diff --git a/bob/bio/base/test/test_database_implementations.py b/bob/bio/base/test/test_database_implementations.py
new file mode 100644
index 0000000000000000000000000000000000000000..de0d02ed3f39e7989d1d5f51125600f48efc6b53
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+++ b/bob/bio/base/test/test_database_implementations.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+# vim: set fileencoding=utf-8 :
+# Amir Mohammadi <amir.mohammadi@idiap.ch>
+# Wed 20 July 16:20:12 CEST 2016
+#
+
+"""
+Very simple tests for Implementations
+"""
+
+import os
+from bob.bio.base.database import BioDatabase, ZTBioDatabase
+
+
+def check_database(database, groups=('dev',), protocol=None, training_depends=False, models_depend=False):
+    assert isinstance(database, BioDatabase)
+
+    # load the directories
+    if 'HOME' in os.environ:
+        database.replace_directories(os.path.join(os.environ['HOME'], '.bob_bio_databases.txt'))
+
+    if protocol: database.protocol = protocol
+    if protocol is None: protocol = database.protocol
+
+    assert len(database.all_files()) > 0
+    assert len(database.training_files('train_extractor')) > 0
+    assert len(database.arrange_by_client(database.training_files('train_enroller'))) > 0
+
+    for group in groups:
+        model_ids = database.model_ids_with_protocol(group, protocol=protocol)
+        assert len(model_ids) > 0
+        assert database.client_id_from_model_id(model_ids[0]) is not None
+        assert len(database.enroll_files(model_ids[0], group)) > 0
+        assert len(database.probe_files(model_ids[0], group)) > 0
+
+    assert database.training_depends_on_protocol == training_depends
+    assert database.models_depend_on_protocol == models_depend
+
+
+def check_database_zt(database, groups=('dev', 'eval'), protocol=None, training_depends=False, models_depend=False):
+    check_database(database, groups, protocol, training_depends, models_depend)
+    assert isinstance(database, ZTBioDatabase)
+    for group in groups:
+        t_model_ids = database.t_model_ids(group)
+        assert len(t_model_ids) > 0
+        assert database.client_id_from_model_id(t_model_ids[0]) is not None
+        assert len(database.t_enroll_files(t_model_ids[0], group)) > 0
+        assert len(database.z_probe_files(group)) > 0
+
+