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Added assert_difference and assert_no_difference to test/unit assertions

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6647 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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commit 8f5c83bdeac2d345f3ec55ecb6460a76c4450a48 1 parent 04fd94d
Tobias Lütke authored
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2  activesupport/CHANGELOG
@@ -1,5 +1,7 @@
*SVN*
+* Added assert_difference and assert_no_difference to test/unit assertions [Tobias Luetke]
+
* Removed breakpointer and Binding.of_caller in favor of relying on ruby-debug by Kent Sibilev since the breakpointer has been broken since Ruby 1.8.4 and will not be coming back [DHH]
* Added parsing of file type in Hash.xml_in so you can easily do file uploads with base64 from an API [DHH]
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1  activesupport/lib/active_support.rb
@@ -43,3 +43,4 @@
require 'active_support/json'
require 'active_support/multibyte'
+
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2  activesupport/lib/active_support/core_ext/test.rb
@@ -0,0 +1,2 @@
+require File.dirname(__FILE__) + '/test/difference'
+
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29 activesupport/lib/active_support/core_ext/test/difference.rb
@@ -0,0 +1,29 @@
+
+module Test #:nodoc:
+ module Unit #:nodoc:
+ class TestCase #:nodoc:
+
+ # Test difference between the return value of method on object for duration of the block
+ def assert_difference(objects, method = nil, difference = 1)
+ objects = [objects].flatten
+ initial_values = objects.inject([]) { |sum,obj| sum << obj.send(method) }
+ yield
+ if difference.nil?
+ objects.each_with_index { |obj,i|
+ assert_not_equal initial_values[i], obj.send(method), "#{obj}##{method}"
+ }
+ else
+ objects.each_with_index { |obj,i|
+ assert_equal initial_values[i] + difference, obj.send(method), "#{obj}##{method}"
+ }
+ end
+ end
+
+ # Test absence of difference between the return value of method on object for duration of the block
+ def assert_no_difference(objects, method = nil, &block)
+ assert_difference objects, method, 0, &block
+ end
+
+ end
+ end
+end
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34 activesupport/test/test_test.rb
@@ -0,0 +1,34 @@
+require File.dirname(__FILE__) + '/abstract_unit'
+
+class AssertDifferenceTest < Test::Unit::TestCase
+
+ def setup
+ @object = Class.new { attr_accessor :num }.new
+ end
+
+ def test_assert_no_difference
+ @object.num = 0
+
+ assert_no_difference @object, :num do
+ # ...
+ end
+
+ end
+ def test_assert_difference
+ @object.num = 0
+
+
+ assert_difference @object, :num, +1 do
+ @object.num = 1
+ end
+
+ end
+
+ def test_methods_available
+
+ assert self.respond_to?(:assert_difference)
+ assert self.respond_to?(:assert_no_difference)
+
+ end
+
+end
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