✨ Add main GenericSchema class

tests/test_schema.py

@@ -0,0 +1,37 @@
+from unittest import TestCase
+from unittest.mock import MagicMock, patch
+
+from marshmallow_generic import _util, schema
+
+
+class GenericSchemaTestCase(TestCase):
+    @patch.object(_util.GenericInsightMixin, "_get_type_arg")
+    def test_instantiate(self, mock__get_type_arg: MagicMock) -> None:
+        mock__get_type_arg.return_value = mock_cls = MagicMock()
+        mock_data = {"foo": "bar", "spam": 123}
+
+        class Foo:
+            pass
+
+        schema_obj = schema.GenericSchema[Foo]()
+        # Explicit annotation to possibly catch mypy errors:
+        output: Foo = schema_obj.instantiate(mock_data)
+        self.assertIs(mock_cls.return_value, output)
+        mock__get_type_arg.assert_called_once_with()
+        mock_cls.assert_called_once_with(**mock_data)
+
+    def test_load(self) -> None:
+        """Mainly for static type checking purposes."""
+
+        class Foo:
+            pass
+
+        class TestSchema(schema.GenericSchema[Foo]):
+            pass
+
+        single: Foo = TestSchema().load({})
+        self.assertIsInstance(single, Foo)
+
+        multiple: list[Foo] = TestSchema().load([{}], many=True)
+        self.assertIsInstance(multiple, list)
+        self.assertIsInstance(multiple[0], Foo)