1 files changed, 137 insertions, 0 deletions
diff --git a/tests/parseutils/test_ctes.py b/tests/parseutils/test_ctes.py
new file mode 100644
index 0000000..3e89cca
--- /dev/null
+++ b/tests/parseutils/test_ctes.py
@@ -0,0 +1,137 @@
+import pytest
+from sqlparse import parse
+from pgcli.packages.parseutils.ctes import (
+    token_start_pos,
+    extract_ctes,
+    extract_column_names as _extract_column_names,
+)
+
+
+def extract_column_names(sql):
+    p = parse(sql)[0]
+    return _extract_column_names(p)
+
+
+def test_token_str_pos():
+    sql = "SELECT * FROM xxx"
+    p = parse(sql)[0]
+    idx = p.token_index(p.tokens[-1])
+    assert token_start_pos(p.tokens, idx) == len("SELECT * FROM ")
+
+    sql = "SELECT * FROM \nxxx"
+    p = parse(sql)[0]
+    idx = p.token_index(p.tokens[-1])
+    assert token_start_pos(p.tokens, idx) == len("SELECT * FROM \n")
+
+
+def test_single_column_name_extraction():
+    sql = "SELECT abc FROM xxx"
+    assert extract_column_names(sql) == ("abc",)
+
+
+def test_aliased_single_column_name_extraction():
+    sql = "SELECT abc def FROM xxx"
+    assert extract_column_names(sql) == ("def",)
+
+
+def test_aliased_expression_name_extraction():
+    sql = "SELECT 99 abc FROM xxx"
+    assert extract_column_names(sql) == ("abc",)
+
+
+def test_multiple_column_name_extraction():
+    sql = "SELECT abc, def FROM xxx"
+    assert extract_column_names(sql) == ("abc", "def")
+
+
+def test_missing_column_name_handled_gracefully():
+    sql = "SELECT abc, 99 FROM xxx"
+    assert extract_column_names(sql) == ("abc",)
+
+    sql = "SELECT abc, 99, def FROM xxx"
+    assert extract_column_names(sql) == ("abc", "def")
+
+
+def test_aliased_multiple_column_name_extraction():
+    sql = "SELECT abc def, ghi jkl FROM xxx"
+    assert extract_column_names(sql) == ("def", "jkl")
+
+
+def test_table_qualified_column_name_extraction():
+    sql = "SELECT abc.def, ghi.jkl FROM xxx"
+    assert extract_column_names(sql) == ("def", "jkl")
+
+
+@pytest.mark.parametrize(
+    "sql",
+    [
+        "INSERT INTO foo (x, y, z) VALUES (5, 6, 7) RETURNING x, y",
+        "DELETE FROM foo WHERE x > y RETURNING x, y",
+        "UPDATE foo SET x = 9 RETURNING x, y",
+    ],
+)
+def test_extract_column_names_from_returning_clause(sql):
+    assert extract_column_names(sql) == ("x", "y")
+
+
+def test_simple_cte_extraction():
+    sql = "WITH a AS (SELECT abc FROM xxx) SELECT * FROM a"
+    start_pos = len("WITH a AS ")
+    stop_pos = len("WITH a AS (SELECT abc FROM xxx)")
+    ctes, remainder = extract_ctes(sql)
+
+    assert tuple(ctes) == (("a", ("abc",), start_pos, stop_pos),)
+    assert remainder.strip() == "SELECT * FROM a"
+
+
+def test_cte_extraction_around_comments():
+    sql = """--blah blah blah
+            WITH a AS (SELECT abc def FROM x)
+            SELECT * FROM a"""
+    start_pos = len(
+        """--blah blah blah
+            WITH a AS """
+    )
+    stop_pos = len(
+        """--blah blah blah
+            WITH a AS (SELECT abc def FROM x)"""
+    )
+
+    ctes, remainder = extract_ctes(sql)
+    assert tuple(ctes) == (("a", ("def",), start_pos, stop_pos),)
+    assert remainder.strip() == "SELECT * FROM a"
+
+
+def test_multiple_cte_extraction():
+    sql = """WITH
+            x AS (SELECT abc, def FROM x),
+            y AS (SELECT ghi, jkl FROM y)
+            SELECT * FROM a, b"""
+
+    start1 = len(
+        """WITH
+            x AS """
+    )
+
+    stop1 = len(
+        """WITH
+            x AS (SELECT abc, def FROM x)"""
+    )
+
+    start2 = len(
+        """WITH
+            x AS (SELECT abc, def FROM x),
+            y AS """
+    )
+
+    stop2 = len(
+        """WITH
+            x AS (SELECT abc, def FROM x),
+            y AS (SELECT ghi, jkl FROM y)"""
+    )
+
+    ctes, remainder = extract_ctes(sql)
+    assert tuple(ctes) == (
+        ("x", ("abc", "def"), start1, stop1),
+        ("y", ("ghi", "jkl"), start2, stop2),
+    )