add tests to konviva

http-api/tests/test_konviva.py

@@ -1,3 +1,5 @@
+import pytest
+
 import konviva
 from config import KONVIVA_API_URL
 
@@ -9,3 +11,8 @@ def test_konviva_token():
 
     redirect_uri = konviva.redirect_uri(token)
     assert KONVIVA_API_URL in redirect_uri
+
+
+def test_konviva_token_error():
+    with pytest.raises(konviva.KonvivaError):
+        konviva.token('sergio@doesnotexist.com')