Get rid of unnecessary return statements

lib/rack/mock_session.rb

@@ -23,7 +23,7 @@ def request(uri, env)
       @last_response = MockResponse.new(status, headers, body, env["rack.errors"].flush)
       @cookie_jar = cookie_jar.merge(last_response.headers["Set-Cookie"], uri)
 
-      return @last_response
+      @last_response
     end
 
     # Return the last request issued in the session. Raises an error if no

lib/rack/test.rb

@@ -188,7 +188,7 @@ def process_request(uri, env)
         else
           yield last_response if block_given?
 
-          return last_response
+          last_response
         end
       end
 
@@ -206,7 +206,7 @@ def digest_auth_header
 
         params["response"] = MockDigestRequest.new(params).response(@digest_password)
 
-        return "Digest #{params}"
+        "Digest #{params}"
       end
 
       def retry_with_digest_auth?(env)

lib/rack/test/cookie_jar.rb

@@ -105,7 +105,7 @@ def merge(raw_cookies, uri = nil)
 
         new_jar.concat cookies
 
-        return self.class.new(new_jar)
+        self.class.new(new_jar)
       end
 
       # :api: private