rePS

0.1.0

Exercises/Functions/func-pipeline-input/tests.Tests.ps1

                                param([Parameter(Mandatory)][string]$SolutionPath)

BeforeAll {

    . $SolutionPath

}

Describe 'Get-Square' {

    It 'squares piped numbers' {

        1..3 | Get-Square | Should -Be @(1, 4, 9)

    }

    It 'squares an array passed by name' {

        Get-Square -Number 4, 5 | Should -Be @(16, 25)

    }

    It 'streams (first result arrives before input ends)' {

        $script:consumed = 0

        $first = 1..1000 | ForEach-Object { $script:consumed++; $_ } | Get-Square | Select-Object -First 1

        $first | Should -Be 1

        $script:consumed | Should -BeLessThan 1000 -Because 'a buffering function (end block only) reads all input before emitting anything'

    }

    It 'binds the Number parameter from the pipeline' {

        $p = (Get-Command Get-Square).Parameters['Number'].Attributes |

            Where-Object { $_ -is [System.Management.Automation.ParameterAttribute] }

        $p.ValueFromPipeline | Should -BeTrue

    }

}