tests: fixed test

tests/test_cli.py

@@ -205,10 +205,11 @@ def test_shell_file(args: list[str], runner: CliRunner):
     # test running the shell tool with a filename
     # make sure we don't accidentally expand the filename and include it in the shell command
     # create new file with contents
-    with open("test.txt", "w") as f:
-        f.write("yes")
-    args.append("/shell cat test.txt")
-    result = runner.invoke(gptme.cli.main, args)
+    with runner.isolated_filesystem():
+        with open("test.txt", "w") as f:
+            f.write("yes")
+        args.append("/shell cat test.txt")
+        result = runner.invoke(gptme.cli.main, args)
     output_pre, output_post = result.output.split("System", 1)
     # check for no 'yes' in parsed input (only direct command output)
     assert output_pre.count("yes") == 1, output_pre