Descriptions of matchers with an array of strings.

matcher_description_spec.rb

require 'rspec'

describe 'Matcher description' do
  it 'returns the correct description' do
    [
        [be(['foo']), 'equal "foo"'],
        [be_a(['foo']), 'be a kind of "foo"'],
        [be_an_instance_of(['foo']), 'be an instance of ["foo"]'],
        [be_within(['foo']), 'be within ["foo"] of '],
        [contain_exactly(['foo']), 'contain exactly ["foo"]'],
        [cover(['foo']), 'cover ["foo"]'],
        [end_with(['foo']), 'end with "foo"'],
        [eq(['foo']), 'eq ["foo"]'],
        [eql(['foo']), 'eql "foo"'],
        [equal(['foo']), 'equal "foo"'],
        [exist(['foo']), 'exist ["foo"]'],
        [include(['foo']), 'include ["foo"]'],
        [match(['foo']), 'match ["foo"]'],
        [match_array(['foo']), 'contain exactly "foo"'],
        [raise_error(['foo']), 'raise ["foo"]'],
        [respond_to(['foo']), 'respond to #["foo"]'],
        [start_with(['foo']), 'start with "foo"'],
        [throw_symbol(['foo']), 'throw ["foo"]'],
        [yield_with_args(['foo']), 'yield with args(["foo"])'],
        [yield_successive_args(['foo']), 'yield successive args(["foo"])'],
        [yield_with_args(['foo']), 'yield with args(["foo"])'],
    ].each do |matcher, expected_description|
      expect(matcher.description).to eq(expected_description)
    end
  end
end