Expected: RSpec Matchers - Extended

Adds several simple matchers to RSpec

Installation

Add to Gemfile

group :test do
  gem 'expected'
end

Add to RSpec

Add the following to your projects spec/rails_helper.rb for Rails apps, or spec/spec_helper.rb for non-Rails apps.

Expected.configure

Usage

`be_a_concern`

Used to test that a Module is an ActiveSupport::Concern

# Test if the subject is an ActiveSupport::Concern`
it { is_expected.to be_a_concern }

`extend_module`

Used to test that a Class or Module extends the supplied Module

# Test if the subject extends the supplied Module
it { is_expected.to extend_module(SomeModule) }

`have_constant`

Used to test constants

# Test if a constant exists
it { is_expected.to have_constant(:FOO) }

# Test if a constant has a specific value
it { is_expected.to have_constant(:FOO).with_value("bar") }

# Test if a constant's value is a specific type
it { is_expected.to have_constant(:FOO).of_type(String) }

`have_attr_reader`

Used to test inclusion of attr_reader :attribute

# Test if the subject has `attr_reader :attribute`
it { is_expected.to have_attr_reader(:attribute) }

`have_attr_writer`

Used to test inclusion of attr_writer :attribute

# Test if the subject has `attr_writer :attribute`
it { is_expected.to have_attr_writer(:attribute) }

`have_attr_accessor`

Used to test inclusion of attr_accessor :attribute

# Test if the subject has `attr_accessor :attribute`
it { is_expected.to have_attr_accessor(:attribute) }

`include_module`

Used to test that a Class or Module includes the supplied Module

# Test if the subject includes the supplied Module
it { is_expected.to include_module(SomeModule) }

`inherit_from`

Used to test inheritance

# Test if the subject inherits from the supplied Class
it { is_expected.to inherit_from(SomeClass) }

expected

Runtime