redirect_to.rb

module RSpec
  module Rails
    module Matchers
      # Matcher for redirects.
      module RedirectTo
        # @private
        class RedirectTo < RSpec::Matchers::BuiltIn::BaseMatcher
          def initialize(scope, expected)
            @expected = expected
            @scope = scope
          end

          def matches?(_)
            match_unless_raises ActiveSupport::TestCase::Assertion do
              @scope.assert_redirected_to(@expected)
            end
          end

          def failure_message
            rescued_exception.message
          end

          def failure_message_when_negated
            "expected not to redirect to #{@expected.inspect}, but did"
          end
        end

        # Delegates to `assert_redirected_to`.
        #
        # @example
        #     expect(response).to redirect_to(:action => "new")
        def redirect_to(target)
          RedirectTo.new(self, target)
        end
      end
    end
  end
end