1 files changed, 49 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/testing/assertion_response.rb b/actionpack/lib/action_dispatch/testing/assertion_response.rb
new file mode 100644
index 0000000000..3fb81ff083
--- /dev/null
+++ b/actionpack/lib/action_dispatch/testing/assertion_response.rb
@@ -0,0 +1,49 @@
+module ActionDispatch
+  # This is a class that abstracts away an asserted response.
+  # It purposely does not inherit from Response, because it doesn't need it.
+  # That means it does not have headers or a body.
+  #
+  # As an input to the initializer, we take a Fixnum, a String, or a Symbol.
+  # If it's a Fixnum or String, we figure out what its symbolized name.
+  # If it's a Symbol, we figure out what its corresponding code is.
+  # The resulting code will be a Fixnum, for real HTTP codes, and it will
+  # be a String for the pseudo-HTTP codes, such as:
+  #   :success, :missing, :redirect and :error
+  class AssertionResponse
+    attr_reader :code, :name
+
+    GENERIC_RESPONSE_CODES = { # :nodoc:
+      success: "2XX",
+      missing: "404",
+      redirect: "3XX",
+      error: "5XX"
+    }
+
+    def initialize(code_or_name)
+      if code_or_name.is_a?(Symbol)
+        @name = code_or_name
+        @code = code_from_name(code_or_name)
+      else
+        @name = name_from_code(code_or_name)
+        @code = code_or_name
+      end
+
+      raise ArgumentError, "Invalid response name: #{name}" if @code.nil?
+      raise ArgumentError, "Invalid response code: #{code}" if @name.nil?
+    end
+
+    def code_and_name
+      "#{code}: #{name}"
+    end
+
+    private
+
+    def code_from_name(name)
+      GENERIC_RESPONSE_CODES[name] || Rack::Utils::SYMBOL_TO_STATUS_CODE[name]
+    end
+
+    def name_from_code(code)
+      GENERIC_RESPONSE_CODES.invert[code] || Rack::Utils::HTTP_STATUS_CODES[code]
+    end
+  end
+end