chore: initialize public repository

tests/test_calculations.py

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+from dataclasses import dataclass
+from datetime import date, timedelta
+
+import pytest
+
+from app.services.calculations import (
+    aggregate_week,
+    automatic_break_minutes,
+    compute_net_minutes,
+    cumulative_delta,
+    iso_week_bounds,
+    parse_time_to_minutes,
+    required_break_minutes_for_span,
+)
+
+
+@dataclass
+class FakeEntry:
+    date: date
+    start_minutes: int
+    end_minutes: int
+    break_minutes: int
+
+
+def test_compute_net_minutes_and_validation() -> None:
+    assert compute_net_minutes(8 * 60, 15 * 60, 30) == 390
+
+    with pytest.raises(ValueError):
+        compute_net_minutes(8 * 60, 8 * 60, 0)
+
+    with pytest.raises(ValueError):
+        compute_net_minutes(8 * 60, 12 * 60, 300)
+
+
+def test_parse_time_to_minutes() -> None:
+    assert parse_time_to_minutes("08:30") == 510
+
+    with pytest.raises(ValueError):
+        parse_time_to_minutes("8:30")
+
+
+def test_required_break_minutes_follow_german_thresholds() -> None:
+    assert required_break_minutes_for_span(6 * 60) == 0
+    assert required_break_minutes_for_span((6 * 60) + 1) == 30
+    assert required_break_minutes_for_span(9 * 60) == 30
+    assert required_break_minutes_for_span((9 * 60) + 1) == 45
+
+
+def test_automatic_break_minutes_uses_work_span() -> None:
+    assert automatic_break_minutes(8 * 60, 14 * 60) == 0
+    assert automatic_break_minutes(8 * 60, (14 * 60) + 1) == 30
+    assert automatic_break_minutes(8 * 60, 17 * 60) == 30
+    assert automatic_break_minutes(8 * 60, (17 * 60) + 1) == 45
+
+    with pytest.raises(ValueError):
+        automatic_break_minutes(8 * 60, 8 * 60)
+
+
+def test_week_aggregation_and_delta() -> None:
+    week_start, _ = iso_week_bounds(date(2026, 2, 25))
+    entries = [
+        FakeEntry(date=week_start, start_minutes=8 * 60, end_minutes=13 * 60, break_minutes=15),
+        FakeEntry(date=week_start + timedelta(days=1), start_minutes=9 * 60, end_minutes=14 * 60, break_minutes=30),
+    ]
+
+    report = aggregate_week(entries, week_start, weekly_target_minutes=1500)
+
+    assert report["weekly_ist"] == (285 + 270)
+    assert report["weekly_soll"] == 1500
+    assert report["weekly_delta"] == -945
+
+
+def test_cumulative_delta_multiple_weeks() -> None:
+    first_week_start, _ = iso_week_bounds(date(2026, 2, 2))
+    second_week_start = first_week_start + timedelta(days=7)
+
+    entries = [
+        FakeEntry(date=first_week_start, start_minutes=8 * 60, end_minutes=13 * 60, break_minutes=0),
+        FakeEntry(date=second_week_start, start_minutes=8 * 60, end_minutes=16 * 60, break_minutes=30),
+    ]
+
+    result = cumulative_delta(entries, second_week_start, weekly_target_minutes=1500)
+
+    # Woche 1: 300 - 1500, Woche 2: 450 - 1500
+    assert result == -2250