tests: Add test to check GTFI doesn't raise

tests/unit_tests.py

@@ -13,8 +13,8 @@
 )
 from nose.tools import assert_raises, eq_ as eq, assert_true, assert_is_none, assert_in
 from parameterized import parameterized
-from hypothesis import given, settings
-from hypothesis.strategies import sampled_from, none, one_of, text
+from hypothesis import given, settings, assume
+from hypothesis.strategies import sampled_from, none, one_of, text, integers
 
 
 @httpretty.activate
@@ -53,6 +53,22 @@ def test_get_timezone_for_ip_empty_val(ip, service):
     )
 
 
+@httpretty.activate
+@given(
+    one_of(IP_ADDRESSES, none()),
+    sampled_from(FAKE_SERVICES),
+    integers(min_value=400, max_value=599),
+)
+@settings(max_examples=20)
+def test_get_timezone_for_ip_doesnt_raise(ip, service, status):
+    assume(status in httpretty.http.STATUSES)
+    fake_queue = mock.Mock()
+    setup_basic_api_response(status=status)
+    assert_is_none(
+        tzupdate.get_timezone_for_ip(ip=ip, service=service, queue_obj=fake_queue)
+    )
+
+
 @mock.patch("tzupdate.os.unlink")
 @mock.patch("tzupdate.os.symlink")
 @mock.patch("tzupdate.os.path.isfile")