Pester 'Should -BeLike'

Question

I have this test:

It 'Should not find environment' {

    {Add-Patchgroup -ComputerName $serversHash.serverWithNotExistingEnvironment -WarningVariable warning -WarningAction SilentlyContinue}
    $warning  | Should -BeLike ('*55555*')
}

$warning contains this string (exactly as you see here with the newline and whitespace on the second row):

Could not add <nameOfTheServer> to patchgroup
 Exception message: Environment F was not found

But my test is passing which it should not:

Context Find the environment
      [+] Should not find environment 79ms
      [+] Should find environment 147ms

It seems like the test is not working at all even with -Be parameter. The test is still passing.

$warning  | Should -Be 'randomrandom'

Mark Wragg Mark Wragg · Accepted Answer · 2018-07-27T10:38:33

I'm not sure why your test is passing, and that is very strange. But I think part of your issue may be that you are executing your command within a scriptblock, and that therefore the warning variable is only populated/accessible within the scope of that scriptblock.

Also, generally I also tend to do my execution outside of the It and then only use the it block for the assertion.

I therefore suggest you try this:

Add-Patchgroup -ComputerName $serversHash.serverWithNotExistingEnvironment -WarningVariable warning -WarningAction SilentlyContinue

It 'Should not find environment' {
    $warning  | Should -BeLike '*55555*'
}

Note I've also removed the brackets around the string you are asserting $warning to be like, as I think these are redundant.

Pester 'Should -BeLike'

2 Answers