/usr/share/doc/ruby-rspec-expectations/features/custom_matchers/define_matcher_outside_rspec.feature is in ruby-rspec-expectations 3.4.0c3e0m1s1-1ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | 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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