diff --git a/swh/web/tests/api/views/test_release.py b/swh/web/tests/api/views/test_release.py
--- a/swh/web/tests/api/views/test_release.py
+++ b/swh/web/tests/api/views/test_release.py
@@ -7,7 +7,9 @@
 from hypothesis import given
 
 from swh.model.hashutil import hash_to_bytes, hash_to_hex
-from swh.model.model import Person, Release, TimestampWithTimezone
+from swh.model.model import (
+    ObjectType, Person, Release, Timestamp, TimestampWithTimezone
+)
 from swh.web.common.utils import reverse
 from swh.web.tests.data import random_sha1
 from swh.web.tests.strategies import (
@@ -36,10 +38,11 @@
 @given(content(), directory(), release())
 def test_api_release_target_type_not_a_revision(api_client, archive_data,
                                                 content, directory, release):
-    for target_type, target in (('content', content), ('directory', directory),
-                                ('release', release)):
+    for target_type, target in ((ObjectType.CONTENT, content),
+                                (ObjectType.DIRECTORY, directory),
+                                (ObjectType.RELEASE, release)):
 
-        if target_type == 'content':
+        if target_type == ObjectType.CONTENT:
             target = target['sha1_git']
 
         sample_release = Release(
@@ -49,7 +52,9 @@
                 name=b'author'
             ),
             date=TimestampWithTimezone(
-                timestamp=int(datetime.now().timestamp()),
+                timestamp=Timestamp(
+                    seconds=int(datetime.now().timestamp()),
+                    microseconds=0),
                 offset=0,
                 negative_utc=False,
             ),
@@ -71,12 +76,12 @@
 
         expected_release = archive_data.release_get(new_release_id)
 
-        if target_type == 'content':
+        if target_type == ObjectType.CONTENT:
             url_args = {'q': 'sha1_git:%s' % target}
         else:
             url_args = {'sha1_git': target}
 
-        target_url = reverse('api-1-%s' % target_type,
+        target_url = reverse('api-1-%s' % target_type.value,
                              url_args=url_args,
                              request=rv.wsgi_request)
         expected_release['target_url'] = target_url
diff --git a/swh/web/tests/data.py b/swh/web/tests/data.py
--- a/swh/web/tests/data.py
+++ b/swh/web/tests/data.py
@@ -12,7 +12,7 @@
 from swh.indexer.mimetype import MimetypeIndexer
 from swh.indexer.ctags import CtagsIndexer
 from swh.indexer.storage import get_indexer_storage
-from swh.model.hashutil import hash_to_hex, DEFAULT_ALGORITHMS
+from swh.model.hashutil import hash_to_hex, hash_to_bytes, DEFAULT_ALGORITHMS
 from swh.model.model import Directory, Origin
 from swh.loader.git.from_disk import GitLoaderFromArchive
 from swh.search import get_search
@@ -188,7 +188,7 @@
         storage.origin_visit_update(
             url, visit.visit,
             status='full',
-            snapshot='1a8893e6a86f444e8be8e7bda6cb34fb1735a00e')
+            snapshot=hash_to_bytes('1a8893e6a86f444e8be8e7bda6cb34fb1735a00e'))
 
     contents = set()
     directories = set()
diff --git a/swh/web/tests/strategies.py b/swh/web/tests/strategies.py
--- a/swh/web/tests/strategies.py
+++ b/swh/web/tests/strategies.py
@@ -16,7 +16,9 @@
 
 from swh.model.hashutil import hash_to_hex, hash_to_bytes
 from swh.model.identifiers import directory_identifier
-from swh.model.model import Person, Revision, TimestampWithTimezone
+from swh.model.model import (
+    Person, Revision, RevisionType, TimestampWithTimezone
+)
 from swh.storage.algos.revisions_walker import get_revisions_walker
 from swh.model.hypothesis_strategies import (
     origins as new_origin_strategy, snapshots as new_snapshot
@@ -366,7 +368,7 @@
         committer_date=TimestampWithTimezone.from_datetime(
             draw(new_swh_date())),
         synthetic=False,
-        type='git',
+        type=RevisionType.GIT,
     )