1 files changed, 138 insertions, 2 deletions
diff --git a/tests/test_lineage.py b/tests/test_lineage.py
index 7a48605..1d13dd3 100644
--- a/tests/test_lineage.py
+++ b/tests/test_lineage.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import unittest
 
 from sqlglot.lineage import lineage
@@ -9,12 +11,146 @@ class TestLineage(unittest.TestCase):
     def test_lineage(self) -> None:
         node = lineage(
             "a",
-            "SELECT a FROM y",
+            "SELECT a FROM z",
             schema={"x": {"a": "int"}},
-            sources={"y": "SELECT * FROM x"},
+            sources={"y": "SELECT * FROM x", "z": "SELECT a FROM y"},
         )
         self.assertEqual(
             node.source.sql(),
+            "SELECT z.a AS a FROM (SELECT y.a AS a FROM (SELECT x.a AS a FROM x AS x) AS y /* source: y */) AS z /* source: z */",
+        )
+        self.assertEqual(node.alias, "")
+
+        downstream = node.downstream[0]
+        self.assertEqual(
+            downstream.source.sql(),
             "SELECT y.a AS a FROM (SELECT x.a AS a FROM x AS x) AS y /* source: y */",
         )
+        self.assertEqual(downstream.alias, "z")
+
+        downstream = downstream.downstream[0]
+        self.assertEqual(
+            downstream.source.sql(),
+            "SELECT x.a AS a FROM x AS x",
+        )
+        self.assertEqual(downstream.alias, "y")
         self.assertGreater(len(node.to_html()._repr_html_()), 1000)
+
+    def test_lineage_sql_with_cte(self) -> None:
+        node = lineage(
+            "a",
+            "WITH z AS (SELECT a FROM y) SELECT a FROM z",
+            schema={"x": {"a": "int"}},
+            sources={"y": "SELECT * FROM x"},
+        )
+        self.assertEqual(
+            node.source.sql(),
+            "WITH z AS (SELECT y.a AS a FROM (SELECT x.a AS a FROM x AS x) AS y /* source: y */) SELECT z.a AS a FROM z",
+        )
+        self.assertEqual(node.alias, "")
+
+        # Node containing expanded CTE expression
+        downstream = node.downstream[0]
+        self.assertEqual(
+            downstream.source.sql(),
+            "SELECT y.a AS a FROM (SELECT x.a AS a FROM x AS x) AS y /* source: y */",
+        )
+        self.assertEqual(downstream.alias, "")
+
+        downstream = downstream.downstream[0]
+        self.assertEqual(
+            downstream.source.sql(),
+            "SELECT x.a AS a FROM x AS x",
+        )
+        self.assertEqual(downstream.alias, "y")
+
+    def test_lineage_source_with_cte(self) -> None:
+        node = lineage(
+            "a",
+            "SELECT a FROM z",
+            schema={"x": {"a": "int"}},
+            sources={"z": "WITH y AS (SELECT * FROM x) SELECT a FROM y"},
+        )
+        self.assertEqual(
+            node.source.sql(),
+            "SELECT z.a AS a FROM (WITH y AS (SELECT x.a AS a FROM x AS x) SELECT y.a AS a FROM y) AS z /* source: z */",
+        )
+        self.assertEqual(node.alias, "")
+
+        downstream = node.downstream[0]
+        self.assertEqual(
+            downstream.source.sql(),
+            "WITH y AS (SELECT x.a AS a FROM x AS x) SELECT y.a AS a FROM y",
+        )
+        self.assertEqual(downstream.alias, "z")
+
+        downstream = downstream.downstream[0]
+        self.assertEqual(
+            downstream.source.sql(),
+            "SELECT x.a AS a FROM x AS x",
+        )
+        self.assertEqual(downstream.alias, "")
+
+    def test_lineage_source_with_star(self) -> None:
+        node = lineage(
+            "a",
+            "WITH y AS (SELECT * FROM x) SELECT a FROM y",
+        )
+        self.assertEqual(
+            node.source.sql(),
+            "WITH y AS (SELECT * FROM x AS x) SELECT y.a AS a FROM y",
+        )
+        self.assertEqual(node.alias, "")
+
+        downstream = node.downstream[0]
+        self.assertEqual(
+            downstream.source.sql(),
+            "SELECT * FROM x AS x",
+        )
+        self.assertEqual(downstream.alias, "")
+
+    def test_lineage_external_col(self) -> None:
+        node = lineage(
+            "a",
+            "WITH y AS (SELECT * FROM x) SELECT a FROM y JOIN z USING (uid)",
+        )
+        self.assertEqual(
+            node.source.sql(),
+            "WITH y AS (SELECT * FROM x AS x) SELECT a AS a FROM y JOIN z AS z ON y.uid = z.uid",
+        )
+        self.assertEqual(node.alias, "")
+
+        downstream = node.downstream[0]
+        self.assertEqual(
+            downstream.source.sql(),
+            "?",
+        )
+        self.assertEqual(downstream.alias, "")
+
+    def test_lineage_values(self) -> None:
+        node = lineage(
+            "a",
+            "SELECT a FROM y",
+            sources={"y": "SELECT a FROM (VALUES (1), (2)) AS t (a)"},
+        )
+        self.assertEqual(
+            node.source.sql(),
+            "SELECT y.a AS a FROM (SELECT t.a AS a FROM (VALUES (1), (2)) AS t(a)) AS y /* source: y */",
+        )
+        self.assertEqual(node.alias, "")
+
+        downstream = node.downstream[0]
+        self.assertEqual(
+            downstream.source.sql(),
+            "SELECT t.a AS a FROM (VALUES (1), (2)) AS t(a)",
+        )
+        self.assertEqual(downstream.expression.sql(), "t.a AS a")
+        self.assertEqual(downstream.alias, "y")
+
+        downstream = downstream.downstream[0]
+        self.assertEqual(
+            downstream.source.sql(),
+            "(VALUES (1), (2)) AS t(a)",
+        )
+        self.assertEqual(downstream.expression.sql(), "a")
+        self.assertEqual(downstream.alias, "")