/usr/share/doc/ruby-rspec-expectations/features/custom_matchers/define_block_matcher.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 33 34 35 36 37 38 39 40 41 42 43 44 | Feature: define a matcher supporting block expectations
When you wish to support block expectations (e.g. `expect { ... }.to matcher`) with
your custom matchers you must specify this. You can do this manually (or determinately
based on some logic) by defining a `supports_block_expectation?` method or by using
the DSL's `supports_block_expectations` shortcut method.
Scenario: define a block matcher manually
Given a file named "block_matcher_spec.rb" with:
"""ruby
RSpec::Matchers.define :support_blocks do
match do |actual|
actual.is_a? Proc
end
def supports_block_expectations?
true # or some logic
end
end
RSpec.describe "a custom block matcher" do
specify { expect { }.to support_blocks }
end
"""
When I run `rspec ./block_matcher_spec.rb`
Then the example should pass
Scenario: define a block matcher using shortcut
Given a file named "block_matcher_spec.rb" with:
"""ruby
RSpec::Matchers.define :support_blocks do
match do |actual|
actual.is_a? Proc
end
supports_block_expectations
end
RSpec.describe "a custom block matcher" do
specify { expect { }.to support_blocks }
end
"""
When I run `rspec ./block_matcher_spec.rb`
Then the example should pass
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