Module: Test::Unit::Assertions
- Defined in:
- lib/active_support/core_ext/test/unit/assertions.rb
Overview
– FIXME: no Proc#binding in Ruby 2, must change this API ++
Instance Method Summary collapse
-
#assert_difference(expressions, difference = 1, message = nil, &block) ⇒ Object
Test numeric difference between the return value of an expression as a result of what is evaluated in the yielded block.
-
#assert_no_difference(expressions, message = nil, &block) ⇒ Object
Assertion that the numeric result of evaluating an expression is not changed before and after invoking the passed in block.
Instance Method Details
#assert_difference(expressions, difference = 1, message = nil, &block) ⇒ Object
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
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# File 'lib/active_support/core_ext/test/unit/assertions.rb', line 37 def assert_difference(expressions, difference = 1, = 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, end end |
#assert_no_difference(expressions, message = nil, &block) ⇒ Object
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
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# File 'lib/active_support/core_ext/test/unit/assertions.rb', line 59 def assert_no_difference(expressions, = nil, &block) assert_difference expressions, 0, , &block end |