Another try to fix the appveyor on windows permission issue

Author: kotfu

tests/test_history.py

@@ -459,16 +459,18 @@ def hist_file():
         pass
 
 def test_bad_history_file_path(capsys, request):
-    with tempfile.TemporaryDirectory() as test_dir:
-        # For appveyor, create a directory in our temp dir
-        # for some reason it seems that appveyor won't let us read
-        # the directory we created
-        safe_dir = os.path.join(test_dir, 'somedir')
-        os.mkdir(safe_dir)
-        # Create a new cmd2 app
-        cmd2.Cmd(persistent_history_file=safe_dir)
-        _, err = capsys.readouterr()
-        assert 'is a directory' in err
+    # can't use tempfile.TemporaryDirectory() as a context on Appveyor
+    # on windows. it causes a file locking issue which is reflected as
+    # a permission exception
+    test_dir = tempfile.mkdtemp()
+    # Create a new cmd2 app
+    cmd2.Cmd(persistent_history_file=test_dir)
+    _, err = capsys.readouterr()
+    assert 'is a directory' in err
+    try:
+        os.rmdir(test_dir)
+    except OSError:
+        pass
 
 def test_history_file_conversion_no_truncate_on_init(hist_file, capsys):
     # test the code that converts a plain text history file to a pickle binary