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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_testNPV()
If failCount <> 0 And passCount > 0 Then
doUnitTest = result
Else
doUnitTest = "OK"
End If
End Function
Function verify_testNPV() As String
passCount = 0
failCount = 0
result = "Test Results" & Chr$(10) & "============" & Chr$(10)
Dim testName As String
Dim date1, date2
testName = "Test NPV function"
On Error GoTo errorHandler
Static Values(5) As Double ' Set up array.
Values(0) = -70000 ' Business start-up costs.
' Positive cash flows reflecting income for four successive years.
Values(1) = 22000: Values(2) = 25000
Values(3) = 28000: Values(4) = 31000
date2 = 19312.57
date1 = NPV(0.0625, Values()) ' Calculate net present value.
TestLog_ASSERT Round(date1, 2) = Round(date2, 2), "the return NPV is: " & date1
result = result & Chr$(10) & "Tests passed: " & passCount & Chr$(10) & "Tests failed: " & failCount & Chr$(10)
verify_testNPV = result
Exit Function
errorHandler:
TestLog_ASSERT (False), testName & ": hit error handler"
End Function
Sub TestLog_ASSERT(assertion As Boolean, Optional testId As String, Optional testComment As String)
If assertion = True Then
passCount = passCount + 1
Else
Dim testMsg As String
If Not IsMissing(testId) Then
testMsg = testMsg + " : " + testId
End If
If Not IsMissing(testComment) And Not (testComment = "") Then
testMsg = testMsg + " (" + testComment + ")"
End If
result = result & Chr$(10) & " Failed: " & testMsg
failCount = failCount + 1
End If
End Sub
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