Test if an expression is blank. Passes if object.blank? is true.
assert_blank [] # => true
# File lib/active_support/testing/assertions.rb, line 83 83: def assert_blank(object, message=nil) 84: message ||= "#{object.inspect} is not blank" 85: assert object.blank?, message 86: end
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 lambda or a list of lambdas can be passed in and evaluated:
assert_difference lambda { Article.count }, 2 do post :create, :article => {...} end 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 47 47: def assert_difference(expression, difference = 1, message = nil, &block) 48: expressions = Array.wrap expression 49: 50: exps = expressions.map { |e| 51: e.respond_to?(:call) ? e : lambda { eval(e, block.binding) } 52: } 53: before = exps.map { |e| e.call } 54: 55: yield 56: 57: expressions.zip(exps).each_with_index do |(code, e), i| 58: error = "#{code.inspect} didn't change by #{difference}" 59: error = "#{message}.\n#{error}" if message 60: assert_equal(before[i] + difference, e.call, error) 61: end 62: 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 created" do post :create, :article => invalid_attributes end
# File lib/active_support/testing/assertions.rb, line 76 76: def assert_no_difference(expression, message = nil, &block) 77: assert_difference expression, 0, message, &block 78: end
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 91 91: def assert_present(object, message=nil) 92: message ||= "#{object.inspect} is blank" 93: assert object.present?, message 94: end
Disabled; run with --debug to generate this.
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