Added the unit test for column_queue

Author: jprakash-db

databricks_sql_connector_core/tests/unit/test_column_queue.py

@@ -0,0 +1,24 @@
+import unittest
+import pytest
+import pyarrow as pa
+from databricks_sql_connector_core.sql.utils import ColumnQueue
+
+
+class TestColumnQueueSuite:
+    @pytest.fixture(scope="function")
+    def setup(self):
+        columnar_table = [[0, 3, 6, 9], [1, 4, 7, 10], [2, 5, 8, 11]]
+        column_names = [f"col_{i}" for i in range(len(columnar_table))]
+        return ColumnQueue(columnar_table, column_names)
+
+    def test_fetchmany_respects_n_rows(self, setup):
+        column_queue = setup
+        assert column_queue.next_n_rows(2) == [[0, 3], [1, 4], [2, 5]]
+        assert column_queue.next_n_rows(2) == [[6, 9], [7, 10], [8, 11]]
+
+    def test_fetch_remaining_rows_respects_n_rows(self, setup):
+        column_queue = setup
+        assert column_queue.next_n_rows(2) == [[0, 3], [1, 4], [2, 5]]
+        assert column_queue.remaining_rows() == [[6, 9], [7, 10], [8, 11]]
+
+