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module RSpec
module Matchers
module BuiltIn
# @api private
# Provides the implementation for `exist`.
# Not intended to be instantiated directly.
class Exist < BaseMatcher
def initialize(*expected)
@expected = expected
end
# @api private
# @return [Boolean]
def matches?(actual)
@actual = actual
@test = ExistenceTest.new @actual, @expected
@test.valid_test? && @test.actual_exists?
end
# @api private
# @return [Boolean]
def does_not_match?(actual)
@actual = actual
@test = ExistenceTest.new @actual, @expected
@test.valid_test? && !@test.actual_exists?
end
# @api private
# @return [String]
def failure_message
"expected #{actual_formatted} to exist#{@test.validity_message}"
end
# @api private
# @return [String]
def failure_message_when_negated
"expected #{actual_formatted} not to exist#{@test.validity_message}"
end
# @api private
# Simple class for memoizing actual/expected for this matcher
# and examining the match
class ExistenceTest < Struct.new(:actual, :expected)
# @api private
# @return [Boolean]
def valid_test?
uniq_truthy_values.size == 1
end
# @api private
# @return [Boolean]
def actual_exists?
existence_values.first
end
# @api private
# @return [String]
def validity_message
case uniq_truthy_values.size
when 0
" but it does not respond to either `exist?` or `exists?`"
when 2
" but `exist?` and `exists?` returned different values:\n\n"\
" exist?: #{existence_values.first}\n"\
"exists?: #{existence_values.last}"
end
end
private
def uniq_truthy_values
@uniq_truthy_values ||= existence_values.map { |v| !!v }.uniq
end
def existence_values
@existence_values ||= predicates.map { |p| actual.__send__(p, *expected) }
end
def predicates
@predicates ||= [:exist?, :exists?].select { |p| actual.respond_to?(p) && !deprecated(p, actual) }
end
def deprecated(predicate, actual)
predicate == :exists? && (File == actual || FileTest == actual || Dir == actual)
end
end
end
end
end
end
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