567.8)"
    TestLog_ASSERT Format(TestOptDouble(123.4, 567.8), "0.0"), 691.2, "TestOptDouble(123.4, 567.8)"

    ' optionals with double datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptDoubleByRefByVal(), 0, "TestOptDouble()"
    TestLog_ASSERT TestOptDoubleByRefByVal(123.4), 123.4, "TestOptDouble(123.4)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptDoubleByRefByVal(, 567.8), 567.8, "TestOptDoubleByRefByVal(, 567.8)"
    TestLog_ASSERT Format(TestOptDoubleByRefByVal(123.4, 567.8), "0.0"), 691.2, "TestOptDoubleByRefByVal(123.4, 567.8)"

    ' optionals with integer datatypes
    TestLog_ASSERT TestOptInteger(), 0, "TestOptInteger()"
    TestLog_ASSERT TestOptInteger(123), 123, "TestOptInteger(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptInteger(, 456), 456, "TestOptInteger(, 456)"
    TestLog_ASSERT TestOptInteger(123, 456), 579, "TestOptInteger(123, 456)"

    ' optionals with integer datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptIntegerByRefByVal(), 0, "TestOptIntegerByRefByVal()"
    TestLog_ASSERT TestOptIntegerByRefByVal(123), 123, "TestOptIntegerByRefByVal(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptIntegerByRefByVal(, 456), 456, "TestOptIntegerByRefByVal(, 456)"
    TestLog_ASSERT TestOptIntegerByRefByVal(123, 456), 579, "TestOptIntegerByRefByVal(123, 456)"

    ' optionals with string datatypes
    TestLog_ASSERT TestOptString(), "", "TestOptString()"
    TestLog_ASSERT TestOptString("123"), "123", "TestOptString(""123"")"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptString(, "456"), "456", "TestOptString(, ""456"")"
    TestLog_ASSERT TestOptString("123", "456"), "123456", "TestOptString(""123"", ""456"")"

    ' optionals with string datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptStringByRefByVal(), "", "TestOptStringByRefByVal()"
    TestLog_ASSERT TestOptStringByRefByVal("123"), "123", "TestOptStringByRefByVal(""123"")"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptStringByRefByVal(, "456"), "456", "TestOptStringByRefByVal(, ""456"")"
    TestLog_ASSERT TestOptStringByRefByVal("123", "456"), "123456", "TestOptStringByRefByVal(""123"", ""456"")"

    ' optionals with object datatypes
    Dim cA As New Collection
    cA.Add (123)
    cA.Add (456)
    Dim cB As New Collection
    cB.Add (123.4)
    cB.Add (567.8)
    TestLog_ASSERT TestOptObject(), 0, "TestOptObject()"
    TestLog_ASSERT TestOptObject(cA), 579, "TestOptObject(A)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT Format(TestOptObject(, cB), "0.0"), 691.2, "TestOptObject(, B)"
    TestLog_ASSERT Format(TestOptObject(cA, cB), "0.0"), 1270.2, "TestOptObject(A, B)"

    ' optionals with object datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptObjectByRefByVal(), 0, "TestOptObjectByRefByVal()"
    TestLog_ASSERT TestOptObjectByRefByVal(cA), 579, "TestOptObjectByRefByVal(A)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT Format(TestOptObjectByRefByVal(, cB), "0.0"), 691.2, "TestOptObjectByRefByVal(, B)"
    TestLog_ASSERT Format(TestOptObjectByRefByVal(cA, cB), "0.0"), 1270.2, "TestOptObjectByRefByVal(A, B)"

    ' optionals with array datatypes
    Dim aA(0 To 1) As Integer
    aA(0) = 123
    aA(1) = 456
    Dim aB(0 To 1) As Variant
    aB(0) = 123.4
    aB(1) = 567.8
    TestLog_ASSERT TestOptArray(), 0, "TestOptArray()"
    TestLog_ASSERT TestOptArray(aA), 579, "TestOptArray(A)"
    ' TODO - tdf#125180 for more details
    'TestLog_ASSERT Format(TestOptArray(, aB), "0.0"), 691.2, "TestOptArray(, B)"
    TestLog_ASSERT Format(TestOptArray(aA, aB), "0.0"), 1270.2, "TestOptArray(A, B)"

    ' optionals with array datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptArrayByRefByVal(), 0, "TestOptArrayByRefByVal()"
    TestLog_ASSERT TestOptArrayByRefByVal(aA), 579, "TestOptArrayByRefByVal(A)"
    ' TODO - tdf#125180 for more details
    'TestLog_ASSERT Format(TestOptArrayByRefByVal(, aB), "0.0"), 691.2, "TestOptArrayByRefByVal(, B)"
    TestLog_ASSERT Format(TestOptArrayByRefByVal(aA, aB), "0.0"), 1270.2, "TestOptArrayByRefByVal(A, B)"

    result = result & Chr$(10) & "Tests passed: " & passCount & Chr$(10) & "Tests failed: " & failCount & Chr$(10)
    verify_testOptionalsBasic = result

    Exit Function
errorHandler:
    TestLog_ASSERT False, True, Err.Description
End Function

Function TestOptVariant(Optional A, Optional B As Variant)
    TestOptVariant = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptVariantByRefByVal(Optional ByRef A, Optional ByVal B As Variant)
    TestOptVariantByRefByVal = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptDouble(Optional A As Double, Optional B As Double)
    TestOptDouble = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptDoubleByRefByVal(Optional ByRef A As Double, Optional ByVal B As Double)
    TestOptDoubleByRefByVal = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptInteger(Optional A As Integer, Optional B As Integer)
    TestOptInteger = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptIntegerByRefByVal(Optional ByRef A As Integer, Optional ByVal B As Integer)
    TestOptIntegerByRefByVal = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptString(Optional A As String, Optional B As String)
    TestOptString = OptStringConcat(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptStringByRefByVal(Optional ByRef A As String, Optional ByVal B As String)
    TestOptStringByRefByVal = OptStringConcat(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptObject(Optional A As Collection, Optional B As Collection)
    TestOptObject = 0
    If Not IsMissing(A) Then TestOptObject = CollectionSum(A)
    If Not IsMissing(B) Then TestOptObject = TestOptObject + CollectionSum(B)
End Function

