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97 lines
3.2 KiB
Ruby
97 lines
3.2 KiB
Ruby
require 'active_support/core_ext/object/blank'
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module ActiveSupport
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module Testing
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module Assertions
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# Assert that an expression is not truthy. Passes if <tt>object</tt> is
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# +nil+ or +false+. "Truthy" means "considered true in a conditional"
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# like <tt>if foo</tt>.
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#
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# assert_not nil # => true
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# assert_not false # => true
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# assert_not 'foo' # => Expected "foo" to be nil or false
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#
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# An error message can be specified.
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#
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# assert_not foo, 'foo should be false'
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def assert_not(object, message = nil)
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message ||= "Expected #{mu_pp(object)} to be nil or false"
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assert !object, message
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end
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# Test numeric difference between the return value of an expression as a
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# result of what is evaluated in the yielded block.
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#
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# assert_difference 'Article.count' do
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# post :create, article: {...}
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# end
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#
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# An arbitrary expression is passed in and evaluated.
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#
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# assert_difference 'assigns(:article).comments(:reload).size' do
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# post :create, comment: {...}
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# end
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#
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# An arbitrary positive or negative difference can be specified.
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# The default is <tt>1</tt>.
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#
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# assert_difference 'Article.count', -1 do
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# post :delete, id: ...
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# end
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#
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# An array of expressions can also be passed in and evaluated.
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#
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# assert_difference [ 'Article.count', 'Post.count' ], 2 do
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# post :create, article: {...}
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# end
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#
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# A lambda or a list of lambdas can be passed in and evaluated:
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#
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# assert_difference ->{ Article.count }, 2 do
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# post :create, article: {...}
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# end
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#
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# assert_difference [->{ Article.count }, ->{ Post.count }], 2 do
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# post :create, article: {...}
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# end
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#
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# An error message can be specified.
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#
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# assert_difference 'Article.count', -1, 'An Article should be destroyed' do
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# post :delete, id: ...
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# end
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def assert_difference(expression, difference = 1, message = nil, &block)
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expressions = Array(expression)
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exps = expressions.map { |e|
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e.respond_to?(:call) ? e : lambda { eval(e, block.binding) }
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}
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before = exps.map(&:call)
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yield
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expressions.zip(exps).each_with_index do |(code, e), i|
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error = "#{code.inspect} didn't change by #{difference}"
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error = "#{message}.\n#{error}" if message
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assert_equal(before[i] + difference, e.call, error)
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end
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end
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# Assertion that the numeric result of evaluating an expression is not
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# changed before and after invoking the passed in block.
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#
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# assert_no_difference 'Article.count' do
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# post :create, article: invalid_attributes
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# end
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#
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# An error message can be specified.
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#
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# assert_no_difference 'Article.count', 'An Article should not be created' do
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# post :create, article: invalid_attributes
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# end
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def assert_no_difference(expression, message = nil, &block)
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assert_difference expression, 0, message, &block
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end
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end
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end
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end
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