assert_no_difference(expression, message = nil, &block)
Instance Public methods
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
An error message can be specified.
assert_no_difference 'Article.count', 'An Article should not be created' do post :create, article: invalid_attributes end
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