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module ActionMailer
# Provides helper methods for testing Action Mailer, including #assert_emails
# and #assert_no_emails
module TestHelper
# Asserts that the number of emails sent matches the given number.
#
# def test_emails
# assert_emails 0
# ContactMailer.welcome.deliver_now
# assert_emails 1
# ContactMailer.welcome.deliver_now
# assert_emails 2
# end
#
# If a block is passed, that block should cause the specified number of
# emails to be sent.
#
# def test_emails_again
# assert_emails 1 do
# ContactMailer.welcome.deliver_now
# end
#
# assert_emails 2 do
# ContactMailer.welcome.deliver_now
# ContactMailer.welcome.deliver_now
# end
# end
def assert_emails(number)
if block_given?
original_count = ActionMailer::Base.deliveries.size
yield
new_count = ActionMailer::Base.deliveries.size
assert_equal original_count + number, new_count, "#{number} emails expected, but #{new_count - original_count} were sent"
else
assert_equal number, ActionMailer::Base.deliveries.size
end
end
# Assert that no emails have been sent.
#
# def test_emails
# assert_no_emails
# ContactMailer.welcome.deliver_now
# assert_emails 1
# end
#
# If a block is passed, that block should not cause any emails to be sent.
#
# def test_emails_again
# assert_no_emails do
# # No emails should be sent from this block
# end
# end
#
# Note: This assertion is simply a shortcut for:
#
# assert_emails 0
def assert_no_emails(&block)
assert_emails 0, &block
end
end
end
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