Function TestOptObjectByRefByVal(Optional ByRef A As Collection, Optional ByVal B As Collection)
    TestOptObjectByRefByVal = 0
    If Not IsMissing(A) Then TestOptObjectByRefByVal = CollectionSum(A)
    If Not IsMissing(B) Then TestOptObjectByRefByVal = TestOptObjectByRefByVal + CollectionSum(B)
End Function

Function TestOptArray(Optional A() As Integer, Optional B() As Variant)
    TestOptArray = ArraySum(IsMissing(A), A) + ArraySum(IsMissing(B), B)
End Function

Function TestOptArrayByRefByVal(Optional ByRef A() As Integer, Optional ByVal B() As Variant)
    TestOptArrayByRefByVal = ArraySum(IsMissing(A), A) + ArraySum(IsMissing(B), B)
End Function

Function OptNumberSum(is_missingA As Boolean, A, is_missingB As Boolean, B)
    OptNumberSum = 0
    If Not is_missingA Then OptNumberSum = A
    If Not is_missingB Then OptNumberSum = OptNumberSum + B
End Function

Function OptStringConcat(is_missingA As Boolean, A, is_missingB As Boolean, B)
    OptStringConcat = ""
    If Not is_missingA Then OptStringConcat = A
    If Not is_missingB Then OptStringConcat = OptStringConcat & B
End Function

Function CollectionSum(C)
    Dim idx As Integer
    CollectionSum = 0
    For idx = 1 To C.Count
        CollectionSum = CollectionSum + C.Item(idx)
    Next idx
End Function

Function ArraySum(is_missingC As Boolean, C)
    Dim idx As Integer
    ArraySum = 0
    If Not is_missingC Then
        For idx = LBound(C) To UBound(C)
            ArraySum = ArraySum + C(idx)
        Next idx
    End If
End Function

Sub TestLog_ASSERT(actual As Variant, expected As Variant, testName As String)
    If expected = actual Then
        passCount = passCount + 1
    Else
        result = result & Chr$(10) & " Failed: " & testName & " returned " & actual & ", expected " & expected
        failCount = failCount + 1
    End If
End Sub
\ No newline at end of file
diff --git a/basic/qa/basic_coverage/test_optional_paramters_compatible.vb b/basic/qa/basic_coverage/test_optional_paramters_compatible.vb
new file mode 100644
index 0000000..5cbaeab
--- /dev/null
+++ b/basic/qa/basic_coverage/test_optional_paramters_compatible.vb
@@ -0,0 +1,224 @@
Option Compatible

Dim passCount As Integer
Dim failCount As Integer
Dim result As String

Function doUnitTest() As String
    result = verify_testOptionalsCompatible()
    If failCount <> 0 Or passCount = 0 Then
        doUnitTest = 0
    Else
        doUnitTest = 1
    End If
End Function

' tdf#36737 - Test optionals with different datatypes. In LO Basic
' with option Compatible, optional parameters are allowed with default values.
' Missing optional parameters that don't have explicit default values will
' not be initialized to their default values of its datatype.
Function verify_testOptionalsCompatible() As String

    passCount = 0
    failCount = 0

    result = "Test Results" & Chr$(10) & "============" & Chr$(10)
    testName = "Test optionals (Basic)"
    On Error GoTo errorHandler

    ' optionals with variant datatypes
    ' TODO - New bug report? Scanner initializes variable as String. Function returns "123"
    ' TestLog_ASSERT TestOptVariant(), 123, "TestOptVariant()"
    TestLog_ASSERT TestOptVariant(123), 246, "TestOptVariant(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptVariant(, 456), 456, "TestOptVariant(, 456)"
    TestLog_ASSERT TestOptVariant(123, 456), 579, "TestOptVariant(123, 456)"

    ' optionals with variant datatypes (ByRef and ByVal)
    ' TODO - New bug report? Scanner initializes variable as String. Function returns "123"
    ' TestLog_ASSERT TestOptVariantByRefByVal(), 123, "TestOptVariantByRefByVal()"
    TestLog_ASSERT TestOptVariantByRefByVal(123), 246, "TestOptVariantByRefByVal(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptVariantByRefByVal(, 456), 456, "TestOptVariantByRefByVal(, 456)"
    TestLog_ASSERT TestOptVariantByRefByVal(123, 456), 579, "TestOptVariantByRefByVal(123, 456)"

    ' optionals with double datatypes
    TestLog_ASSERT TestOptDouble(), 123.4, "TestOptDouble()"
    TestLog_ASSERT TestOptDouble(123.4), 246.8, "TestOptDouble(123.4)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptDouble(, 567.8), 567.8, "TestOptDouble(, 567.8)"
    TestLog_ASSERT Format(TestOptDouble(123.4, 567.8), "0.0"), 691.2, "TestOptDouble(123.4, 567.8)"

    ' optionals with double datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptDoubleByRefByVal(), 123.4, "TestOptDouble()"
    TestLog_ASSERT TestOptDoubleByRefByVal(123.4), 246.8, "TestOptDouble(123.4)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptDoubleByRefByVal(, 567.8), 567.8, "TestOptDoubleByRefByVal(, 567.8)"
    TestLog_ASSERT Format(TestOptDoubleByRefByVal(123.4, 567.8), "0.0"), 691.2, "TestOptDoubleByRefByVal(123.4, 567.8)"

