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module AE
require 'ae/assertor'
# = Expect
#
# "When love and skill work together, expect a masterpiece."
# --John Ruskin (1819 - 1900)
#
module Expect
# The #expect method is a convenient tool for defining
# certain sets of expectations in your specifications.
#
# Expect is used to expect a result from a block of code.
# If the argument to expect is a subclass of Exception
# or instance thereof, then the block is monitored for
# the raising of such an exception.
#
# expect StandardError do
# raise ArgumentError
# end
#
# All other expectations are compared using case equality (#===).
# This allows one to verify matching Regexp.
#
# expect /x/ do
# "x"
# end
#
# As well as checking that an object is an instance of a given Class.
#
# expect String do
# "x"
# end
#
# Like #assert it can be used to designate an expectation
# via a *functor*.
#
# 4.expect == 3
#
def expect(*args, &block)
Assertor.new(self, :backtrace=>caller).expect(*args, &block)
end
# Designate a negated expectation. Read this as "expect not".
#
# See #expect.
#
def expect!(*args, &block)
Assertor.new(self, :backtrace=>caller).not.expect(*args, &block)
end
# Alias for #expect! method.
alias_method :forbid, :expect!
# Like #expect but uses the reciever as the object
# of expectation.
#
# @example
# /x/.expected do
# "oooxooo"
# end
#
def expected(*args, &block)
expect(self, *args, &block)
end
end
end
# Copyright (c) 2008 Thomas Sawyer
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