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test: Absolute-Modifier und Stichtag-Semantik der Projektion

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Ergänzte Tests für Lückenschluss:
1. test_absolute_modifier_reduces_outflow: Absolute Modifier reduziert Ausgaben (-200 - 50 = -150)
2. test_absolute_modifier_clamps_to_zero: Absolute Modifier klemmt auf 0 (nie Vorzeichenflip: -200 + 300 = 0)
3. test_cashflow_on_start_date_excluded: Cashflows am start_date werden ausgeschlossen (Teil des Startsaldos)

Alle 18 Tests grün (15 existierend + 3 neu).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
wlfb
2026-07-17 17:27:41 +02:00
parent 020f41e9f2
commit 877cba4964
2 changed files with 32 additions and 0 deletions
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10
finance/tests/test_projection.py
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@@ -18,3 +18,13 @@ def test_no_crossing():
p = project(Decimal("100"), date(2026, 7, 31), [], horizon_days=5)
assert p.first_below_zero is None
assert p.low_point[1] == Decimal("100")
def test_cashflow_on_start_date_excluded():
"""Cashflows dated exactly on start_date are excluded (part of starting balance)"""
p = project(Decimal("100"), date(2026, 8, 1), [(date(2026, 8, 1), Decimal("-999"))],
horizon_days=5)
# All balances remain 100 because the -999 flow on start_date is ignored
assert all(bal == Decimal("100") for _, bal in p.series)
assert p.first_below_zero is None
assert p.low_point[1] == Decimal("100")

22
finance/tests/test_scenario_engine.py
View File

@@ -35,3 +35,25 @@ def test_remove_modifier_and_planned_and_loan():
assert date(2026, 8, 1) in days # Kredit-Auszahlung
assert date(2026, 9, 15) in days # Einmalposten
assert all(a != Decimal("-50") for _, a in flows) # Abo entfernt
def test_absolute_modifier_reduces_outflow():
"""Test absolute modifier for outflows: -200 - 50 = -150"""
rec = [PlainRecurring(id=1, name="Marketing", amount=Decimal("-200"),
rhythm="monthly", due_day=10, start_date=None,
end_date=None, category_id=3)]
mods = [PlainModifier(target_type="category", target_id=3,
kind="absolute", value=Decimal("50"))]
flows = build_cashflows(rec, [], [], [], mods, date(2026, 8, 1), date(2026, 8, 31))
assert flows == [(date(2026, 8, 10), Decimal("-150.00"))]
def test_absolute_modifier_clamps_to_zero():
"""Test absolute modifier clamping: -200 + 300 = 0 (never flips sign)"""
rec = [PlainRecurring(id=1, name="Marketing", amount=Decimal("-200"),
rhythm="monthly", due_day=10, start_date=None,
end_date=None, category_id=3)]
mods = [PlainModifier(target_type="category", target_id=3,
kind="absolute", value=Decimal("300"))]
flows = build_cashflows(rec, [], [], [], mods, date(2026, 8, 1), date(2026, 8, 31))
assert flows == [(date(2026, 8, 10), Decimal("0.00"))]