Initial commit

backend/tests/unit/test_holidays.py

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+"""Tests for Swedish holiday utilities."""
+
+import datetime
+
+import pytest
+
+from app.utils.holidays import (
+    get_holiday_name,
+    get_swedish_holidays,
+    is_swedish_holiday,
+)
+
+
+class TestGetSwedishHolidays:
+    """Test get_swedish_holidays function."""
+
+    def test_returns_dict(self) -> None:
+        """get_swedish_holidays returns a dictionary."""
+        result = get_swedish_holidays(2026)
+        assert isinstance(result, dict)
+        assert len(result) > 0
+
+    def test_keys_are_dates(self) -> None:
+        """All keys are datetime.date objects."""
+        result = get_swedish_holidays(2026)
+        for key in result.keys():
+            assert isinstance(key, datetime.date)
+
+    def test_values_are_strings(self) -> None:
+        """All values are strings."""
+        result = get_swedish_holidays(2026)
+        for value in result.values():
+            assert isinstance(value, str)
+            assert len(value) > 0
+
+    def test_christmas_2026(self) -> None:
+        """Christmas 2026 (Dec 25) is in the holidays."""
+        result = get_swedish_holidays(2026)
+        christmas = datetime.date(2026, 12, 25)
+        assert christmas in result
+        assert "Jul" in result[christmas]  # Holiday name contains "Jul"
+
+    def test_new_year_2026(self) -> None:
+        """New Year's Day 2026 (Jan 1) is in the holidays."""
+        result = get_swedish_holidays(2026)
+        new_year = datetime.date(2026, 1, 1)
+        assert new_year in result
+
+    def test_midsummer_2026(self) -> None:
+        """Midsummer 2026 (Midsommar) is in the holidays."""
+        result = get_swedish_holidays(2026)
+        # Midsummer is always a Saturday in mid-June
+        midsummer_2026 = datetime.date(2026, 6, 20)
+        assert midsummer_2026 in result
+        assert "Midsommar" in result[midsummer_2026]
+
+    def test_easter_2026(self) -> None:
+        """Easter-related days (Långfredagen, Påskdagen) in 2026."""
+        result = get_swedish_holidays(2026)
+        # Easter 2026 is April 5; Good Friday would be April 3
+        good_friday = datetime.date(2026, 4, 3)
+        easter_sunday = datetime.date(2026, 4, 5)
+        assert good_friday in result
+        assert easter_sunday in result
+
+    def test_different_years(self) -> None:
+        """Different years have different holiday sets."""
+        holidays_2025 = get_swedish_holidays(2025)
+        holidays_2026 = get_swedish_holidays(2026)
+        holidays_2027 = get_swedish_holidays(2027)
+
+        # All should have holidays
+        assert len(holidays_2025) > 0
+        assert len(holidays_2026) > 0
+        assert len(holidays_2027) > 0
+
+    def test_caching(self) -> None:
+        """Calling get_swedish_holidays twice returns same object (cached)."""
+        result1 = get_swedish_holidays(2026)
+        result2 = get_swedish_holidays(2026)
+        # Should be the same object due to caching
+        assert result1 is result2
+
+    def test_random_day_not_holiday(self) -> None:
+        """Random weekday is not a holiday."""
+        result = get_swedish_holidays(2026)
+        random_day = datetime.date(2026, 6, 8)  # Random Monday
+        assert random_day not in result
+
+
+class TestIsSwedishHoliday:
+    """Test is_swedish_holiday function."""
+
+    def test_christmas_is_holiday(self) -> None:
+        """Christmas is recognized as a holiday."""
+        assert is_swedish_holiday(datetime.date(2026, 12, 25))
+
+    def test_new_year_is_holiday(self) -> None:
+        """New Year's Day is recognized as a holiday."""
+        assert is_swedish_holiday(datetime.date(2026, 1, 1))
+
+    def test_random_day_not_holiday(self) -> None:
+        """Random day is not a holiday."""
+        assert not is_swedish_holiday(datetime.date(2026, 6, 8))
+
+    def test_monday_not_holiday(self) -> None:
+        """Random Monday is not a holiday."""
+        assert not is_swedish_holiday(datetime.date(2026, 6, 1))
+
+
+class TestGetHolidayName:
+    """Test get_holiday_name function."""
+
+    def test_christmas_name(self) -> None:
+        """Get name of Christmas."""
+        name = get_holiday_name(datetime.date(2026, 12, 25))
+        assert name is not None
+        assert "Jul" in name
+
+    def test_non_holiday_returns_none(self) -> None:
+        """Non-holiday date returns None."""
+        name = get_holiday_name(datetime.date(2026, 6, 8))
+        assert name is None
+
+    def test_new_year_name(self) -> None:
+        """Get name of New Year's Day."""
+        name = get_holiday_name(datetime.date(2026, 1, 1))
+        assert name is not None
+
+    def test_midsummer_name(self) -> None:
+        """Get name of Midsummer."""
+        name = get_holiday_name(datetime.date(2026, 6, 20))
+        assert name is not None
+        assert "Midsommar" in name