236 lines
7.8 KiB
Ruby
236 lines
7.8 KiB
Ruby
# frozen_string_literal: true
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require "active_support/core_ext/enumerable"
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module ActiveSupport
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module Testing
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module Assertions
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UNTRACKED = Object.new # :nodoc:
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# Asserts 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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# Assertion that the block should not raise an exception.
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#
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# Passes if evaluated code in the yielded block raises no exception.
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#
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# assert_nothing_raised do
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# perform_service(param: 'no_exception')
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# end
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def assert_nothing_raised
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yield
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rescue => error
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raise Minitest::UnexpectedError.new(error)
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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, params: { 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 'Article.last.comments(:reload).size' do
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# post :create, params: { 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, params: { 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, params: { article: {...} }
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# end
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#
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# A hash of expressions/numeric differences can also be passed in and evaluated.
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#
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# assert_difference ->{ Article.count } => 1, ->{ Notification.count } => 2 do
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# post :create, params: { 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, params: { 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, params: { 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, params: { id: ... }
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# end
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def assert_difference(expression, *args, &block)
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expressions =
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if expression.is_a?(Hash)
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message = args[0]
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expression
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else
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difference = args[0] || 1
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message = args[1]
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Array(expression).index_with(difference)
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end
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exps = expressions.keys.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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retval = assert_nothing_raised(&block)
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expressions.zip(exps, before) do |(code, diff), exp, before_value|
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error = "#{code.inspect} didn't change by #{diff}"
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error = "#{message}.\n#{error}" if message
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assert_equal(before_value + diff, exp.call, error)
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end
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retval
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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, params: { article: invalid_attributes }
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# end
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#
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# A lambda can be passed in and evaluated.
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#
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# assert_no_difference -> { Article.count } do
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# post :create, params: { 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, params: { article: invalid_attributes }
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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_no_difference [ 'Article.count', -> { Post.count } ] do
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# post :create, params: { 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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# Assertion that the result of evaluating an expression is changed before
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# and after invoking the passed in block.
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#
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# assert_changes 'Status.all_good?' do
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# post :create, params: { status: { ok: false } }
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# end
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#
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# You can pass the block as a string to be evaluated in the context of
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# the block. A lambda can be passed for the block as well.
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#
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# assert_changes -> { Status.all_good? } do
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# post :create, params: { status: { ok: false } }
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# end
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#
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# The assertion is useful to test side effects. The passed block can be
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# anything that can be converted to string with #to_s.
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#
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# assert_changes :@object do
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# @object = 42
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# end
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#
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# The keyword arguments :from and :to can be given to specify the
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# expected initial value and the expected value after the block was
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# executed.
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#
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# assert_changes :@object, from: nil, to: :foo do
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# @object = :foo
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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_changes -> { Status.all_good? }, 'Expected the status to be bad' do
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# post :create, params: { status: { incident: true } }
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# end
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def assert_changes(expression, message = nil, from: UNTRACKED, to: UNTRACKED, &block)
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exp = expression.respond_to?(:call) ? expression : -> { eval(expression.to_s, block.binding) }
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before = exp.call
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retval = assert_nothing_raised(&block)
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unless from == UNTRACKED
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error = "Expected change from #{from.inspect}"
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error = "#{message}.\n#{error}" if message
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assert from === before, error
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end
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after = exp.call
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error = "#{expression.inspect} didn't change"
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error = "#{error}. It was already #{to}" if before == to
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error = "#{message}.\n#{error}" if message
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assert_not_equal before, after, error
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unless to == UNTRACKED
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error = "Expected change to #{to}\n"
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error = "#{message}.\n#{error}" if message
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assert to === after, error
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end
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retval
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end
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# Assertion that the result of evaluating an expression is not changed before
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# and after invoking the passed in block.
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#
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# assert_no_changes 'Status.all_good?' do
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# post :create, params: { status: { ok: true } }
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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_changes -> { Status.all_good? }, 'Expected the status to be good' do
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# post :create, params: { status: { ok: false } }
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# end
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def assert_no_changes(expression, message = nil, &block)
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exp = expression.respond_to?(:call) ? expression : -> { eval(expression.to_s, block.binding) }
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before = exp.call
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retval = assert_nothing_raised(&block)
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after = exp.call
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error = "#{expression.inspect} changed"
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error = "#{message}.\n#{error}" if message
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if before.nil?
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assert_nil after, error
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else
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assert_equal before, after, error
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end
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retval
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end
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end
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end
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end
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