--- a/.hgignore	Fri Jun 17 21:21:13 2016 +0800
+++ b/.hgignore	Fri Jun 17 21:23:45 2016 +0800
@@ -2,4 +2,5 @@
 
 *.pyc
 venv/
+tests/.cache/
 database.sqlite

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dev-requirements.txt	Fri Jun 17 21:23:45 2016 +0800
@@ -0,0 +1,1 @@
+pytest==2.9.2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/run-tests.py	Fri Jun 17 21:23:45 2016 +0800
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+import pytest
+
+
+def main():
+    pytest.main(['tests'])
+
+
+if __name__ == '__main__':
+    main()

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_models.py	Fri Jun 17 21:23:45 2016 +0800
@@ -0,0 +1,17 @@
+from datetime import datetime, timedelta
+
+from candolint.models import Check
+
+
+def test_duration():
+    now = datetime.now()
+    check = Check(started=now)
+
+    check.finished = now + timedelta(seconds=10)
+    assert check.get_duration() == '10 sec'
+
+    check.finished = now + timedelta(minutes=5)
+    assert check.get_duration() == '5 min'
+
+    check.finished = now + timedelta(hours=2)
+    assert check.get_duration() == '120 min'