Check for redundant on SerializerMethodField

1 files changed, 30 insertions, 0 deletions

diff --git a/tests/test_fields.py b/tests/test_fields.py
index ebb88d3d..003b4b8c 100644
--- a/tests/test_fields.py
+++ b/tests/test_fields.py
@@ -710,3 +710,33 @@ class TestMultipleChoiceField(FieldValues):
             ('diesel', 'Diesel'),
         ]
     )
+
+
+# Tests for SerializerMethodField.
+# --------------------------------
+
+class TestSerializerMethodField:
+    def test_serializer_method_field(self):
+        class ExampleSerializer(serializers.Serializer):
+            example_field = serializers.SerializerMethodField()
+
+            def get_example_field(self, obj):
+                return 'ran get_example_field(%d)' % obj['example_field']
+
+        serializer = ExampleSerializer({'example_field': 123})
+        assert serializer.data == {
+            'example_field': 'ran get_example_field(123)'
+        }
+
+    def test_redundant_method_name(self):
+        class ExampleSerializer(serializers.Serializer):
+            example_field = serializers.SerializerMethodField('get_example_field')
+
+        with pytest.raises(AssertionError) as exc_info:
+            ExampleSerializer()
+        assert str(exc_info.value) == (
+            "It is redundant to specify `get_example_field` on "
+            "SerializerMethodField 'example_field' in serializer "
+            "'ExampleSerializer', because it is the same as the default "
+            "method name. Remove the `method_name` argument."
+        )