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assert_no_difference

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

Links:

https://github.com/rails/rails/blob/74ebc451c92f1788f6689f085490f8a5156dde4e/activesupport/lib/active_support/testing/assertions.rb#L92

doc_ruby_on_rails

2025-01-10 15:47:30

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