Add test for reusing an existing dataclass

datafiles/tests/test_decorators.py

@@ -0,0 +1,24 @@
+# pylint: disable=unused-variable
+
+from dataclasses import dataclass, is_dataclass
+
+from datafiles import decorators
+
+
+def describe_datafile():
+    def it_turns_normal_class_into_dataclass(expect):
+        class Normal:
+            pass
+
+        cls = decorators.datafile("")(Normal)
+
+        expect(is_dataclass(cls)) == True
+
+    def it_can_reuse_existing_dataclass(expect):
+        @dataclass
+        class Existing:
+            pass
+
+        cls = decorators.datafile("")(Existing)
+
+        expect(id(cls)) == id(Existing)