Module: ActiveSupport::Testing::Assertions

assert_blank(object, message=nil) click to toggle source

Test if an expression is blank. Passes if object.blank? is true.

  assert_blank [] # => true

    # File lib/active_support/testing/assertions.rb, line 70
70:       def assert_blank(object, message=nil)
71:         message ||= "#{object.inspect} is not blank"
72:         assert object.blank?, message
73:       end

assert_difference(expression, difference = 1, message = nil, &block) click to toggle source

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

    # File lib/active_support/testing/assertions.rb, line 37
37:       def assert_difference(expression, difference = 1, message = nil, &block)
38:         b = block.send(:binding)
39:         exps = Array.wrap(expression)
40:         before = exps.map { |e| eval(e, b) }
41: 
42:         yield
43: 
44:         exps.each_with_index do |e, i|
45:           error = "#{e.inspect} didn't change by #{difference}"
46:           error = "#{message}.\n#{error}" if message
47:           assert_equal(before[i] + difference, eval(e, b), error)
48:         end
49:       end

assert_no_difference(expression, message = nil, &block) click to toggle source

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

    # File lib/active_support/testing/assertions.rb, line 63
63:       def assert_no_difference(expression, message = nil, &block)
64:         assert_difference expression, 0, message, &block
65:       end

assert_present(object, message=nil) click to toggle source

Test if an expression is not blank. Passes if object.present? is true.

  assert_present {:data => 'x' } # => true

    # File lib/active_support/testing/assertions.rb, line 78
78:       def assert_present(object, message=nil)
79:         message ||= "#{object.inspect} is blank"
80:         assert object.present?, message
81:       end

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