should be it

external/duckdb/tools/shell/tests/test_shell_rendering.py

@@ -0,0 +1,51 @@
+# fmt: off
+
+import pytest
+import subprocess
+import sys
+from typing import List
+from conftest import ShellTest
+import os
+from pathlib import Path
+
+
+def test_left_align(shell):
+    test = (
+        ShellTest(shell)
+        .statement(".mode box")
+        .statement(".width 5")
+        .statement(f'select 100 AS r')
+    )
+
+    result = test.run()
+    result.check_stdout("│ 100   │")
+
+def test_right_align(shell):
+    test = (
+        ShellTest(shell)
+        .statement(".mode box")
+        .statement(".width -5")
+        .statement(f'select 100 AS r')
+    )
+
+    result = test.run()
+    result.check_stdout("│   100 │")
+
+def test_markdown(shell):
+    test = (
+        ShellTest(shell)
+        .statement(".mode markdown")
+        .statement("select 42 a, 'hello' str")
+    )
+
+    result = test.run()
+    result.check_stdout("| a  |  str  |")
+
+def test_mode_insert_table(shell):
+    test = (
+        ShellTest(shell)
+        .statement(".mode box mytable")
+    )
+
+    result = test.run()
+    result.check_stderr("TABLE argument can only be used with .mode insert")