Move get_datetime into own file.

Add test cases to cover get_datetime usage and edge cases.

dakiny_bot/tests/utils/test_get_datetime.py

@@ -4,10 +4,38 @@ import datetime
 
 from freezegun import freeze_time
 
-from dakiny_bot.utils import get_datetime
+from dakiny_bot.election_utils import get_datetime
 
 
 @freeze_time("2025-6-16")
 def test_regular_get_datetime() -> None:
-    date_time = get_datetime("6/16")
-    assert date_time == datetime.datetime(2025, 6, 16)
+    """
+    Test a regular get_datetime.
+
+    Expect the returned datetime to be the frozen date.
+    Have two different days to ensure that the date is being returned correctly.
+    """
+    date_time = get_datetime("6/15")
+    assert date_time == datetime.datetime(2025, 6, 15, tzinfo=datetime.UTC)
+
+
+@freeze_time("2025-1-16")
+def test_jan_get_datetime() -> None:
+    """
+    Test previous year get_datetime.
+
+    Frozen day is in January 2025, datetime string is in December. Expect datetime to be from 2024.
+    """
+    date_time = get_datetime("12/15")
+    assert date_time == datetime.datetime(2024, 12, 15, tzinfo=datetime.UTC)
+
+
+@freeze_time("2025-12-16")
+def test_dec_get_datetime() -> None:
+    """
+    Test next year get_datetime.
+
+    Frozen day is in December 2025, datetime string is in January. Expect datetime to be from 2026.
+    """
+    date_time = get_datetime("1/15")
+    assert date_time == datetime.datetime(2026, 1, 15, tzinfo=datetime.UTC)