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function MyValidator($thing_to_validate) {
return $thing_to_validate.StartsWith("s")
}
function Invoke-SomethingThatUsesMyValidator {
param(
[ValidateScript({MyValidator $_})]
$some_param
)
}
Describe "Testing a validator" {
It "calls MyValidator" {
Mock MyValidator -MockWith { return $true }
Invoke-SomethingThatUsesMyValidator "test"
$was_called_once = 1
Assert-MockCalled MyValidator $was_called_once
}
}
Describe "MyValidator" {
It "passes things that start with the letter S" {
$result = MyValidator "summer"
$result | Should Be $true
}
It "does not pass a param that does not start with S" {
$result = MyValidator "bummer"
$result | Should Be $false
}
}