66 lines
2.2 KiB
Ruby
66 lines
2.2 KiB
Ruby
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module ActiveSupport
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module Testing
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module Assertions
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# Test numeric difference between the return value of an expression as a result of what is evaluated
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# in the yielded block.
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#
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# assert_difference 'Article.count' do
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# post :create, :article => {...}
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# end
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#
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# An arbitrary expression is passed in and evaluated.
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#
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# assert_difference 'assigns(:article).comments(:reload).size' do
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# post :create, :comment => {...}
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# end
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#
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# An arbitrary positive or negative difference can be specified. The default is +1.
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#
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# assert_difference 'Article.count', -1 do
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# post :delete, :id => ...
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# end
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#
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# An array of expressions can also be passed in and evaluated.
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#
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# assert_difference [ 'Article.count', 'Post.count' ], +2 do
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# post :create, :article => {...}
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# end
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#
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# A error message can be specified.
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#
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# assert_difference 'Article.count', -1, "An Article should be destroyed" do
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# post :delete, :id => ...
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# end
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def assert_difference(expression, difference = 1, message = nil, &block)
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b = block.send(:binding)
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exps = Array.wrap(expression)
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before = exps.map { |e| eval(e, b) }
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yield
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exps.each_with_index do |e, i|
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error = "#{e.inspect} didn't change by #{difference}"
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error = "#{message}.\n#{error}" if message
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assert_equal(before[i] + difference, eval(e, b), error)
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end
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end
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# Assertion that the numeric result of evaluating an expression is not changed before and after
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# invoking the passed in block.
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#
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# assert_no_difference 'Article.count' do
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# post :create, :article => invalid_attributes
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# end
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#
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# A error message can be specified.
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#
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# assert_no_difference 'Article.count', "An Article should not be destroyed" do
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# post :create, :article => invalid_attributes
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# end
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def assert_no_difference(expression, message = nil, &block)
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assert_difference expression, 0, message, &block
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end
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end
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end
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end
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