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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 <tt>1</tt>.
#
# 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
#
# An 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)
expressions = Array(expression)
exps = expressions.map { |e|
e.respond_to?(:call) ? e : lambda { eval(e, block.binding) }
}
before = exps.map { |e| e.call }
yield
expressions.zip(exps).each_with_index do |(code, e), i|
error = "#{code.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
#
# An error message can be specified.
#
# assert_no_difference 'Article.count', 'An Article should not be created' 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 <tt>object.blank?</tt> is +true+.
#
# assert_blank [] # => true
# assert_blank [[]] # => [[]] is not blank
#
# An error message can be specified.
#
# assert_blank [], 'this should be blank'
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 <tt>if object.present?</tt> is +true+.
#
# assert_present({ data: 'x' }) # => true
# assert_present({}) # => {} is blank
#
# An error message can be specified.
#
# assert_present({ data: 'x' }, 'this should not be blank')
def assert_present(object, message=nil)
message ||= "#{object.inspect} is blank"
assert object.present?, message
end
end
end
end
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