    ' optionals with integer datatypes
    TestLog_ASSERT TestOptInteger(), 123, "TestOptInteger()"
    TestLog_ASSERT TestOptInteger(123), 246, "TestOptInteger(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptInteger(, 456), 456, "TestOptInteger(, 456)"
    TestLog_ASSERT TestOptInteger(123, 456), 579, "TestOptInteger(123, 456)"

    ' optionals with integer datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptIntegerByRefByVal(), 123, "TestOptIntegerByRefByVal()"
    TestLog_ASSERT TestOptIntegerByRefByVal(123), 246, "TestOptIntegerByRefByVal(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptIntegerByRefByVal(, 456), 456, "TestOptIntegerByRefByVal(, 456)"
    TestLog_ASSERT TestOptIntegerByRefByVal(123, 456), 579, "TestOptIntegerByRefByVal(123, 456)"

    ' optionals with string datatypes
    TestLog_ASSERT TestOptString(), "123", "TestOptString()"
    TestLog_ASSERT TestOptString("123"), "123123", "TestOptString(""123"")"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptString(, "456"), "456", "TestOptString(, ""456"")"
    TestLog_ASSERT TestOptString("123", "456"), "123456", "TestOptString(""123"", ""456"")"

    ' optionals with string datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptStringByRefByVal(), "123", "TestOptStringByRefByVal()"
    TestLog_ASSERT TestOptStringByRefByVal("123"), "123123", "TestOptStringByRefByVal(""123"")"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptStringByRefByVal(, "456"), "456", "TestOptStringByRefByVal(, ""456"")"
    TestLog_ASSERT TestOptStringByRefByVal("123", "456"), "123456", "TestOptStringByRefByVal(""123"", ""456"")"

    ' optionals with object datatypes
    Dim cA As New Collection
    cA.Add (123)
    cA.Add (456)
    Dim cB As New Collection
    cB.Add (123.4)
    cB.Add (567.8)
    TestLog_ASSERT TestOptObject(), 0, "TestOptObject()"
    TestLog_ASSERT TestOptObject(cA), 579, "TestOptObject(A)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT Format(TestOptObject(, cB), "0.0"), 691.2, "TestOptObject(, B)"
    TestLog_ASSERT Format(TestOptObject(cA, cB), "0.0"), 1270.2, "TestOptObject(A, B)"

    ' optionals with object datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptObjectByRefByVal(), 0, "TestOptObjectByRefByVal()"
    TestLog_ASSERT TestOptObjectByRefByVal(cA), 579, "TestOptObjectByRefByVal(A)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT Format(TestOptObjectByRefByVal(, cB), "0.0"), 691.2, "TestOptObjectByRefByVal(, B)"
    TestLog_ASSERT Format(TestOptObjectByRefByVal(cA, cB), "0.0"), 1270.2, "TestOptObjectByRefByVal(A, B)"

    ' optionals with array datatypes
    Dim aA(0 To 1) As Integer
    aA(0) = 123
    aA(1) = 456
    Dim aB(0 To 1) As Variant
    aB(0) = 123.4
    aB(1) = 567.8
    TestLog_ASSERT TestOptArray(), 0, "TestOptArray()"
    TestLog_ASSERT TestOptArray(aA), 579, "TestOptArray(A)"
    ' TODO - tdf#125180 for more details
    'TestLog_ASSERT Format(TestOptArray(, aB), "0.0"), 691.2, "TestOptArray(, B)"
    TestLog_ASSERT Format(TestOptArray(aA, aB), "0.0"), 1270.2, "TestOptArray(A, B)"

    ' optionals with array datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptArrayByRefByVal(), 0, "TestOptArrayByRefByVal()"
    TestLog_ASSERT TestOptArrayByRefByVal(aA), 579, "TestOptArrayByRefByVal(A)"
    ' TODO - tdf#125180 for more details
    'TestLog_ASSERT Format(TestOptArrayByRefByVal(, aB), "0.0"), 691.2, "TestOptArrayByRefByVal(, B)"
    TestLog_ASSERT Format(TestOptArrayByRefByVal(aA, aB), "0.0"), 1270.2, "TestOptArrayByRefByVal(A, B)"

    result = result & Chr$(10) & "Tests passed: " & passCount & Chr$(10) & "Tests failed: " & failCount & Chr$(10)
    verify_testOptionalsCompatible = result

    Exit Function
errorHandler:
    TestLog_ASSERT False, True, Err.Description
End Function

Function TestOptVariant(Optional A, Optional B As Variant = 123)
    TestOptVariant = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptVariantByRefByVal(Optional ByRef A, Optional ByVal B As Variant = 123)
    TestOptVariantByRefByVal = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptDouble(Optional A As Double, Optional B As Double = 123.4)
    TestOptDouble = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptDoubleByRefByVal(Optional ByRef A As Double, Optional ByVal B As Double = 123.4)
    TestOptDoubleByRefByVal = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptInteger(Optional A As Integer, Optional B As Integer = 123)
    TestOptInteger = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptIntegerByRefByVal(Optional ByRef A As Integer, Optional ByVal B As Integer = 123)
    TestOptIntegerByRefByVal = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptString(Optional A As String, Optional B As String = "123")
    TestOptString = OptStringConcat(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptStringByRefByVal(Optional ByRef A As String, Optional ByVal B As String = "123")
    TestOptStringByRefByVal = OptStringConcat(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptObject(Optional A As Collection, Optional B As Collection)
    TestOptObject = 0
    If Not IsMissing(A) Then TestOptObject = CollectionSum(A)
    If Not IsMissing(B) Then TestOptObject = TestOptObject + CollectionSum(B)
End Function

