fix(tests): on python 3.8

tests/test_serializable.py

@@ -0,0 +1,39 @@
+import sys
+from dataclasses import dataclass
+
+from mashumaro import DataClassDictMixin
+
+from mutapath import Path
+from tests.helper import PathTest
+
+if sys.version_info == (3, 7):
+    @dataclass
+    class DataClass(DataClassDictMixin):
+        path: Path = Path()
+
+
+    class TestSerialization(PathTest):
+        def test_empty_serialization(self):
+            expected = {'path': ''}
+            actual = DataClass().to_dict()
+            self.assertEqual(expected, actual)
+
+        def test_serialization(self):
+            expected = {'path': "/A/B/test1.txt"}
+            actual = DataClass(Path("/A/B/test1.txt", posix=True)).to_dict()
+            self.assertEqual(expected, actual)
+
+        def test_empty_deserialization(self):
+            expected = DataClass()
+            actual = DataClass().from_dict({'path': ''})
+            self.assertEqual(expected, actual)
+
+        def test_deserialization(self):
+            expected = DataClass(Path("/A/B/test1.txt", posix=True))
+            actual = DataClass().from_dict({'path': "/A/B/test1.txt"})
+            self.assertEqual(expected, actual)
+
+        def test_deserialization_static(self):
+            expected = DataClass(Path("/A/B/test1.txt", posix=True))
+            actual = DataClass.from_dict({'path': "/A/B/test1.txt"})
+            self.assertEqual(expected, actual)