| Module | ActiveSupport::Testing::Assertions |
| In: |
lib/active_support/testing/assertions.rb
|
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
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