mirror of
https://github.com/rails/rails.git
synced 2022-11-09 12:12:34 -05:00
62 lines
2.2 KiB
Ruby
62 lines
2.2 KiB
Ruby
|
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 error message can be specified.
|
||
|
|
#
|
||
|
|
# assert_difference 'Article.count', -1, "An Article should be destroyed" do
|
||
|
|
# post :delete, :id => ...
|
||
|
|
# end
|
||
|
|
def assert_difference(expressions, difference = 1, message = nil, &block)
|
||
|
|
expression_evaluations = Array(expressions).collect{ |expression| lambda { eval(expression, block.send!(:binding)) } }
|
||
|
|
|
||
|
|
original_values = expression_evaluations.inject([]) { |memo, expression| memo << expression.call }
|
||
|
|
yield
|
||
|
|
expression_evaluations.each_with_index do |expression, i|
|
||
|
|
assert_equal original_values[i] + difference, expression.call, message
|
||
|
|
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(expressions, message = nil, &block)
|
||
|
|
assert_difference expressions, 0, message, &block
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|