Files

RSpec::Expectations

RSpec::Expectations adds two instance methods to every object:

should(matcher=nil)
should_not(matcher=nil)

Both methods take an optional matcher object (See [RSpec::Matchers](../RSpec/Matchers)). When `should` is invoked with a matcher, it turns around and calls `matcher.matches?(self)`. For example, in the expression:

order.total.should eq(Money.new(5.55, :USD))

the `should` method invokes the equivalent of `eq.matches?(order.total)`. If `matches?` returns true, the expectation is met and execution continues. If `false`, then the spec fails with the message returned by `eq.failure_message_for_should`.

Given the expression:

order.entries.should_not include(entry)

the `should_not` method invokes the equivalent of `include.matches?(order.entries)`, but it interprets `false` as success, and `true` as a failure, using the message generated by `eq.failure_message_for_should_not`.

rspec-expectations ships with a standard set of useful matchers, and writing your own matchers is quite simple.

See [RSpec::Matchers](../RSpec/Matchers) for more information about the built-in matchers that ship with rspec-expectations, and how to write your own custom matchers.

Public Class Methods

differ() click to toggle source

@private

# File lib/rspec/expectations/fail_with.rb, line 5
def differ
  @differ ||= Differ.new
end
fail_with(message, expected=nil, actual=nil) click to toggle source

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.

# File lib/rspec/expectations/fail_with.rb, line 16
def fail_with(message, expected=nil, actual=nil)
  if !message
    raise ArgumentError, "Failure message is nil. Does your matcher define the " +
                         "appropriate failure_message_for_* method to return a string?"
  end

  if actual && expected
    if all_strings?(actual, expected)
      if any_multiline_strings?(actual, expected)
        message << "\nDiff:" << differ.diff_as_string(actual, expected)
      end
    elsif no_procs?(actual, expected) && no_numbers?(actual, expected)
      message << "\nDiff:" << differ.diff_as_object(actual, expected)
    end
  end

  raise(RSpec::Expectations::ExpectationNotMetError.new(message))
end

Public Instance Methods

differ=(ignore) click to toggle source

@deprecated (no replacement)

# File lib/rspec/expectations/extensions/object.rb, line 33
def differ=(ignore)
  RSpec.deprecate("RSpec::Expectations.differ=(differ)", "nothing at all (diffing is now automatic and no longer configurable)")
end

[Validate]

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