Function TestOptObjectByRefByVal(Optional ByRef A As Collection, Optional ByVal B As Collection)
    TestOptObjectByRefByVal = 0
    If Not IsMissing(A) Then TestOptObjectByRefByVal = CollectionSum(A)
    If Not IsMissing(B) Then TestOptObjectByRefByVal = TestOptObjectByRefByVal + CollectionSum(B)
End Function

Function TestOptArray(Optional A() As Integer, Optional B() As Variant)
    TestOptArray = ArraySum(IsMissing(A), A) + ArraySum(IsMissing(B), B)
End Function

Function TestOptArrayByRefByVal(Optional ByRef A() As Integer, Optional ByVal B() As Variant)
    TestOptArrayByRefByVal = ArraySum(IsMissing(A), A) + ArraySum(IsMissing(B), B)
End Function

Function OptNumberSum(is_missingA As Boolean, A, is_missingB As Boolean, B)
    OptNumberSum = 0
    If Not is_missingA Then OptNumberSum = A
    If Not is_missingB Then OptNumberSum = OptNumberSum + B
End Function

Function OptStringConcat(is_missingA As Boolean, A, is_missingB As Boolean, B)
    OptStringConcat = ""
    If Not is_missingA Then OptStringConcat = A
    If Not is_missingB Then OptStringConcat = OptStringConcat & B
End Function

Function CollectionSum(C)
    Dim idx As Integer
    CollectionSum = 0
    For idx = 1 To C.Count
        CollectionSum = CollectionSum + C.Item(idx)
    Next idx
End Function

Function ArraySum(is_missingC As Boolean, C)
    Dim idx As Integer
    ArraySum = 0
    If Not is_missingC Then
        For idx = LBound(C) To UBound(C)
            ArraySum = ArraySum + C(idx)
        Next idx
    End If
End Function

Sub TestLog_ASSERT(actual As Variant, expected As Variant, testName As String)
    If expected = actual Then
        passCount = passCount + 1
    Else
        result = result & Chr$(10) & " Failed: " & testName & " returned " & actual & ", expected " & expected
        failCount = failCount + 1
    End If
End Sub
\ No newline at end of file
diff --git a/basic/qa/cppunit/test_vba.cxx b/basic/qa/cppunit/test_vba.cxx
index 74c9752..fd0bdb1 100644
--- a/basic/qa/cppunit/test_vba.cxx
+++ b/basic/qa/cppunit/test_vba.cxx
@@ -113,6 +113,7 @@ void VBATest::testMiscVBAFunctions()
        "month.vb",
        "monthname.vb",
        "oct.vb",
        "optional_paramters.vb",
        "qbcolor.vb",
        "rgb.vb",
        "rtrim.vb",
diff --git a/basic/qa/vba_tests/ismissing.vb b/basic/qa/vba_tests/ismissing.vb
index 496a57a..1adc734 100644
--- a/basic/qa/vba_tests/ismissing.vb
+++ b/basic/qa/vba_tests/ismissing.vb
@@ -1,72 +1,210 @@
Option VBASupport 1
Option Explicit

Dim passCount As Integer
Dim failCount As Integer
Dim result As String

Const IsMissingNone = -1
Const IsMissingA = 0
Const IsMissingB = 1
Const IsMissingAB = 2

Function doUnitTest() As String
result = verify_testIsMissing()
If failCount <> 0 Or passCount = 0 Then
    doUnitTest = result
Else
    doUnitTest = "OK"
End If
    result = verify_testIsMissingVba()
    If failCount <> 0 Or passCount = 0 Then
        doUnitTest = result
    Else
        doUnitTest = "OK"
    End If
End Function



Function verify_testIsMissing() As String
' tdf#36737 - Test isMissing function with different datatypes. In LO Basic
' with option VBASupport, optional parameters are allowed including additional
' default values. Missing optional parameters having types other than variant,
' which don't have explicit default values, will be initialized to their
' respective default value of its datatype.
Function verify_testIsMissingVba() As String

    passCount = 0
    failCount = 0

    result = "Test Results" & Chr$(10) & "============" & Chr$(10)

    Dim testName As String
    Dim num1, num2 As Integer
    testName = "Test IsMissing function"
    testName = "Test optionals (Basic)"
    On Error GoTo errorHandler

    num1 = ReturnTwice()
    TestLog_ASSERT IsNull(num1)
    ' optionals with variant datatypes
    TestLog_ASSERT TestOptVariant(), IsMissingA, "TestOptVariant()"
    TestLog_ASSERT TestOptVariant(123), IsMissingNone, "TestOptVariant(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptVariant(, 456), IsMissingNone, "TestOptVariant(, 456)"
    TestLog_ASSERT TestOptVariant(123, 456), IsMissingNone, "TestOptVariant(123, 456)"

    num2 = 4
    num1 = ReturnTwice(2)
    TestLog_ASSERT num1 = num2, "the return IsMissing is: " & num1
    ' optionals with variant datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptVariantByRefByVal(), IsMissingA, "TestOptVariantByRefByVal()"
    TestLog_ASSERT TestOptVariantByRefByVal(123),IsMissingNone, "TestOptVariantByRefByVal(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptVariantByRefByVal(, 456), IsMissingNone, "TestOptVariantByRefByVal(, 456)"
    TestLog_ASSERT TestOptVariantByRefByVal(123, 456), IsMissingNone, "TestOptVariantByRefByVal(123, 456)"

