en-US/about_should.help.txt

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TOPIC
    Should
 
SYNOPSIS
    Provides assertion convenience methods for comparing objects and throwing
    test failures when test expectations fail.
 
DESCRIPTION
    Should is an Extension of System.Object and can be used as a native type
    inside Describe blocks. The various Should member methods can be invoked
    directly from an object being compared. It is typically used in individual
    It blocks to verify the results of an expectation. The Should method is
    typically called from the "actual" object being compared and takes the
    "expected" object as a parameter. Should includes several members that
    perform various comparisons of objects and will throw a PesterFailure when
    the objects do not evaluate to be comparable.
 
SHOULD MEMBERS
 
    Be
        Compares one object with another for equality and throws if the two
        objects are not the same.
 
        $actual="Actual value"
        $actual | Should Be "actual value" # Test will pass
        $actual | Should Be "not actual value" # Test will fail
 
    BeExactly
        Compares one object with another for equality and throws if the two objects are not the same. This comparison is case sensitive.
 
        $actual="Actual value"
        $actual | Should BeExactly "Actual value" # Test will pass
        $actual | Should BeExactly "actual value" # Test will fail
         
    BeGreaterThan
        Asserts that a number is greater than an expected value. Uses PowerShell's -gt operator to compare the two values.
         
        $Error.Count | Should BeGreaterThan 0
 
    BeLessThan
        Asserts that a number is less than an expected value. Uses PowerShell's -gt operator to compare the two values.
         
        $Error.Count | Should BeLessThan 1
 
    Exist
        Does not perform any comparison but checks if the object calling Exist
        is present in a PS Provider. The object must have valid path syntax. It
        essentially must pass a Test-Path call.
 
        $actual=(Dir . )[0].FullName
        Remove-Item $actual
        $actual | Should Exist # Test will fail
 
    Contain
        Checks to see if a file contains the specified text. This search is not case sensitive and uses regular expressions.
         
        Set-Content -Path TestDrive:\file.txt -Value 'I am a file.'
        'TestDrive:\file.txt' | Should Contain 'I Am' # Test will pass
        'TestDrive:\file.txt' | Should Contain '^I.*file$' # Test will pass
 
        'TestDrive:\file.txt' | Should Contain 'I Am Not' # Test will fail
 
        Tip: Use [regex]::Escape("pattern") to match the exact text.
         
        Set-Content -Path TestDrive:\file.txt -Value 'I am a file.'
        'TestDrive:\file.txt' | Should Contain 'I.am.a.file' # Test will pass
        'TestDrive:\file.txt' | Should Contain ([regex]::Escape('I.am.a.file')) # Test will fail
 
    ContainExactly
        Checks to see if a file contains the specified text. This search is case sensitive and uses regular expressions to match the text.
 
        Set-Content -Path TestDrive:\file.txt -Value 'I am a file.'
        'TestDrive:\file.txt' | Should Contain 'I am' # Test will pass
        'TestDrive:\file.txt' | Should Contain 'I Am' # Test will fail
 
    Match
        Uses a regular expression to compare two objects. This comparison is not case sensitive.
 
        "I am a value" | Should Match "I Am" # Test will pass
        "I am a value" | Should Match "I am a bad person" # Test will fail
 
        Tip: Use [regex]::Escape("pattern") to match the exact text.
 
        "Greg" | Should Match ".reg" # Test will pass
        "Greg" | Should Match ([regex]::Escape(".reg")) # Test will fail
 
    MatchExactly
        Uses a regular expression to compare two objects. This comparison is case sensitive.
 
        "I am a value" | Should MatchExactly "I am" # Test will pass
        "I am a value" | Should MatchExactly "I Am" # Test will fail
 
    Throw
        Checks if an exception was thrown in the input ScriptBlock.
 
        { foo } | Should Throw # Test will pass
        { $foo = 1 } | Should Throw # Test will fail
        { foo } | Should Not Throw # Test will fail
        { $foo = 1 } | Should Not Throw # Test will pass
 
        Warning: The input object must be a ScriptBlock, otherwise it is processed outside of the assertion.
 
        Get-Process -Name "process" -ErrorAction Stop | Should Throw # Should pass, but the exception thrown by Get-Process causes the test to fail.
 
    BeNullOrEmpty
        Checks values for null or empty (strings). The static [String]::IsNullOrEmpty() method is used to do the comparison.
 
        $null | Should BeNullOrEmpty # Test will pass
        $null | Should Not BeNullOrEmpty # Test will fail
        @() | Should BeNullOrEmpty # Test will pass
        "" | Should BeNullOrEmpty # Test will pass
 
USING SHOULD IN A TEST
 
    function Add-Numbers($a, $b) {
        return $a + $b
    }
 
    Describe "Add-Numbers" {
 
        It "adds positive numbers" {
            $sum = Add-Numbers 2 3
            $sum | should be 3
        }
    }
 
    This test will fail since 3 will not be equal to the sum of 2 and 3.
 
SEE ALSO
    Describe
    Context
    It