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Feature: define matcher outside rspec
You can define custom matchers when using rspec-expectations outside of rspec-core.
Scenario: define a matcher with default messages
Given a file named "test_multiples.rb" with:
"""ruby
require "minitest/autorun"
require "rspec/expectations/minitest_integration"
RSpec::Matchers.define :be_a_multiple_of do |expected|
match do |actual|
actual % expected == 0
end
end
class TestMultiples < Minitest::Test
def test_9_should_be_a_multiple_of_3
expect(9).to be_a_multiple_of(3)
end
def test_9_should_be_a_multiple_of_4
expect(9).to 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 runs, 2 assertions, 1 failures, 0 errors"
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