assert_no_emails(&block) public

Assert that no emails have been sent.

def test_emails
  assert_no_emails
  ContactMailer.deliver_contact
  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
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