Project: RSpec Expectations 2.3

Publisher: RSpec

define matcher outside rspec

In order to express my domain clearly in my code examples
As a non-rspec user
I want a shortcut to define custom matchers

Scenarios

define a matcher with default messages

Given

a file named "test_multiples.rb" with:

require "rspec/expectations"
require "test/unit"

RSpec::Matchers.define :be_a_multiple_of do |expected|
  match do |actual|
    actual % expected == 0
  end
end

class Test::Unit::TestCase
  include RSpec::Matchers
end

class TestMultiples < Test::Unit::TestCase

  def test_9_should_be_a_multiple_of_3
    9.should be_a_multiple_of(3)
  end

  def test_9_should_be_a_multiple_of_4
    9.should be_a_multiple_of(4)
  end
  
end

When

I run "ruby test_multiples.rb"

Then

the exit status should not be 0

And

the output should contain "expected 9 to be a multiple of 4"

And

the output should contain "2 tests, 0 assertions, 0 failures, 1 errors"

Last published about 6 years ago by dchelimsky.

define matcher outside rspec

RSpec Expectations settings