Pester assert failed

Pester
1

Hi experts,

I’m writing a PowerShell function that imports System.Security.SecureString from the pre-exported ‘Standard Encrypted String’ and ‘Encryption Key’, and I ran into an issue when I was writing Pester test for it. Here is the simplified example:

function Import-SecureString ($str, $key) {
    ConvertTo-SecureString -String $str -Key $key
}

Describe 'Import-SecureString' {
    BeforeAll {
        $password = '123456'
        $encryptionKey = New-Object -TypeName System.Byte[] -ArgumentList 24
        $RNGCryptoServiceProvider = New-Object -TypeName System.Security.Cryptography.RNGCryptoServiceProvider
        $RNGCryptoServiceProvider.GetBytes($encryptionKey)
        $encryptedStandardString = ConvertTo-SecureString -String $password -AsPlainText -Force | ConvertFrom-SecureString -Key $encryptionKey
    }

    Context 'Unit Test' {
        Mock ConvertTo-SecureString

        Import-SecureString -str $encryptedStandardString -key $encryptionKey

        It 'Should bind VAR $encryptedStandardString to PARAM str' {
            $assert = @{
                CommandName = 'ConvertTo-SecureString'
                Times = 1
                Exactly = $true
                ParameterFilter = {$String -eq $encryptedStandardString}
            }
            Assert-MockCalled @assert
        }

        It 'Should bind VAR $encryptionKey to PARAM key' {
            $assert = @{
                CommandName = 'ConvertTo-SecureString'
                Times = 1
                Exactly = $true
                ParameterFilter = {$Key -eq $encryptionKey}
            }
            Assert-MockCalled @assert
        }
    }
}

In this example, the first ‘It’ block passed and the second failed, how can I correctly assert the second one?

2

Can you share the pester output for the failed test case.

3

Hi kvprasoon,

Here is the output:

Describing Import-SecureString

  Context Unit Test
    [+] Should bind VAR $encryptedStandardString to PARAM str 5ms
    [-] Should bind VAR $encryptionKey to PARAM key 8ms
      Expected ConvertTo-SecureString to be called 1 times exactly but was called 0 times
      36:             Assert-MockCalled @assert

Also, if I replace the key with “123”, although the key length is invalid, the test will pass:

function Import-SecureString ($str, $key) {
    ConvertTo-SecureString -String $str -Key $key
}

Describe 'Import-SecureString' {
    BeforeAll {
        $encryptedStandardString = ConvertTo-SecureString -String '123456' -AsPlainText -Force | ConvertFrom-SecureString
        $encryptionKey = '123'
    }

    Context 'Unit Test' {
        Mock ConvertTo-SecureString

        Import-SecureString -str $encryptedStandardString -key $encryptionKey

        It 'Should bind VAR $encryptedStandardString to PARAM str' {
            $assert = @{
                CommandName = 'ConvertTo-SecureString'
                Times = 1
                Exactly = $true
                ParameterFilter = {$String -eq $encryptedStandardString}
            }
            Assert-MockCalled @assert
        }

        It 'Should bind VAR $encryptionKey to PARAM key' {
            $assert = @{
                CommandName = 'ConvertTo-SecureString'
                Times = 1
                Exactly = $true
                ParameterFilter = {$Key -eq $encryptionKey}
            }
            Assert-MockCalled @assert
        }
    }
}
4

not getting any clue here, will include Jakub here.

5

Hi kvprasoon,

Should I submit an issue to GitHub?

6

That’ll be better.

7

same problem i faced

8

Can you share the pester output for the failed test case.

9

Both tests pass on my computer (macOS / Pwsh 6.2.1 / Pester 4.8.1), can everybody else replicate it? What versions are you using?