    ' optionals with double datatypes
    TestLog_ASSERT TestOptDouble(), IsMissingNone, "TestOptDouble()"
    TestLog_ASSERT TestOptDouble(123.4), IsMissingNone, "TestOptDouble(123.4)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptDouble(, 567.8), IsMissingNone, "TestOptDouble(, 567.8)"
    TestLog_ASSERT TestOptDouble(123.4, 567.8), IsMissingNone, "TestOptDouble(123.4, 567.8)"

    ' optionals with double datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptDoubleByRefByVal(), IsMissingNone, "TestOptDouble()"
    TestLog_ASSERT TestOptDoubleByRefByVal(123.4), IsMissingNone, "TestOptDouble(123.4)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptDoubleByRefByVal(, 567.8), IsMissingNone, "TestOptDoubleByRefByVal(, 567.8)"
    TestLog_ASSERT TestOptDoubleByRefByVal(123.4, 567.8), IsMissingNone, "TestOptDoubleByRefByVal(123.4, 567.8)"

    ' optionals with integer datatypes
    TestLog_ASSERT TestOptInteger(), IsMissingNone, "TestOptInteger()"
    TestLog_ASSERT TestOptInteger(123), IsMissingNone, "TestOptInteger(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptInteger(, 456), IsMissingNone, "TestOptInteger(, 456)"
    TestLog_ASSERT TestOptInteger(123, 456), IsMissingNone, "TestOptInteger(123, 456)"

    ' optionals with integer datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptIntegerByRefByVal(), IsMissingNone, "TestOptIntegerByRefByVal()"
    TestLog_ASSERT TestOptIntegerByRefByVal(123), IsMissingNone, "TestOptIntegerByRefByVal(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptIntegerByRefByVal(, 456), IsMissingNone, "TestOptIntegerByRefByVal(, 456)"
    TestLog_ASSERT TestOptIntegerByRefByVal(123, 456), IsMissingNone, "TestOptIntegerByRefByVal(123, 456)"

    ' optionals with string datatypes
    TestLog_ASSERT TestOptString(), IsMissingNone, "TestOptString()"
    TestLog_ASSERT TestOptString("123"), IsMissingNone, "TestOptString(""123"")"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptString(, "456"), IsMissingNone, "TestOptString(, ""456"")"
    TestLog_ASSERT TestOptString("123", "456"), IsMissingNone, "TestOptString(""123"", ""456"")"

    ' optionals with string datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptStringByRefByVal(), IsMissingNone, "TestOptStringByRefByVal()"
    TestLog_ASSERT TestOptStringByRefByVal("123"), IsMissingNone, "TestOptStringByRefByVal(""123"")"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptStringByRefByVal(, "456"), IsMissingNone, "TestOptStringByRefByVal(, ""456"")"
    TestLog_ASSERT TestOptStringByRefByVal("123", "456"), IsMissingNone, "TestOptStringByRefByVal(""123"", ""456"")"

    ' optionals with object datatypes
    Dim cA As New Collection
    cA.Add (123)
    cA.Add (456)
    Dim cB As New Collection
    cB.Add (123.4)
    cB.Add (567.8)
    TestLog_ASSERT TestOptObject(), IsMissingAB, "TestOptObject()"
    TestLog_ASSERT TestOptObject(cA), IsMissingB, "TestOptObject(A)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptObject(, cB), IsMissingA, "TestOptObject(, B)"
    TestLog_ASSERT TestOptObject(cA, cB), IsMissingNone, "TestOptObject(A, B)"

    ' optionals with object datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptObjectByRefByVal(), IsMissingAB, "TestOptObjectByRefByVal()"
    TestLog_ASSERT TestOptObjectByRefByVal(cA), IsMissingB, "TestOptObjectByRefByVal(A)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptObjectByRefByVal(, cB), IsMissingA, "TestOptObjectByRefByVal(, B)"
    TestLog_ASSERT TestOptObjectByRefByVal(cA, cB), IsMissingNone, "TestOptObjectByRefByVal(A, B)"

    ' optionals with array datatypes
    Dim aA(0 To 1) As Integer
    aA(0) = 123
    aA(1) = 456
    Dim aB(0 To 1) As Variant
    aB(0) = 123.4
    aB(1) = 567.8
    ' TODO - New bug report? Scanner initializes variable not as an array
    ' TestLog_ASSERT TestOptArray(), IsMissingAB, "TestOptArray()"
    ' TestLog_ASSERT TestOptArray(aA), IsMissingB, "TestOptArray(A)"

    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptArray(, aB), IsMissingA, "TestOptArray(, B)"
    TestLog_ASSERT TestOptArray(aA, aB), IsMissingNone, "TestOptArray(A, B)"

    ' optionals with array datatypes (ByRef and ByVal)
    ' TODO - New bug report? Scanner initializes variable not as an array
    ' TestLog_ASSERT TestOptArrayByRefByVal(), IsMissingAB, "TestOptArrayByRefByVal()"
    ' TestLog_ASSERT TestOptArrayByRefByVal(aA), IsMissingB, "TestOptArrayByRefByVal(A)"

    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptArrayByRefByVal(, aB), IsMissingA, "TestOptArrayByRefByVal(, B)"
    TestLog_ASSERT TestOptArrayByRefByVal(aA, aB), IsMissingNone, "TestOptArrayByRefByVal(A, B)"

    result = result & Chr$(10) & "Tests passed: " & passCount & Chr$(10) & "Tests failed: " & failCount & Chr$(10)
    verify_testIsMissing = result
    verify_testIsMissingVba = result

    Exit Function
errorHandler:
        TestLog_ASSERT (False), testName & ": hit error handler"
    TestLog_ASSERT False, True, Err.Description
End Function

Sub TestLog_ASSERT(assertion As Boolean, Optional testId As String, Optional testComment As String)
Function TestOptVariant(Optional A, Optional B As Variant = 123)
    TestOptVariant = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

