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import unittest
from sqlglot.helper import tsort
class TestHelper(unittest.TestCase):
def test_tsort(self):
self.assertEqual(tsort({"a": []}), ["a"])
self.assertEqual(tsort({"a": ["b", "b"]}), ["b", "a"])
self.assertEqual(tsort({"a": ["b"]}), ["b", "a"])
self.assertEqual(tsort({"a": ["c"], "b": [], "c": []}), ["c", "a", "b"])
self.assertEqual(
tsort(
{
"a": ["b", "c"],
"b": ["c"],
"c": [],
"d": ["a"],
}
),
["c", "b", "a", "d"],
)
with self.assertRaises(ValueError):
tsort(
{
"a": ["b", "c"],
"b": ["a"],
"c": [],
}
)
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