tests: unittest QETransactionListModel date format

adds unittests for the date formatting and categorization in
QETransactionListModel

tests/test_qml_qetransactionlistmodel.py

@@ -0,0 +1,71 @@
+from datetime import datetime
+from unittest.mock import patch
+
+from electrum.gui.qml.qetransactionlistmodel import QETransactionListModel
+
+from . import ElectrumTestCase
+
+
+class TestQETransactionListModel(ElectrumTestCase):
+
+    def test_get_section_by_timestamp(self):
+        f = QETransactionListModel.get_section_by_timestamp
+
+        mock_today = datetime(2023, 6, 15, 0, 0, 0, 0)
+        with patch('electrum.gui.qml.qetransactionlistmodel.datetime') as mock_dt:
+            mock_dt.today.return_value = mock_today
+            mock_dt.fromtimestamp = datetime.fromtimestamp
+
+            today_ts = datetime(2023, 6, 15, 10, 30, 0).timestamp()
+            self.assertEqual(f(today_ts), 'today')
+
+            today_edge_ts = datetime(2023, 6, 15, 0, 0, 1).timestamp()
+            self.assertEqual(f(today_edge_ts), 'today')
+
+            yesterday_ts = datetime(2023, 6, 14, 15, 0, 0).timestamp()
+            self.assertEqual(f(yesterday_ts), 'yesterday')
+
+            yesterday_edge_ts = datetime(2023, 6, 13, 23, 59, 59).timestamp()
+            self.assertEqual(f(yesterday_edge_ts), 'lastweek')
+
+            lastweek_ts = datetime(2023, 6, 12, 12, 0, 0).timestamp()
+            self.assertEqual(f(lastweek_ts), 'lastweek')
+
+            lastweek_boundary_ts = datetime(2023, 6, 8, 12, 0, 0).timestamp()
+            self.assertEqual(f(lastweek_boundary_ts), 'lastweek')
+
+            lastmonth_ts = datetime(2023, 6, 5, 9, 0, 0).timestamp()
+            self.assertEqual(f(lastmonth_ts), 'lastmonth')
+
+            lastmonth_boundary_ts = datetime(2023, 5, 15, 8, 0, 0).timestamp()
+            self.assertEqual(f(lastmonth_boundary_ts), 'lastmonth')
+
+            older_ts = datetime(2023, 5, 14, 10, 0, 0).timestamp()
+            self.assertEqual(f(older_ts), 'older')
+
+            much_older_ts = datetime(2022, 1, 1, 0, 0, 0).timestamp()
+            self.assertEqual(f(much_older_ts), 'older')
+
+    def test_format_date_by_section(self):
+        f = QETransactionListModel.format_date_by_section
+
+        test_date = datetime(2023, 6, 15, 14, 30, 45)
+
+        result = f('today', test_date)
+        self.assertEqual(result, '14:30')
+
+        result = f('yesterday', test_date)
+        self.assertEqual(result, '14:30')
+
+        result = f('lastweek', test_date)
+        self.assertEqual(result, 'Thu, 14:30')
+
+        result = f('lastmonth', test_date)
+        self.assertEqual(result, 'Thu 15, 14:30')
+
+        result = f('older', test_date)
+        self.assertEqual(result, '2023-06-15 14:30')
+
+        result = f('unknown_section', test_date)
+        self.assertEqual(result, '2023-06-15 14:30')
+