    If assertion = True Then
Function TestOptVariantByRefByVal(Optional ByRef A, Optional ByVal B As Variant = 123)
    TestOptVariantByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptDouble(Optional A As Double, Optional B As Double = 123.4)
    TestOptDouble = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptDoubleByRefByVal(Optional ByRef A As Double, Optional ByVal B As Double = 123.4)
    TestOptDoubleByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptInteger(Optional A As Integer, Optional B As Integer = 123)
    TestOptInteger = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptIntegerByRefByVal(Optional ByRef A As Integer, Optional ByVal B As Integer = 123)
    TestOptIntegerByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptString(Optional A As String, Optional B As String = "123")
    TestOptString = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptStringByRefByVal(Optional ByRef A As String, Optional ByVal B As String = "123")
    TestOptStringByRefByVal = WhatIsMissing(IsMissing(A), IsMissing(B))
End Function

Function TestOptObject(Optional A As Collection, Optional B As Collection)
    TestOptObject = WhatIsMissing(IsNull(A), IsNull(B))
End Function

Function TestOptObjectByRefByVal(Optional ByRef A As Collection, Optional ByVal B As Collection)
    TestOptObjectByRefByVal = WhatIsMissing(IsNull(A), IsNull(B))
End Function

Function TestOptArray(Optional A() As Integer, Optional B() As Variant)
    TestOptArray = WhatIsMissing(IsEmpty(A), IsEmpty(B))
End Function

Function TestOptArrayByRefByVal(Optional ByRef A() As Integer, Optional ByVal B() As Variant)
    TestOptArrayByRefByVal = WhatIsMissing(IsEmpty(A), IsEmpty(B))
End Function

Function WhatIsMissing(is_missingA, is_missingB)
    If is_missingA And is_missingB Then
        WhatIsMissing = IsMissingAB
    ElseIf is_missingA Then
        WhatIsMissing = IsMissingA
    ElseIf is_missingB Then
        WhatIsMissing = IsMissingB
    Else
        WhatIsMissing = IsMissingNone
    End If
End Function

Sub TestLog_ASSERT(actual As Variant, expected As Integer, testName As String)
    If expected = actual Then
        passCount = passCount + 1
    Else
        Dim testMsg As String
        If Not IsMissing(testId) Then
            testMsg = testMsg + " : " + testId
        End If
        If Not IsMissing(testComment) And Not (testComment = "") Then
            testMsg = testMsg + " (" + testComment + ")"
        End If

        result = result & Chr$(10) & " Failed: " & testMsg
        result = result & Chr$(10) & " Failed: " & testName & " returned " & actual & ", expected " & expected
        failCount = failCount + 1
    End If

End Sub
' Function procedure definition.
Function ReturnTwice(Optional A)
    If IsMissing(A) Then
        ' If argument is missing, return a Null.
        ReturnTwice = Null
    Else
        ' If argument is present, return twice the value.
        ReturnTwice = A * 2
    End If
End Function
End Sub
\ No newline at end of file
diff --git a/basic/qa/vba_tests/optional_paramters.vb b/basic/qa/vba_tests/optional_paramters.vb
new file mode 100644
index 0000000..eff8275
--- /dev/null
+++ b/basic/qa/vba_tests/optional_paramters.vb
@@ -0,0 +1,231 @@
Option VBASupport 1

Dim passCount As Integer
Dim failCount As Integer
Dim result As String

Function doUnitTest() As String
    result = verify_testOptionalsVba()
    If failCount <> 0 Or passCount = 0 Then
        doUnitTest = result
    Else
        doUnitTest = "OK"
    End If
End Function

' tdf#36737 - Test optionals with different datatypes. In LO Basic
' with option VBASupport, optional parameters are allowed including additional
' default values. Missing optional parameters having types other than variant,
' which don't have explicit default values, will be initialized to their
' respective default value of its datatype
Function verify_testOptionalsVba() As String

    passCount = 0
    failCount = 0

    result = "Test Results" & Chr$(10) & "============" & Chr$(10)
    testName = "Test optionals (Basic)"
    On Error GoTo errorHandler

    ' optionals with variant datatypes
    ' TODO - New bug report? Scanner initializes variable as String. Function returns "123"
    ' TestLog_ASSERT TestOptVariant(), 123, "TestOptVariant()"
    TestLog_ASSERT TestOptVariant(123), 246, "TestOptVariant(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptVariant(, 456), 456, "TestOptVariant(, 456)"
    TestLog_ASSERT TestOptVariant(123, 456), 579, "TestOptVariant(123, 456)"

    ' optionals with variant datatypes (ByRef and ByVal)
    ' TODO - New bug report? Scanner initializes variable as String. Function returns "123"
    ' TestLog_ASSERT TestOptVariantByRefByVal(), 123, "TestOptVariantByRefByVal()"
    TestLog_ASSERT TestOptVariantByRefByVal(123), 246, "TestOptVariantByRefByVal(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptVariantByRefByVal(, 456), 456, "TestOptVariantByRefByVal(, 456)"
    TestLog_ASSERT TestOptVariantByRefByVal(123, 456), 579, "TestOptVariantByRefByVal(123, 456)"

    ' optionals with double datatypes
    TestLog_ASSERT TestOptDouble(), 123.4, "TestOptDouble()"
    TestLog_ASSERT TestOptDouble(123.4), 246.8, "TestOptDouble(123.4)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptDouble(, 567.8), 567.8, "TestOptDouble(, 567.8)"
    TestLog_ASSERT Format(TestOptDouble(123.4, 567.8), "0.0"), 691.2, "TestOptDouble(123.4, 567.8)"

