pytest migration: search: use tmpdir fixture instead of 'current dir' The test_empty_search method needs to refer to an existing directory that is guaranteed to not contain a search index. The current implementation chose the 'current' directory '.' but it is more of a hack than careful planning. A temporary empty directory would be cleaner but was more involved to create. With the introduction of pytest-style test classes, this can very easily be improved. Creating a temporary directory with pytest is as simple as accepting the magic 'tmpdir' argument to the test method. This 'tmpdir' is a fixture provided by pytest. The variable is initialized with a py.path.local object referring a temporary directory. For details, see: http://pytest.org/latest/tmpdir.html