Fixed bug in `respond_200`

tests/wbemocks.py

@@ -146,10 +146,10 @@ class socket:
         cls.URLs[url] = [method, response, body]
 
     @classmethod
-    def respond_200(cls, url, body, **kwargs):
+    def respond_200(cls, url, response_body, **kwargs):
         response = ("HTTP/1.0 200 OK\r\n" +
                     "\r\n" +
-                    body).encode()
+                    response_body).encode()
         cls.respond(url, response, **kwargs)
 
     @classmethod