added RSpec and RSpec on Rails

[rails.git] / vendor / gems / rspec-1.1.2 / lib / spec / expectations.rb

diff --git a/vendor/gems/rspec-1.1.2/lib/spec/expectations.rb b/vendor/gems/rspec-1.1.2/lib/spec/expectations.rb
new file mode 100644 (file)
index 0000000..65ea474
--- /dev/null
+++ b/vendor/gems/rspec-1.1.2/lib/spec/expectations.rb
@@ -0,0 +1,56 @@
+require 'spec/matchers'
+require 'spec/expectations/errors'
+require 'spec/expectations/extensions'
+require 'spec/expectations/handler'
+
+module Spec
+  
+  # Spec::Expectations lets you set expectations on your objects.
+  #
+  #   result.should == 37
+  #   team.should have(11).players_on_the_field
+  #
+  # == How Expectations work.
+  #
+  # Spec::Expectations adds two methods to Object:
+  #
+  #   should(matcher=nil)
+  #   should_not(matcher=nil)
+  #
+  # Both methods take an optional Expression Matcher (See Spec::Matchers).
+  #
+  # When +should+ receives an Expression Matcher, it calls <tt>matches?(self)</tt>. If
+  # it returns +true+, the spec passes and execution continues. If it returns
+  # +false+, then the spec fails with the message returned by <tt>matcher.failure_message</tt>.
+  #
+  # Similarly, when +should_not+ receives a matcher, it calls <tt>matches?(self)</tt>. If
+  # it returns +false+, the spec passes and execution continues. If it returns
+  # +true+, then the spec fails with the message returned by <tt>matcher.negative_failure_message</tt>.
+  #
+  # RSpec ships with a standard set of useful matchers, and writing your own
+  # matchers is quite simple. See Spec::Matchers for details.
+  module Expectations
+    class << self
+      attr_accessor :differ
+
+      # raises a Spec::Expectations::ExpectationNotMetError with message
+      #
+      # When a differ has been assigned and fail_with is passed
+      # <code>expected</code> and <code>target</code>, passes them
+      # to the differ to append a diff message to the failure message.
+      def fail_with(message, expected=nil, target=nil) # :nodoc:
+        if Array === message && message.length == 3
+          message, expected, target = message[0], message[1], message[2]
+        end
+        unless (differ.nil? || expected.nil? || target.nil?)
+          if expected.is_a?(String)
+            message << "\nDiff:" << self.differ.diff_as_string(target.to_s, expected)
+          elsif !target.is_a?(Proc)
+            message << "\nDiff:" << self.differ.diff_as_object(target, expected)
+          end
+        end
+        Kernel::raise(Spec::Expectations::ExpectationNotMetError.new(message))
+      end
+    end
+  end
+end