Allow multilevel folder schemes (#251)

* Improve some formatting

* Allow multilevel folder names

bulkredditdownloader/tests/test_file_name_formatter.py

@@ -26,7 +26,7 @@ def submission() -> MagicMock:
     return test
 
 
-@pytest.fixture()
+@pytest.fixture(scope='session')
 def reddit_submission(reddit_instance: praw.Reddit) -> praw.models.Submission:
     return reddit_instance.submission(id='lgilgt')
 
@@ -267,9 +267,30 @@ def test_format_archive_entry_comment(
         test_comment_id: str,
         expected_name: str,
         tmp_path: Path,
-        reddit_instance: praw.Reddit):
+        reddit_instance: praw.Reddit,
+):
     test_comment = reddit_instance.comment(id=test_comment_id)
     test_formatter = FileNameFormatter(test_file_scheme, test_folder_scheme)
     test_entry = Resource(test_comment, '', '.json')
     result = test_formatter.format_path(test_entry, tmp_path)
     assert result.name == expected_name
+
+
+@pytest.mark.parametrize(('test_folder_scheme', 'expected'), (
+    ('{REDDITOR}/{SUBREDDIT}', 'person/randomreddit'),
+    ('{POSTID}/{SUBREDDIT}/{REDDITOR}', '12345/randomreddit/person'),
+))
+def test_multilevel_folder_scheme(
+        test_folder_scheme: str,
+        expected: str,
+        tmp_path: Path,
+        submission: MagicMock,
+):
+    test_formatter = FileNameFormatter('{POSTID}', test_folder_scheme)
+    test_resource = MagicMock()
+    test_resource.source_submission = submission
+    test_resource.extension = '.png'
+    result = test_formatter.format_path(test_resource, tmp_path)
+    result = result.relative_to(tmp_path)
+    assert str(result.parent) == expected
+    assert len(result.parents) == (len(expected.split('/')) + 1)