It

Validates the results of a test inside of a Describe or Context block.

DESCRIPTION

The It command is intended to be used inside of a Describe or Context Block. If you are familiar with the AAA pattern (Arrange-Act-Assert), the body of the It block is the appropriate location for an assert. The convention is to assert a single expectation for each It block. The code inside of the It block should throw an exception if the expectation of the test is not met and thus cause the test to fail. The name of the It block should expressively state the expectation of the test.

In addition to using your own logic to test expectations and throw exceptions, you may also use Pester's Should command to perform assertions in plain language.

PARAMETERS

###Name An expressive phrase describing the expected test outcome.

###Test The script block that should throw an exception if the expectation of the test is not met. If you are following the AAA pattern (Arrange-Act-Assert), this typically holds the Assert.

EXAMPLE

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

Describe "Add-Numbers" {
    It "adds positive numbers" {
        $sum = Add-Numbers 2 3
        $sum | Should Be 5
    }

    It "adds negative numbers" {
        $sum = Add-Numbers (-2) (-2)
        $sum | Should Be (-4)
    }

    It "adds one negative number to positive number" {
        $sum = Add-Numbers (-2) 2
        $sum | Should Be 0
    }

    It "concatenates strings if given strings" {
        $sum = Add-Numbers two three
        $sum | Should Be "twothree"
    }

}