diff --git a/beanprice/sources/csif_test.py b/beanprice/sources/csif_test.py
new file mode 100644
index 0000000..b9053f8
--- /dev/null
+++ b/beanprice/sources/csif_test.py
@@ -0,0 +1,50 @@
+import unittest
+from unittest import mock
+import datetime
+from dateutil import tz
+from dateutil.parser import parse
+
+from decimal import Decimal
+from beanprice.sources import csif
+from beanprice.source import MissingDate, SourcePrice
+
+
+def _fetch_response(contents):
+    """Return a context manager to patch a JSON response."""
+    response = mock.Mock()
+    response.status_code = 404
+    response.text = ""
+    response.json.return_value = contents
+    return mock.patch('subprocess.check_output', return_value=response)
+
+
+class CsifPriceFetcher(unittest.TestCase):
+    def test_error_invalid_ticker(self):
+        with self.assertRaises(csif.CsifApiError):
+            csif.Source().get_latest_price('INVALID')
+
+    def test_error_invalid_date(self):
+        with self.assertRaises(MissingDate):
+            csif.Source().get_historical_price('CH0030849712', parse("2050-01-01"))
+
+    def test_valid_response(self):
+        data = '' \
+               '<some gibber>' \
+               '        <td>CH0030849712</td>' \
+               '        <td>3084971</td>' \
+               '        <td>USD</td> ' \
+               '        <td>21.03.2022</td>' \
+               '        <td>3037.75000</td>' \
+               '<more gibber>'
+
+        with _fetch_response(data):
+            srcprice: SourcePrice = csif.Source().get_latest_price('CH0030849712')
+            self.assertIsInstance(srcprice, SourcePrice)
+            self.assertEqual(Decimal('3037.75000'), srcprice.price)
+            self.assertEqual('USD', srcprice.quote_currency)
+            self.assertEqual(datetime.datetime(2022, 3, 21, 0, 0, 0, tzinfo=tz.gettz('Europe/Zurich')), srcprice.time)
+            pass
+
+
+if __name__ == '__main__':
+    unittest.main()