    ' optionals with double datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptDoubleByRefByVal(), 123.4, "TestOptDouble()"
    TestLog_ASSERT TestOptDoubleByRefByVal(123.4), 246.8, "TestOptDouble(123.4)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptDoubleByRefByVal(, 567.8), 567.8, "TestOptDoubleByRefByVal(, 567.8)"
    TestLog_ASSERT Format(TestOptDoubleByRefByVal(123.4, 567.8), "0.0"), 691.2, "TestOptDoubleByRefByVal(123.4, 567.8)"

    ' optionals with integer datatypes
    TestLog_ASSERT TestOptInteger(), 123, "TestOptInteger()"
    TestLog_ASSERT TestOptInteger(123), 246, "TestOptInteger(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptInteger(, 456), 456, "TestOptInteger(, 456)"
    TestLog_ASSERT TestOptInteger(123, 456), 579, "TestOptInteger(123, 456)"

    ' optionals with integer datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptIntegerByRefByVal(), 123, "TestOptIntegerByRefByVal()"
    TestLog_ASSERT TestOptIntegerByRefByVal(123), 246, "TestOptIntegerByRefByVal(123)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptIntegerByRefByVal(, 456), 456, "TestOptIntegerByRefByVal(, 456)"
    TestLog_ASSERT TestOptIntegerByRefByVal(123, 456), 579, "TestOptIntegerByRefByVal(123, 456)"

    ' optionals with string datatypes
    TestLog_ASSERT TestOptString(), "123", "TestOptString()"
    TestLog_ASSERT TestOptString("123"), "123123", "TestOptString(""123"")"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptString(, "456"), "456", "TestOptString(, ""456"")"
    TestLog_ASSERT TestOptString("123", "456"), "123456", "TestOptString(""123"", ""456"")"

    ' optionals with string datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptStringByRefByVal(), "123", "TestOptStringByRefByVal()"
    TestLog_ASSERT TestOptStringByRefByVal("123"), "123123", "TestOptStringByRefByVal(""123"")"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT TestOptStringByRefByVal(, "456"), "456", "TestOptStringByRefByVal(, ""456"")"
    TestLog_ASSERT TestOptStringByRefByVal("123", "456"), "123456", "TestOptStringByRefByVal(""123"", ""456"")"

    ' optionals with object datatypes
    Dim cA As New Collection
    cA.Add (123)
    cA.Add (456)
    Dim cB As New Collection
    cB.Add (123.4)
    cB.Add (567.8)
    TestLog_ASSERT TestOptObject(), 0, "TestOptObject()"
    TestLog_ASSERT TestOptObject(cA), 579, "TestOptObject(A)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT Format(TestOptObject(, cB), "0.0"), 691.2, "TestOptObject(, B)"
    TestLog_ASSERT Format(TestOptObject(cA, cB), "0.0"), 1270.2, "TestOptObject(A, B)"

    ' optionals with object datatypes (ByRef and ByVal)
    TestLog_ASSERT TestOptObjectByRefByVal(), 0, "TestOptObjectByRefByVal()"
    TestLog_ASSERT TestOptObjectByRefByVal(cA), 579, "TestOptObjectByRefByVal(A)"
    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT Format(TestOptObjectByRefByVal(, cB), "0.0"), 691.2, "TestOptObjectByRefByVal(, B)"
    TestLog_ASSERT Format(TestOptObjectByRefByVal(cA, cB), "0.0"), 1270.2, "TestOptObjectByRefByVal(A, B)"

    ' optionals with array datatypes
    Dim aA(0 To 1) As Integer
    aA(0) = 123
    aA(1) = 456
    Dim aB(0 To 1) As Variant
    aB(0) = 123.4
    aB(1) = 567.8
    ' TODO - New bug report? Scanner initializes variable not as an array
    ' TestLog_ASSERT TestOptArray(), 0, "TestOptArray()"
    ' TestLog_ASSERT TestOptArray(aA), 579, "TestOptArray(A)"

    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT Format(TestOptArray(, aB), "0.0"), 691.2, "TestOptArray(, B)"
    TestLog_ASSERT Format(TestOptArray(aA, aB), "0.0"), 1270.2, "TestOptArray(A, B)"

    ' optionals with array datatypes (ByRef and ByVal)
    ' TODO - New bug report? Scanner initializes variable not as an array
    ' TestLog_ASSERT TestOptArrayByRefByVal(), 0, "TestOptArrayByRefByVal()"
    ' TestLog_ASSERT TestOptArrayByRefByVal(aA), 579, "TestOptArrayByRefByVal(A)"

    ' TODO - tdf#125180 for more details
    ' TestLog_ASSERT Format(TestOptArrayByRefByVal(, aB), "0.0"), 691.2, "TestOptArrayByRefByVal(, B)"
    TestLog_ASSERT Format(TestOptArrayByRefByVal(aA, aB), "0.0"), 1270.2, "TestOptArrayByRefByVal(A, B)"

    result = result & Chr$(10) & "Tests passed: " & passCount & Chr$(10) & "Tests failed: " & failCount & Chr$(10)
    verify_testOptionalsVba = result

    Exit Function
errorHandler:
    TestLog_ASSERT False, True, Err.Description
End Function

Function TestOptVariant(Optional A, Optional B As Variant = 123)
    TestOptVariant = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptVariantByRefByVal(Optional ByRef A, Optional ByVal B As Variant = 123)
    TestOptVariantByRefByVal = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptDouble(Optional A As Double, Optional B As Double = 123.4)
    TestOptDouble = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptDoubleByRefByVal(Optional ByRef A As Double, Optional ByVal B As Double = 123.4)
    TestOptDoubleByRefByVal = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptInteger(Optional A As Integer, Optional B As Integer = 123)
    TestOptInteger = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptIntegerByRefByVal(Optional ByRef A As Integer, Optional ByVal B As Integer = 123)
    TestOptIntegerByRefByVal = OptNumberSum(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptString(Optional A As String, Optional B As String = "123")
    TestOptString = OptStringConcat(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptStringByRefByVal(Optional ByRef A As String, Optional ByVal B As String = "123")
    TestOptStringByRefByVal = OptStringConcat(IsMissing(A), A, IsMissing(B), B)
End Function

