diff --git a/api/tests/music/test_metadata.py b/api/tests/music/test_metadata.py
index 5df2dbcf117965cf41563a6d028cbe804c3e0fd8..342bc99b8115cf0646da9c9e61c10fe645738ec3 100644
--- a/api/tests/music/test_metadata.py
+++ b/api/tests/music/test_metadata.py
@@ -1,6 +1,7 @@
 import datetime
 import os
 import pytest
+import uuid
 
 from funkwhale_api.music import metadata
 
@@ -13,9 +14,9 @@ DATA_DIR = os.path.dirname(os.path.abspath(__file__))
     ('album', 'Peer Gynt Suite no. 1, op. 46'),
     ('date', datetime.date(2012, 8, 15)),
     ('track_number', 1),
-    ('musicbrainz_albumid', 'a766da8b-8336-47aa-a3ee-371cc41ccc75'),
-    ('musicbrainz_recordingid', 'bd21ac48-46d8-4e78-925f-d9cc2a294656'),
-    ('musicbrainz_artistid', '013c8e5b-d72a-4cd3-8dee-6c64d6125823'),
+    ('musicbrainz_albumid', uuid.UUID('a766da8b-8336-47aa-a3ee-371cc41ccc75')),
+    ('musicbrainz_recordingid', uuid.UUID('bd21ac48-46d8-4e78-925f-d9cc2a294656')),
+    ('musicbrainz_artistid', uuid.UUID('013c8e5b-d72a-4cd3-8dee-6c64d6125823')),
 ])
 def test_can_get_metadata_from_ogg_file(field, value):
     path = os.path.join(DATA_DIR, 'test.ogg')
@@ -30,9 +31,9 @@ def test_can_get_metadata_from_ogg_file(field, value):
     ('album', 'You Can\'t Stop Da Funk'),
     ('date', datetime.date(2006, 2, 7)),
     ('track_number', 1),
-    ('musicbrainz_albumid', 'ce40cdb1-a562-4fd8-a269-9269f98d4124'),
-    ('musicbrainz_recordingid', 'f269d497-1cc0-4ae4-a0c4-157ec7d73fcb'),
-    ('musicbrainz_artistid', '9c6bddde-6228-4d9f-ad0d-03f6fcb19e13'),
+    ('musicbrainz_albumid', uuid.UUID('ce40cdb1-a562-4fd8-a269-9269f98d4124')),
+    ('musicbrainz_recordingid', uuid.UUID('f269d497-1cc0-4ae4-a0c4-157ec7d73fcb')),
+    ('musicbrainz_artistid', uuid.UUID('9c6bddde-6228-4d9f-ad0d-03f6fcb19e13')),
 ])
 def test_can_get_metadata_from_id3_mp3_file(field, value):
     path = os.path.join(DATA_DIR, 'test.mp3')
diff --git a/api/tests/test_import_audio_file.py b/api/tests/test_import_audio_file.py
index f291b8133fccc64ef34ba33ca6bf9516f535abb1..0fe484fa506a2324b58d0063e5b773daa0b8e6c1 100644
--- a/api/tests/test_import_audio_file.py
+++ b/api/tests/test_import_audio_file.py
@@ -2,6 +2,8 @@ import pytest
 import acoustid
 import datetime
 import os
+import uuid
+
 from django.core.management import call_command
 from django.core.management.base import CommandError
 
@@ -15,7 +17,8 @@ DATA_DIR = os.path.join(
 
 
 def test_can_create_track_from_file_metadata(db, mocker):
-    mocker.patch('acoustid.match', side_effect=acoustid.WebServiceError('test'))
+    mocker.patch(
+        'acoustid.match', side_effect=acoustid.WebServiceError('test'))
     metadata = {
         'artist': ['Test artist'],
         'album': ['Test album'],
@@ -35,33 +38,35 @@ def test_can_create_track_from_file_metadata(db, mocker):
         os.path.join(DATA_DIR, 'dummy_file.ogg'))
 
     assert track.title == metadata['title'][0]
-    assert track.mbid == metadata['musicbrainz_trackid'][0]
+    assert track.mbid == uuid.UUID(metadata['musicbrainz_trackid'][0])
     assert track.position == 4
     assert track.album.title == metadata['album'][0]
-    assert track.album.mbid == metadata['musicbrainz_albumid'][0]
+    assert track.album.mbid == uuid.UUID(metadata['musicbrainz_albumid'][0])
     assert track.album.release_date == datetime.date(2012, 8, 15)
     assert track.artist.name == metadata['artist'][0]
-    assert track.artist.mbid == metadata['musicbrainz_artistid'][0]
+    assert track.artist.mbid == uuid.UUID(metadata['musicbrainz_artistid'][0])
 
 
 def test_management_command_requires_a_valid_username(factories, mocker):
     path = os.path.join(DATA_DIR, 'dummy_file.ogg')
     user = factories['users.User'](username='me')
-    mocker.patch('funkwhale_api.providers.audiofile.management.commands.import_files.Command.do_import')  # NOQA
+    mocker.patch(
+        'funkwhale_api.providers.audiofile.management.commands.import_files.Command.do_import',  # noqa
+        return_value=(mocker.MagicMock(), []))
     with pytest.raises(CommandError):
         call_command('import_files', path, username='not_me', interactive=False)
     call_command('import_files', path, username='me', interactive=False)
 
 
 def test_import_files_creates_a_batch_and_job(factories, mocker):
-    m = mocker.patch('funkwhale_api.common.utils.on_commit')
+    m = mocker.patch('funkwhale_api.music.tasks.import_job_run')
     user = factories['users.User'](username='me')
     path = os.path.join(DATA_DIR, 'dummy_file.ogg')
     call_command(
         'import_files',
         path,
         username='me',
-        async=True,
+        async=False,
         interactive=False)
 
     batch = user.imports.latest('id')
@@ -76,26 +81,24 @@ def test_import_files_creates_a_batch_and_job(factories, mocker):
 
     assert job.source == 'file://' + path
     m.assert_called_once_with(
-        music_tasks.import_job_run.delay,
         import_job_id=job.pk,
         use_acoustid=True)
 
 
 def test_import_files_skip_acoustid(factories, mocker):
-    m = mocker.patch('funkwhale_api.common.utils.on_commit')
+    m = mocker.patch('funkwhale_api.music.tasks.import_job_run')
     user = factories['users.User'](username='me')
     path = os.path.join(DATA_DIR, 'dummy_file.ogg')
     call_command(
         'import_files',
         path,
         username='me',
-        async=True,
+        async=False,
         no_acoustid=True,
         interactive=False)
     batch = user.imports.latest('id')
     job = batch.jobs.first()
     m.assert_called_once_with(
-        music_tasks.import_job_run.delay,
         import_job_id=job.pk,
         use_acoustid=False)
 
@@ -117,20 +120,19 @@ def test_import_files_skip_if_path_already_imported(factories, mocker):
 
 
 def test_import_files_works_with_utf8_file_name(factories, mocker):
-    m = mocker.patch('funkwhale_api.common.utils.on_commit')
+    m = mocker.patch('funkwhale_api.music.tasks.import_job_run')
     user = factories['users.User'](username='me')
     path = os.path.join(DATA_DIR, 'utf8-éà◌.ogg')
     call_command(
         'import_files',
         path,
         username='me',
-        async=True,
+        async=False,
         no_acoustid=True,
         interactive=False)
     batch = user.imports.latest('id')
     job = batch.jobs.first()
     m.assert_called_once_with(
-        music_tasks.import_job_run.delay,
         import_job_id=job.pk,
         use_acoustid=False)