问题
When I run the following pester test I expect it to catch the expected error but it doesn't. But when I run the test with a different function with a different throw statement it works.
Pester Test:
Describe "Remove-GenericCredential Function Tests" {
$InternetOrNetworkAddress = 'https://PesterTestUser@PesterTestURl.com'
Context "Test: Remove-GenericCredential -InternetOrNetworkAddress '$InternetOrNetworkAddress' (Credential does not exist)" {
It "This Command threw an error. The credential does not exist." { { (Remove-GenericCredential -InternetOrNetworkAddress $InternetOrNetworkAddress -Confirm:$false) } | should throw "Remove-GenericCredential : Credential $InternetOrNetworkAddress not found" }
}
}
Error that isn't caught:
Remove-GenericCredential : Credential https://PesterTestUser@PesterTestURl.com not found
At C:\Users\klocke7\Documents\WindowsPowerShell\Modules\Ford_CredentialManager\Tests\Remove-GenericCredential.Tests.ps1:30 char:76
+ ... xist." { { (Remove-GenericCredential -InternetOrNetworkAddress $Inter ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Write-Error], WriteErrorException
+ FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Remove-GenericCredential
[-] This Command threw an error. The credential does not exist. 44ms
Expected: the expression to throw an exception with message {Remove-GenericCredential : Credential https://PesterTestUser@PesterTestURl.com not found}, an exception was not raised, message was {}
from C:\Users\klocke7\Documents\WindowsPowerShell\Modules\Ford_CredentialManager\Tests\New-GitHubCredential.Tests.ps1:59 char:176
+ ... e $UserName -Token 'NotAGitHubTokenSpecialCharacters!@#$%^&*') } | sh ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
at <ScriptBlock>, C:\Users\klocke7\Documents\WindowsPowerShell\Modules\Ford_CredentialManager\Tests\Remove-GenericCredential.Tests.ps1: line 30
30: It "This Command threw an error. The credential does not exist." { { (Remove-GenericCredential -InternetOrNetworkAddress $InternetOrNetworkAddress -Confirm:$false) } | should throw 'Remove-GenericCredential : Credential https://PesterTestUser@PesterTestURl.com not found' }
回答1:
Per the other answer, the function is throwing a non-terminating error and as such its not being considered to match the test of Should Throw
, which is checking for terminating errors.
There are two ways you could address this:
- You could change it so that it throws a terminating error by changing your
Write-Error
toThrow
. - You could change the test to force the function to throw a terminating error even when non-terminating ones occur by using
-ErrorAction Stop
when you invoke it (I can see you're using-Confirm
, I assume you have used[cmdletbinding()]
in the function to add the common parameters like-ErrorAction
).
Here's an example of the second solution (I've simulated the function at the top so that I could test this, but you don't need to include that in your test script):
Function Remove-GenericCredential {
[cmdletbinding(supportsshouldprocess)]
Param(
$InternetOrNetworkAddress
)
Write-Error "Remove-GenericCredential : Credential $InternetOrNetworkAddress not found"
}
Describe "Remove-GenericCredential Function Tests" {
$InternetOrNetworkAddress = 'https://PesterTestUser@PesterTestURl.com'
Context "Test: Remove-GenericCredential -InternetOrNetworkAddress '$InternetOrNetworkAddress' (Credential does not exist)" {
It "This Command threw an error. The credential does not exist." {
{ (Remove-GenericCredential -InternetOrNetworkAddress $InternetOrNetworkAddress -Confirm:$false -ErrorAction Stop) } | should throw "Remove-GenericCredential : Credential $InternetOrNetworkAddress not found" }
}
}
From help Write-Error
:
The Write-Error cmdlet declares a non-terminating error. By default, errors are sent in the error stream to the host program to be displayed, along with output.
To write a non-terminating error, enter an error message string, an ErrorRecord object, or an Exception object. Use the other parameters of Write-Error to populate the error record.
Non-terminating errors write an error to the error stream, but they do not stop command processing. If a non-terminating error is declared on one item in a collection of input items, the command continues to process the other items in the collection.
To declare a terminating error, use the Throw keyword. For more information, see about_Throw (http://go.microsoft.com/fwlink/?LinkID=145153).
回答2:
This is probably because the cmdlet is throwing a non-terminating error because Pester only asserts against terminating errors. In this case need to rewrite the test as follows (using old Pester v3 synatax as per your example):
It "Test a non-terminating error gets thrown" {
$errorThrown = $false;
try
{
Invoke-CmdletThatThrowsNonTerminatingError -ErrorAction Stop
}
catch
{
$errorThrown = $true
}
$errorThrown | Should Be $true
}
In the catch block you can also get exception details such as message or exception type on the $_
ob
来源:https://stackoverflow.com/questions/49181479/pester-doesnt-catch-the-thrown-error