Creates a logical group of tests. All Mocks and TestDrive contents defined within a Describe block are scoped to that Describe; they will no longer be present when the Describe block exits. A Describe block may contain any number of Context and It blocks.


   [-Name] <String>
   [-Tags <Object>]
   [[-Fixture] <ScriptBlock>]


{{Fill in the Description}}


-------------------------- EXAMPLE 1 --------------------------

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"


Required Parameters


The name of the test group. This is often an expressive phrase describing the scenario being tested.

Default value:None
Accept pipeline input:False
Accept wildcard characters:False

Optional Parameters


The actual test script. If you are following the AAA pattern (Arrange-Act-Assert), this typically holds the arrange and act sections. The Asserts will also lie in this block but are typically nested each in its own It block. Assertions are typically performed by the Should command within the It blocks.

Default value:$(Throw "No test script block is provided. (Have you put the open curly brace on the next line?)")
Accept pipeline input:False
Accept wildcard characters:False

Optional parameter containing an array of strings. When calling Invoke-Pester, it is possible to specify a -Tag parameter which will only execute Describe blocks containing the same Tag.

Default value:@()
Accept pipeline input:False
Accept wildcard characters:False