Function TestOptObject(Optional A As Collection, Optional B As Collection)
    ' TODO - isMissing returns false even though the collection is null and is missing?
    TestOptObject = 0
    If Not IsNull(A) Then TestOptObject = CollectionSum(A)
    If Not IsNull(B) Then TestOptObject = TestOptObject + CollectionSum(B)
End Function

Function TestOptObjectByRefByVal(Optional ByRef A As Collection, Optional ByVal B As Collection)
    ' TODO - isMissing returns false even though the collection is null and is missing?
    TestOptObjectByRefByVal = 0
    If Not IsNull(A) Then TestOptObjectByRefByVal = CollectionSum(A)
    If Not IsNull(B) Then TestOptObjectByRefByVal = TestOptObjectByRefByVal + CollectionSum(B)
End Function

Function TestOptArray(Optional A() As Integer, Optional B() As Variant)
    TestOptArray = ArraySum(IsMissing(A), A) + ArraySum(IsMissing(B), B)
End Function

Function TestOptArrayByRefByVal(Optional ByRef A() As Integer, Optional ByVal B() As Variant)
    TestOptArrayByRefByVal = ArraySum(IsMissing(A), A) + ArraySum(IsMissing(B), B)
End Function

Function OptNumberSum(is_missingA As Boolean, A, is_missingB As Boolean, B)
    OptNumberSum = 0
    If Not is_missingA Then OptNumberSum = A
    If Not is_missingB Then OptNumberSum = OptNumberSum + B
End Function

Function OptStringConcat(is_missingA As Boolean, A, is_missingB As Boolean, B)
    OptStringConcat = ""
    If Not is_missingA Then OptStringConcat = A
    If Not is_missingB Then OptStringConcat = OptStringConcat & B
End Function

Function CollectionSum(C)
    Dim idx As Integer
    CollectionSum = 0
    For idx = 1 To C.Count
        CollectionSum = CollectionSum + C.Item(idx)
    Next idx
End Function

Function ArraySum(is_missingC As Boolean, C)
    Dim idx As Integer
    ArraySum = 0
    If Not is_missingC Then
        For idx = LBound(C) To UBound(C)
            ArraySum = ArraySum + C(idx)
        Next idx
    End If
End Function

Sub TestLog_ASSERT(actual As Variant, expected As Variant, testName As String)
    If expected = actual Then
        passCount = passCount + 1
    Else
        result = result & Chr$(10) & " Failed: " & testName & " returned " & actual & ", expected " & expected
        failCount = failCount + 1
    End If
End Sub
\ No newline at end of file
diff --git a/basic/source/runtime/runtime.cxx b/basic/source/runtime/runtime.cxx
index bf7501c..ffd03f2 100644
--- a/basic/source/runtime/runtime.cxx
+++ b/basic/source/runtime/runtime.cxx
@@ -4015,11 +4015,18 @@ void SbiRuntime::StepELEM( sal_uInt32 nOp1, sal_uInt32 nOp2 )
    PushVar( FindElement( pObj, nOp1, nOp2, ERRCODE_BASIC_NO_METHOD, false ) );
}

// loading a parameter (+offset+type)
// If the data type is wrong, create a copy.
// The data type SbxEMPTY shows that no parameters are given.
// Get( 0 ) may be EMPTY
/** Loading of a parameter (+offset+type)
    If the data type is wrong, create a copy and search for optionals including
    the default value. The data type SbxEMPTY shows that no parameters are given.
    Get( 0 ) may be EMPTY

    @param nOp1
    the index of the current parameter being processed,
    where the entry of the index 0 is for the return value.

    @param nOp2
    the data type of the parameter.
 */
void SbiRuntime::StepPARAM( sal_uInt32 nOp1, sal_uInt32 nOp2 )
{
    sal_uInt16 nIdx = static_cast<sal_uInt16>( nOp1 & 0x7FFF );
@@ -4034,23 +4041,7 @@ void SbiRuntime::StepPARAM( sal_uInt32 nOp1, sal_uInt32 nOp2 )
        while( iLoop >= nParamCount )
        {
            pVar = new SbxVariable();

            if( SbiRuntime::isVBAEnabled() &&
                (eType == SbxOBJECT || eType == SbxSTRING) )
            {
                if( eType == SbxOBJECT )
                {
                    pVar->PutObject( nullptr );
                }
                else
                {
                    pVar->PutString( OUString() );
                }
            }
            else
            {
                pVar->PutErr( 448 );       // like in VB: Error-Code 448 (ERRCODE_BASIC_NAMED_NOT_FOUND)
            }
            pVar->PutErr( 448 );       // like in VB: Error-Code 448 (ERRCODE_BASIC_NAMED_NOT_FOUND)
            refParams->Put32( pVar, iLoop );
            iLoop--;
        }
@@ -4078,6 +4069,12 @@ void SbiRuntime::StepPARAM( sal_uInt32 nOp1, sal_uInt32 nOp2 )
                        pVar->PutString( aDefaultStr );
                        refParams->Put32( pVar, nIdx );
                    }
                    else if ( SbiRuntime::isVBAEnabled() && eType != SbxVARIANT )
                    {
                        // tdf#36737 - initialize the parameter with the default value of its type
                        pVar = new SbxVariable( pParam->eType );
                        refParams->Put32( pVar, nIdx );
                    }
                    bOpt = true;
                }
            }