some utils and tests

tests/tests_unit/test_utils.py

@@ -0,0 +1,49 @@
+import datetime
+
+import pytest
+from money.currency import Currency
+
+from xexe.utils import DateRange, generate_currency_and_dates_combinations
+
+
+def test_date_range_breaks_with_reversed_dates():
+
+    with pytest.raises(ValueError):
+        DateRange(
+            start_date=datetime.date(year=2024, month=1, day=3),
+            end_date=datetime.date(year=2024, month=1, day=1),
+        )
+
+
+def test_date_range_generates_proper_dates_when_itered():
+
+    a_range = DateRange(
+        start_date=datetime.date(year=2024, month=1, day=1),
+        end_date=datetime.date(year=2024, month=1, day=3),
+    )
+
+    dates = [a_date for a_date in a_range]
+
+    assert dates[0] == datetime.date(year=2024, month=1, day=1)
+    assert dates[1] == datetime.date(year=2024, month=1, day=2)
+    assert dates[-1] == datetime.date(year=2024, month=1, day=3)
+    assert len(dates) == 3
+
+
+def generate_currency_and_dates_combinations_outputs_correctly():
+
+    date_range = DateRange(
+        start_date=datetime.date(year=2024, month=1, day=1),
+        end_date=datetime.date(year=2024, month=1, day=3),
+    )
+
+    currencies = {Currency.USD, Currency.EUR, Currency.GBP}
+
+    combinations = generate_currency_and_dates_combinations(
+        currencies=currencies, date_range=date_range
+    )
+
+    assert len(combinations) == 9
+    assert len({date for date in combinations["date"]}) == 3
+    assert len({currency for currency in combinations["from_currency"]}) == 3
+    assert len({currency for currency in combinations["to_currency"]}) == 3