added regression tests

Author: lharries

posthog/test/test_client.py

@@ -447,3 +447,21 @@ def raise_effect():
         client.feature_flags = [{"key": "example", "is_simple_flag": False}]
 
         self.assertFalse(client.feature_enabled("example", "distinct_id"))
+
+    def test_alias_doesnt_regress_positional_args(self):
+        client = self.client
+        success, msg = client.alias("distinct_id", "alias_id")
+        client.flush()
+        self.assertTrue(success)
+        self.assertFalse(self.failed)
+        self.assertEqual(msg["properties"]["distinct_id"], "distinct_id")
+        self.assertEqual(msg["properties"]["alias"], "alias_id")
+
+    def test_alias_doesnt_regress_named_args(self):
+        client = self.client
+        success, msg = client.alias(distinct_id="distinct_id", previous_id="alias_id")
+        client.flush()
+        self.assertTrue(success)
+        self.assertFalse(self.failed)
+        self.assertEqual(msg["properties"]["distinct_id"], "distinct_id")
+        self.assertEqual(msg["properties"]["alias"], "alias_id")