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module Micronaut
module Matchers
# wraps an expectation in a block that will return true if the
# expectation passes and false if it fails (without bubbling up
# the failure).
#
# This is intended to be used in the context of a simple matcher,
# and is especially useful for wrapping multiple expectations or
# one or more assertions from test/unit extensions when running
# with test/unit.
#
# == Examples
#
# def eat_cheese(cheese)
# simple_matcher do |mouse, matcher|
# matcher.negative_failure_message = "expected #{mouse} not to eat cheese"
# wrap_expectation do |matcher|
# assert_eats_cheese(mouse)
# end
# end
# end
#
# describe Mouse do
# it "eats cheese" do
# Mouse.new.should eat_cheese
# end
# end
#
# You might be wondering "why would I do this if I could just say"
# assert_eats_cheese?", a fair question, indeed. You might prefer
# to replace the word assert with something more aligned with the
# rest of your code examples. You are using rspec, after all.
#
# The other benefit you get is that you can use the negative version
# of the matcher:
#
# describe Cat do
# it "does not eat cheese" do
# Cat.new.should_not eat_cheese
# end
# end
#
# So in the event there is no assert_does_not_eat_cheese available,
# you're all set!
def wrap_expectation(matcher, &block)
begin
block.call(matcher)
return true
rescue Exception => e
matcher.failure_message = e.message
return false
end
end
end
end
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