test(connect): improve show() test

tests/connect/test_show.py

@@ -1,9 +1,35 @@
 from __future__ import annotations
 
 
-def test_show(spark_session):
+def test_show(spark_session, capsys):
     df = spark_session.range(10)
-    try:
-        df.show()
-    except Exception as e:
-        assert False, e
+    df.show()
+    captured = capsys.readouterr()
+    expected = (
+        "╭───────╮\n"
+        "│ id    │\n"
+        "│ ---   │\n"
+        "│ Int64 │\n"
+        "╞═══════╡\n"
+        "│ 0     │\n"
+        "├╌╌╌╌╌╌╌┤\n"
+        "│ 1     │\n"
+        "├╌╌╌╌╌╌╌┤\n"
+        "│ 2     │\n"
+        "├╌╌╌╌╌╌╌┤\n"
+        "│ 3     │\n"
+        "├╌╌╌╌╌╌╌┤\n"
+        "│ 4     │\n"
+        "├╌╌╌╌╌╌╌┤\n"
+        "│ 5     │\n"
+        "├╌╌╌╌╌╌╌┤\n"
+        "│ 6     │\n"
+        "├╌╌╌╌╌╌╌┤\n"
+        "│ 7     │\n"
+        "├╌╌╌╌╌╌╌┤\n"
+        "│ 8     │\n"
+        "├╌╌╌╌╌╌╌┤\n"
+        "│ 9     │\n"
+        "╰───────╯\n"
+    )
+    assert captured.out == expected