Added test for timeout Exception

- Timeout will occur if either timeout argument is too small or gts2
is too slow to answer.
- If no timeout argument is set, the client will wait indefinitly as
before. Thus commit 16b80c1f should
not have any effect on existing code. Existing tests should cover that
assumption sufficiently.

tests/test_gts2_client.py

@@ -9,6 +9,7 @@ import os
 from os import path
 import subprocess
 import sys
+from requests.exceptions import ReadTimeout
 
 geo_ll = (12.559433, 53.036066)
 geo_ur = (12.737961, 53.238058)
@@ -362,6 +363,26 @@ class TestGts2Client(unittest.TestCase):
         except ChildProcessError:
             print("Test OK.")
 
+        try:
+            print("#### Testing timeout from client.")
+            gts2_client.client(
+                out_mode="single",
+                geo_ll=geo_ll,
+                geo_ur=geo_ur,
+                bands="B08",
+                start_date=start_date,
+                end_date=end_date,
+                version=version,
+                level=level,
+                max_cloudy=max_cloudy,
+                minimum_fill=minimum_fill,
+                stack_resolution=stack_res,
+                quiet=False,
+                sensor="S2A",
+                timeout=1)
+        except ReadTimeout:
+            print("Test OK.")
+
     def test_gts2_client_command_line(self):
         """
         Tests the command line call and the argument parsing.