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Option VBASupport 1
Option Explicit
Dim passCount As Integer
Dim failCount As Integer
Dim result As String
Function doUnitTest() As String
result = verify_testDateAdd()
If failCount <> 0 Or passCount = 0 Then
doUnitTest = result
Else
doUnitTest = "OK"
End If
End Function
Function verify_testDateAdd() As String
passCount = 0
failCount = 0
result = "Test Results" & Chr$(10) & "============" & Chr$(10)
Dim testName As String
Dim date1, date2 As Date 'variables for test
testName = "Test DateAdd function"
On Error GoTo errorHandler
date2 = CDate("1995-02-28")
date1 = DateAdd("m", 1, "1995-01-31")
TestLog_ASSERT date1 = date2, "the return DateAdd is: " & date1
date2 = CDate("1995-02-28")
date1 = DateAdd("m", 1, "1995-01-31")
TestLog_ASSERT date1 = date2, "the return DateAdd is: " & date1
date2 = CDate("1995-02-28")
date1 = DateAdd("m", 1, "1995-01-31")
TestLog_ASSERT date1 = date2, "the return DateAdd is: " & date1
date2 = CDate("1996-01-31")
date1 = DateAdd("yyyy", 1, "1995-01-31")
TestLog_ASSERT date1 = date2, "the return DateAdd is: " & date1
date2 = CDate("1995-04-30")
date1 = DateAdd("q", 1, "1995-01-31")
TestLog_ASSERT date1 = date2, "the return DateAdd is: " & date1
date2 = CDate("1995-02-01")
date1 = DateAdd("y", 1, "1995-01-31")
TestLog_ASSERT date1 = date2, "the return DateAdd is: " & date1
date2 = CDate("1995-02-01")
date1 = DateAdd("d", 1, "1995-01-31")
TestLog_ASSERT date1 = date2, "the return DateAdd is: " & date1
date2 = CDate("1995-02-01")
date1 = DateAdd("w", 1, "1995-01-31")
TestLog_ASSERT date1 = date2, "the return DateAdd is: " & date1
date2 = CDate("1995-02-07")
date1 = DateAdd("ww", 1, "1995-01-31")
TestLog_ASSERT date1 = date2, "the return DateAdd is: " & date1
Rem This fails when directly comparing date1=date2, probably due to rounding.
Rem Workaround convert to string which does the rounding.
Dim date1s, date2s As String
date2 = CDate("1995-01-01 22:48:29")
date1 = DateAdd("h", 1, "1995-01-01 21:48:29")
date1s = "" & date1
date2s = "" & date2
TestLog_ASSERT date1s = date2s, "the return DateAdd is: " & date1
date2 = CDate("1995-01-31 21:49:29")
date1 = DateAdd("n", 1, "1995-01-31 21:48:29")
TestLog_ASSERT date1 = date2, "the return DateAdd is: " & date1
date2 = CDate("1995-01-31 21:48:30")
date1 = DateAdd("s", 1, "1995-01-31 21:48:29")
TestLog_ASSERT date1 = date2, "the return DateAdd is: " & date1
exitFunc:
result = result & Chr$(10) & "Tests passed: " & passCount & Chr$(10) & "Tests failed: " & failCount & Chr$(10)
verify_testDateAdd = result
Exit Function
errorHandler:
On Error GoTo 0
TestLog_ASSERT (False), testName & ": hit error handler"
GoTo exitFunc
End Function
Sub TestLog_ASSERT(assertion As Boolean, Optional testId As String, Optional testComment As String)
If assertion = True Then
passCount = passCount + 1
Else
Dim testMsg As String
If Not IsMissing(testId) Then
testMsg = testMsg + " : " + testId
End If
If Not IsMissing(testComment) And Not (testComment = "") Then
testMsg = testMsg + " (" + testComment + ")"
End If
result = result & Chr$(10) & " Failed: " & testMsg
failCount = failCount + 1
End If
End Sub
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