Show credit settlements as positive amounts

tests/test_contributions.py

@@ -3,8 +3,10 @@ from decimal import Decimal
 import pytest
 
 from ccma.domain.contributions import (
+    allocated_total,
     claim_balance,
     claim_items,
+    claim_settled_total,
     claim_status,
     claim_total,
     payment_allocated_total,
@@ -102,6 +104,25 @@ def test_payment_can_be_split_across_multiple_claims(tmp_path) -> None:
         )
 
 
+def test_credit_claim_settlement_is_displayed_as_positive_amount() -> None:
+    claim = {"claim_id": "claim-1", "title": "Kautionsrückzahlung", "amount": "-25.00"}
+    data = ContributionData(
+        claims=[claim],
+        credits=[{"credit_id": "credit-1", "amount": "25.00"}],
+        allocations=[
+            {
+                "allocation_id": "allocation-1",
+                "claim_id": "claim-1",
+                "credit_id": "credit-1",
+                "amount": "25.00",
+            }
+        ],
+    )
+
+    assert allocated_total(data, "claim-1") == Decimal("-25.00")
+    assert claim_settled_total(data, claim) == Decimal("25.00")
+
+
 def test_reminder_fee_increases_claim_and_is_audited(tmp_path) -> None:
     repository, member = _repository_with_claim(tmp_path)