1 files changed, 33 insertions, 0 deletions
diff --git a/tests/test_serde.py b/tests/test_serde.py
new file mode 100644
index 0000000..603a155
--- /dev/null
+++ b/tests/test_serde.py
@@ -0,0 +1,33 @@
+import json
+import unittest
+
+from sqlglot import exp, parse_one
+from sqlglot.optimizer.annotate_types import annotate_types
+from tests.helpers import load_sql_fixtures
+
+
+class CustomExpression(exp.Expression):
+    ...
+
+
+class TestSerDe(unittest.TestCase):
+    def dump_load(self, expression):
+        return exp.Expression.load(json.loads(json.dumps(expression.dump())))
+
+    def test_serde(self):
+        for sql in load_sql_fixtures("identity.sql"):
+            with self.subTest(sql):
+                before = parse_one(sql)
+                after = self.dump_load(before)
+                self.assertEqual(before, after)
+
+    def test_custom_expression(self):
+        before = CustomExpression()
+        after = self.dump_load(before)
+        self.assertEqual(before, after)
+
+    def test_type_annotations(self):
+        before = annotate_types(parse_one("CAST('1' AS INT)"))
+        after = self.dump_load(before)
+        self.assertEqual(before.type, after.type)
+        self.assertEqual(before.this.type, after.this.type)