Loop through test cases in pester https://github.com/pester/Pester/issues/179

pester-testcases.ps1

function Add-Numbers($a, $b) {
    return $a + $b
}

Describe "Add-Numbers" {
    $testCases = @(
        @{ a = 2;     b = 3;       expectedResult = 5 }
        @{ a = -2;    b = -2;      expectedResult = -4 }
        @{ a = -2;    b = 2;       expectedResult = 0 }
        @{ a = 'two'; b = 'three'; expectedResult = 'twothree' }
    )

    It 'Correctly adds <a> and <b> to get <expectedResult>' -TestCases $testCases {
        param ($a, $b, $expectedResult)

        $sum = Add-Numbers $a $b
        $sum | Should Be $expectedResult
    }
}