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module RSpec
module Expectations
class << self
# @private
class Differ
# @private
OBJECT_PREPARER = lambda do |object|
RSpec::Matchers::Composable.surface_descriptions_in(object)
end
end
# @private
def differ
RSpec::Support::Differ.new(
:object_preparer => Differ::OBJECT_PREPARER,
:color => RSpec::Matchers.configuration.color?
)
end
# Raises an RSpec::Expectations::ExpectationNotMetError with message.
# @param [String] message
# @param [Object] expected
# @param [Object] actual
#
# Adds a diff to the failure message when `expected` and `actual` are
# both present.
def fail_with(message, expected=nil, actual=nil)
unless message
raise ArgumentError, "Failure message is nil. Does your matcher define the " \
"appropriate failure_message[_when_negated] method to return a string?"
end
message = ::RSpec::Matchers::ExpectedsForMultipleDiffs.from(expected).message_with_diff(message, differ, actual)
RSpec::Support.notify_failure(RSpec::Expectations::ExpectationNotMetError.new message)
end
end
end
end
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