mirror of
https://github.com/rails/rails.git
synced 2022-11-09 12:12:34 -05:00
95 lines
3.2 KiB
Ruby
95 lines
3.2 KiB
Ruby
require 'active_support/core_ext/array/wrap'
|
|
require 'active_support/core_ext/object/blank'
|
|
|
|
module ActiveSupport
|
|
module Testing
|
|
module Assertions
|
|
# 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
|
|
def assert_difference(expression, difference = 1, message = nil, &block)
|
|
exps = Array.wrap(expression).map { |e|
|
|
e.respond_to?(:call) ? e : lambda { eval(e, block.binding) }
|
|
}
|
|
before = exps.map { |e| e.call }
|
|
|
|
yield
|
|
|
|
exps.each_with_index do |e, i|
|
|
error = "#{e.inspect} didn't change by #{difference}"
|
|
error = "#{message}.\n#{error}" if message
|
|
assert_equal(before[i] + difference, e.call, error)
|
|
end
|
|
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 destroyed" do
|
|
# post :create, :article => invalid_attributes
|
|
# end
|
|
def assert_no_difference(expression, message = nil, &block)
|
|
assert_difference expression, 0, message, &block
|
|
end
|
|
|
|
# Test if an expression is blank. Passes if object.blank? is true.
|
|
#
|
|
# assert_blank [] # => true
|
|
def assert_blank(object, message=nil)
|
|
message ||= "#{object.inspect} is not blank"
|
|
assert object.blank?, message
|
|
end
|
|
|
|
# Test if an expression is not blank. Passes if object.present? is true.
|
|
#
|
|
# assert_present {:data => 'x' } # => true
|
|
def assert_present(object, message=nil)
|
|
message ||= "#{object.inspect} is blank"
|
|
assert object.present?, message
|
|
end
|
|
end
|
|
end
|
|
end
|