Create json_dumps() method on new EnvironBuilder

CHANGES.rst

@@ -66,6 +66,8 @@ Unreleased
     ensuring nested contexts are cleaned up correctly. :pr:`3157`
 -   Show a better error message when the view return type is not
     supported. :issue:`3214`
+-   ``flask.testing.make_test_environ_builder()`` has been deprecated in
+    favour of a new class ``flask.testing.EnvironBuilder``. :pr:`3232`
 
 .. _#2935: https://github.com/pallets/flask/issues/2935
 .. _#2957: https://github.com/pallets/flask/issues/2957

flask/testing.py

@@ -82,17 +82,17 @@ class EnvironBuilder(werkzeug.test.EnvironBuilder):
                 sep = b"?" if isinstance(url.query, bytes) else "?"
                 path += sep + url.query
 
-        if "json" in kwargs:
-            assert "data" not in kwargs, "Client cannot provide both 'json' and 'data'."
-            kwargs["data"] = self.json_dumps(kwargs.pop("json"), app=app)
-
-            if "content_type" not in kwargs:
-                kwargs["content_type"] = "application/json"
-
-        super(EnvironBuilder, self).__init__(path, base_url, *args, **kwargs)
         self.app = app
+        super(EnvironBuilder, self).__init__(path, base_url, *args, **kwargs)
 
-    json_dumps = staticmethod(json_dumps)
+    def json_dumps(self, obj, **args):
+        """Serialize ``obj`` to a JSON-formatted string.
+
+        The serialization will be configured according to the config associated
+        with this EnvironBuilder's ``app``.
+        """
+        args.setdefault("app", self.app)
+        return json_dumps(obj, **args)
 
 
 def make_test_environ_builder(*args, **kwargs):

tests/test_testing.py

@@ -136,11 +136,6 @@ def test_environbuilder_json_dumps(app):
     assert eb.input_stream.read().decode("utf8") == u'"\u20ac"'
 
 
-def test_environbuilder_json_dumps_static():
-    """EnvironBuilder.json_dumps() can be called as a static method."""
-    assert EnvironBuilder.json_dumps(u"\u20ac") == u'"\\u20ac"'
-
-
 def test_blueprint_with_subdomain():
     app = flask.Flask(__name__, subdomain_matching=True)
     app.config["SERVER_NAME"] = "example.com:1234"