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Project: RSpec Expectations 2.8

cover matcher

  • @ruby-1.9

Use the cover matcher to specify that a range covers one or more
expected objects. This works on any object that responds to #cover? (such
as a Range):

(1..10).should cover(5)
(1..10).should cover(4, 6)
(1..10).should_not cover(11)

Scenarios
range usage
Given
a file named "range_cover_matcher_spec.rb" with:
describe (1..10) do
  it { should cover(4) }
  it { should cover(6) }
  it { should cover(8) }
  it { should cover(4, 6) }
  it { should cover(4, 6, 8) }
  it { should_not cover(11) }
  it { should_not cover(11, 12) }

  # deliberate failures
  it { should cover(11) }
  it { should_not cover(4) }
  it { should_not cover(6) }
  it { should_not cover(8) }
  it { should_not cover(4, 6, 8) }

  # both of these should fail since it covers 5 but not 11
  it { should cover(5, 11) }
  it { should_not cover(5, 11) }
end
When
I run rspec range_cover_matcher_spec.rb
Then
the output should contain all of these:
14 examples, 7 failures
expected 1..10 to cover 11
expected 1..10 not to cover 4
expected 1..10 not to cover 6
expected 1..10 not to cover 8
expected 1..10 not to cover 4, 6, and 8
expected 1..10 to cover 5 and 11
expected 1..10 not to cover 5 and 11

Last published over 1 year ago by dchelimsky.