Added tests for extract_meta functions and top level meta objects

Author: jerel

example/tests/integration/test_meta.py

@@ -7,7 +7,7 @@
 pytestmark = pytest.mark.django_db
 
 
-def test_top_level_data_meta(blog, client):
+def test_top_level_meta(blog, client):
 
     expected = {
         "data": {
@@ -20,6 +20,9 @@ def test_top_level_data_meta(blog, client):
                 "copyright": datetime.now().year
             },
         },
+        "meta": {
+            "apiDocs": "/docs/api/blogs"
+        },
     }
 
     response = client.get(reverse("blog-detail", kwargs={'pk': blog.pk}))

example/tests/unit/test_renderer_class_methods.py

@@ -7,8 +7,12 @@
 pytestmark = pytest.mark.django_db
 
 class ResourceSerializer(serializers.ModelSerializer):
+    version = serializers.SerializerMethodField()
+    def get_version(self, obj):
+        return '1.0.0'
     class Meta:
         fields = ('username',)
+        meta_fields = ('version',)
         model = get_user_model()
 
 
@@ -48,3 +52,47 @@ def test_extract_attributes():
     assert sorted(JSONRenderer.extract_attributes(fields, resource)) == sorted(expected), 'Regular fields should be extracted'
     assert sorted(JSONRenderer.extract_attributes(fields, {})) == sorted(
         {'username': ''}), 'Should not extract read_only fields on empty serializer'
+
+def test_extract_meta():
+    serializer = ResourceSerializer(data={'username': 'jerel', 'version':'1.0.0'})
+    serializer.is_valid()
+    expected = {
+        'version': '1.0.0',
+    }
+    assert JSONRenderer.extract_meta(serializer, serializer.data) == expected
+
+def test_extract_root_meta():
+    def get_root_meta(obj):
+        return {
+            'foo': 'meta-value'
+        }
+
+    serializer = ResourceSerializer()
+    serializer.get_root_meta = get_root_meta
+    expected = {
+        'foo': 'meta-value',
+    }
+    assert JSONRenderer.extract_root_meta(serializer, {}, {}) == expected
+
+def test_extract_root_meta_many():
+    def get_root_meta(obj):
+        return {
+          'foo': 'meta-value'
+        }
+
+    serializer = ResourceSerializer(many=True)
+    serializer.get_root_meta = get_root_meta
+    expected = {
+      'foo': 'meta-value'
+    }
+    assert JSONRenderer.extract_root_meta(serializer, {}, {}) == expected
+
+def test_extract_root_meta_invalid_meta():
+    def get_root_meta(obj):
+        return 'not a dict'
+
+    serializer = ResourceSerializer()
+    serializer.get_root_meta = get_root_meta
+    with pytest.raises(AssertionError) as e_info:
+        JSONRenderer.extract_root_meta(serializer, {}, {})
+