Removed one more utils reference in the README and fixed directory name

Signed-off-by: Carlo Costino <carlo.costino@gsa.gov>

tests/notifications_utils/test_timezones.py

@@ -0,0 +1,36 @@
+import dateutil
+import pytest
+
+from notifications_utils.timezones import utc_string_to_aware_gmt_datetime
+
+
+@pytest.mark.parametrize(
+    "input_value,expectation",
+    [
+        ("foo", pytest.raises(dateutil.parser._parser.ParserError)),
+        (100, pytest.raises(TypeError)),
+        (True, pytest.raises(TypeError)),
+        (False, pytest.raises(TypeError)),
+        (None, pytest.raises(TypeError)),
+    ],
+)
+def test_utc_string_to_aware_gmt_datetime_rejects_bad_input(input_value, expectation):
+    with expectation:
+        utc_string_to_aware_gmt_datetime(input_value)
+
+
+@pytest.mark.parametrize(
+    "naive_time, expected_aware_hour",
+    [
+        ("2000-12-1 20:01", "15:01"),
+        ("2000-06-1 20:01", "16:01"),
+    ],
+)
+def test_utc_string_to_aware_gmt_datetime_handles_summer_and_winter(
+    naive_time,
+    expected_aware_hour,
+):
+    assert (
+        utc_string_to_aware_gmt_datetime(naive_time).strftime("%H:%M")
+        == expected_aware_hour
+    )