Add test for tab and newline characters in S3FS cursor result data

Test that the S3FS cursor correctly handles data containing tab and
newline characters, which are special characters in CSV/TSV parsing.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: laughingman7743

tests/pyathena/s3fs/test_cursor.py

@@ -275,3 +275,39 @@ def callback(query_id):
         ):
             cursor.execute("SELECT * FROM one_row", on_start_query_execution=callback)
             assert callback_query_id == cursor.query_id
+
+    def test_contain_tab_character(self, s3fs_cursor):
+        """Test that tab characters in result data are handled correctly.
+
+        S3FS cursor uses tab as delimiter for parsing Athena's CSV output.
+        This test verifies that data containing tab characters is correctly
+        parsed when Athena properly quotes such fields.
+        """
+        # Test with tab character in string using CHR(9)
+        s3fs_cursor.execute("SELECT 'before' || CHR(9) || 'after' AS col_with_tab")
+        result = s3fs_cursor.fetchone()
+        assert result == ("before\tafter",)
+
+        # Test with multiple columns where one contains tab
+        s3fs_cursor.execute(
+            """
+            SELECT
+                'normal' AS col1,
+                'has' || CHR(9) || 'tab' AS col2,
+                'also_normal' AS col3
+            """
+        )
+        result = s3fs_cursor.fetchone()
+        assert result == ("normal", "has\ttab", "also_normal")
+
+        # Test with newline character as well
+        s3fs_cursor.execute("SELECT 'line1' || CHR(10) || 'line2' AS col_with_newline")
+        result = s3fs_cursor.fetchone()
+        assert result == ("line1\nline2",)
+
+        # Test with both tab and newline
+        s3fs_cursor.execute(
+            "SELECT 'a' || CHR(9) || 'b' || CHR(10) || 'c' AS col_with_special_chars"
+        )
+        result = s3fs_cursor.fetchone()
+        assert result == ("a\tb\nc",)