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$ActualExceptionMessage = ""
$ActualExceptionWasThrown = $false
# because this is a script block, the user will have to
# wrap the code they want to assert on in { }
function PesterThrow([scriptblock] $script, $expectedErrorMessage) {
$Script:ActualExceptionMessage = ""
$Script:ActualExceptionWasThrown = $false
try {
# Redirect to $null so script output does not enter the pipeline
& $script > $null
} catch {
$Script:ActualExceptionWasThrown = $true
$Script:ActualExceptionMessage = $_.Exception.Message
$Script:ActualExceptionLine = Get-ExceptionLineInfo $_.InvocationInfo
}
if ($ActualExceptionWasThrown) {
return Get-DoMessagesMatch $ActualExceptionMessage $expectedErrorMessage
}
return $false
}
function Get-DoMessagesMatch($value, $expected) {
if ($expected -eq "") { return $false }
return $value.Contains($expected)
}
function Get-ExceptionLineInfo($info) {
# $info.PositionMessage has a leading blank line that we need to account for in PowerShell 2.0
$positionMessage = $info.PositionMessage -split '\r?\n' -match '\S' -join "`r`n"
return ($positionMessage -replace "^At ","from ")
}
function PesterThrowFailureMessage($value, $expected) {
if ($expected) {
return "Expected: the expression to throw an exception with message {{{0}}}, an exception was {2}raised, message was {{{1}}}`n {3}" -f
$expected, $ActualExceptionMessage,(@{$true="";$false="not "}[$ActualExceptionWasThrown]),($ActualExceptionLine -replace "`n","`n ")
} else {
return "Expected: the expression to throw an exception"
}
}
function NotPesterThrowFailureMessage($value, $expected) {
if ($expected) {
return "Expected: the expression not to throw an exception with message {{{0}}}, an exception was {2}raised, message was {{{1}}}`n {3}" -f
$expected, $ActualExceptionMessage,(@{$true="";$false="not "}[$ActualExceptionWasThrown]),($ActualExceptionLine -replace "`n","`n ")
} else {
return "Expected: the expression not to throw an exception. Message was {{{0}}}`n {1}" -f $ActualExceptionMessage,($ActualExceptionLine -replace "`n","`n ")
}
}