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author | David Heinemeier Hansson <david@loudthinking.com> | 2008-07-16 17:45:28 -0500 |
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committer | David Heinemeier Hansson <david@loudthinking.com> | 2008-07-16 17:45:28 -0500 |
commit | 73ade4fe100ae7f48c5f95dcdf7067f6a0cd51fa (patch) | |
tree | 2f1601292978a844226e16f3cef428ed760b9eb5 /activesupport/lib/active_support/testing/core_ext/test | |
parent | 8fe01de2e8753d045408ecde3178ab4e9192bf9a (diff) | |
parent | 90c930f45c5c6766306929241462ffff8f67b86e (diff) | |
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Resolved conflict
Diffstat (limited to 'activesupport/lib/active_support/testing/core_ext/test')
-rw-r--r-- | activesupport/lib/active_support/testing/core_ext/test/unit/assertions.rb | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/testing/core_ext/test/unit/assertions.rb b/activesupport/lib/active_support/testing/core_ext/test/unit/assertions.rb new file mode 100644 index 0000000000..70a44eab8c --- /dev/null +++ b/activesupport/lib/active_support/testing/core_ext/test/unit/assertions.rb @@ -0,0 +1,65 @@ +require 'test/unit/assertions' +module Test + module Unit + #-- + # FIXME: no Proc#binding in Ruby 2, must change this API + #++ + module Assertions + # Test numeric difference between the return value of an expression as a result of what is evaluated + # in the yielded block. + # + # assert_difference 'Article.count' do + # post :create, :article => {...} + # end + # + # An arbitrary expression is passed in and evaluated. + # + # assert_difference 'assigns(:article).comments(:reload).size' do + # post :create, :comment => {...} + # end + # + # An arbitrary positive or negative difference can be specified. The default is +1. + # + # assert_difference 'Article.count', -1 do + # post :delete, :id => ... + # end + # + # An array of expressions can also be passed in and evaluated. + # + # assert_difference [ 'Article.count', 'Post.count' ], +2 do + # post :create, :article => {...} + # end + # + # A error message can be specified. + # + # assert_difference 'Article.count', -1, "An Article should be destroyed" do + # post :delete, :id => ... + # end + def assert_difference(expressions, difference = 1, message = nil, &block) + expression_evaluations = Array(expressions).collect{ |expression| lambda { eval(expression, block.send!(:binding)) } } + + original_values = expression_evaluations.inject([]) { |memo, expression| memo << expression.call } + yield + expression_evaluations.each_with_index do |expression, i| + assert_equal original_values[i] + difference, expression.call, message + end + end + + # Assertion that the numeric result of evaluating an expression is not changed before and after + # invoking the passed in block. + # + # assert_no_difference 'Article.count' do + # post :create, :article => invalid_attributes + # end + # + # A error message can be specified. + # + # assert_no_difference 'Article.count', "An Article should not be destroyed" do + # post :create, :article => invalid_attributes + # end + def assert_no_difference(expressions, message = nil, &block) + assert_difference expressions, 0, message, &block + end + end + end +end |