Add feature for allowing the body of a request to be matched Closes #716

 (#717)

Add feature for allowing the body of a request to be matched

Fixes #716

responses/matchers.py

@@ -31,6 +31,21 @@ def _filter_dict_recursively(
     return filtered_dict
 
 
+def body_matcher(params: str, *, allow_blank: bool = False) -> Callable[..., Any]:
+    def match(request: PreparedRequest) -> Tuple[bool, str]:
+        reason = ""
+        if isinstance(request.body, bytes):
+            request_body = request.body.decode("utf-8")
+        else:
+            request_body = request.body
+        valid = True if request_body == params else False
+        if not valid:
+            reason = f"request.body doesn't match {params} doesn't match {request_body}"
+        return valid, reason
+
+    return match
+
+
 def urlencoded_params_matcher(
     params: Optional[Mapping[str, str]], *, allow_blank: bool = False
 ) -> Callable[..., Any]:

responses/tests/test_matchers.py

@@ -14,6 +14,40 @@
 from responses.tests.test_responses import assert_response
 
 
+def test_body_match_get():
+    @responses.activate
+    def run():
+        url = "http://example.com"
+        responses.add(
+            responses.GET,
+            url,
+            body=b"test",
+            match=[matchers.body_matcher("123456")],
+        )
+        resp = requests.get("http://example.com", data="123456")
+        assert_response(resp, "test")
+
+    run()
+    assert_reset()
+
+
+def test_body_match_post():
+    @responses.activate
+    def run():
+        url = "http://example.com"
+        responses.add(
+            responses.POST,
+            url,
+            body=b"test",
+            match=[matchers.body_matcher("123456")],
+        )
+        resp = requests.post("http://example.com", data="123456")
+        assert_response(resp, "test")
+
+    run()
+    assert_reset()
+
+
 def test_query_string_matcher():
     @responses.activate
     def run():