test_open_notebook fails when running tests twice in a row

[jitseniesen]

Running the tests locally seems fine when you run them once, but when running them a second time, test_open_notebook fails with a FileExistsError:

    @flaky(max_runs=3)
    def test_open_notebook(qtbot):
        """Test that a notebook can be opened from a non-ascii directory."""
        # Move the test file to non-ascii directory
        test_notebook = osp.join(LOCATION, 'test.ipynb')
        test_notebook_non_ascii = osp.join(LOCATION, u'äöüß', 'test.ipynb')
>       os.mkdir(os.path.join(LOCATION, u'äöüß'))
E       FileExistsError: [Errno 17] File exists: '/home/jitse/misc/spyder-notebook/spyder_notebook/tests/äöüß'

spyder_notebook/tests/test_plugin.py:163: FileExistsError

The first test run creates this file, which interferes with the second test run. This does not affect the CI runs because the CI servers delete the environment after every run.