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---
layout: base
title: Testing Type Aliases
icon: fa fa-exchange
breadcrumbs:
-
name: Documentation
path: /documentation/
---
## Basic Test Structure
Tests for data type aliases should be placed under `spec/type_aliases`. For
example, the tests for the `MyModule::Shape` type alias would be placed in
`spec/type_aliases/mymodule_shape_spec.rb`.
{% highlight ruby %}
require 'spec_helper'
describe 'MyModule::Shape' do
# tests go here
end
{% endhighlight %}
## Testing The Allowed Value(s)
The `allow_value` matcher is used to test how the type alias behaves when given
a particular value.
{% highlight ruby %}
it { is_expected.to allow_value('square') }
{% endhighlight %}
Multiple values can be provided in a single test using the `allow_values`
matcher
{% highlight ruby %}
it { is_expected.to allow_values('circle', 'triangle') }
{% endhighlight %}
## Testing Disallowed Values
You can negate the `allow_value` matcher to test expected failure cases.
{% highlight ruby %}
it { is_expected.not_to allow_values('line', 'point') }
{% endhighlight %}
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