Add informative error when testing user existence

tests/test_downloader.py

@@ -462,17 +462,46 @@ def test_read_excluded_submission_ids_from_file(downloader_mock: MagicMock, tmp_
 
 @pytest.mark.online
 @pytest.mark.reddit
-@pytest.mark.parametrize(('test_redditor_name', 'expected'), (
-    ('anthonyhui', True),  # Real
-    ('lhnhfkuhwreolo', False),  # Fake
-    ('Bree-Boo', False),  # Banned
+@pytest.mark.parametrize('test_redditor_name', (
+    'Paracortex',
+    'crowdstrike',
+    'HannibalGoddamnit',
 ))
-def test_check_user_existence(
+def test_check_user_existence_good(
+    test_redditor_name: str,
+    reddit_instance: praw.Reddit,
+    downloader_mock: MagicMock,
+):
+    downloader_mock.reddit_instance = reddit_instance
+    RedditDownloader._check_user_existence(downloader_mock, test_redditor_name)
+
+
+@pytest.mark.online
+@pytest.mark.reddit
+@pytest.mark.parametrize('test_redditor_name', (
+    'lhnhfkuhwreolo',
+    'adlkfmnhglojh',
+))
+def test_check_user_existence_nonexistent(
         test_redditor_name: str,
-        expected: bool,
         reddit_instance: praw.Reddit,
         downloader_mock: MagicMock,
 ):
     downloader_mock.reddit_instance = reddit_instance
-    result = RedditDownloader._check_user_existence(downloader_mock, test_redditor_name)
-    assert result == expected
+    with pytest.raises(BulkDownloaderException, match='Could not find'):
+        RedditDownloader._check_user_existence(downloader_mock, test_redditor_name)
+
+
+@pytest.mark.online
+@pytest.mark.reddit
+@pytest.mark.parametrize('test_redditor_name', (
+    'Bree-Boo',
+))
+def test_check_user_existence_banned(
+        test_redditor_name: str,
+        reddit_instance: praw.Reddit,
+        downloader_mock: MagicMock,
+):
+    downloader_mock.reddit_instance = reddit_instance
+    with pytest.raises(BulkDownloaderException, match='is banned'):
+        RedditDownloader._check_user_existence(downloader_mock, test_redditor_name)