Mastering Windows PowerShell Scripting - Second Edition

Test cases

When the inputs and outputs of a function are being repetitively tested, the TestCases parameter of It can be used. Test cases are defined in a hashtable, which is splatted into It as a set of parameters.

The four test cases used in the preceding example might be rewritten as follows:

$testCases = @( 
    @{ Value = 1;  ExpectedResult = 1 } 
    @{ Value = 4;  ExpectedResult = 2 } 
    @{ Value = 9;  ExpectedResult = 33 } 
    @{ Value = 16; ExpectedResult = 44 } 
) 
 
It 'Calculates the square root of <Value>to be<ExpectedResult>' -TestCases $testCases { 
    param ( 
        $Value, 
        $ExpectedResult 
    ) 
 
    Get-SquareRoot $Value | Should -Be $ExpectedResult 
} 

The preceding tests still contain errors; the advantage of this approach is that Pester will report success or failure ...