test(req-001): tighten AC coverage and remove markdown trailing whitespace

Co-authored-by: genichin <4282227+genichin@users.noreply.github.com>

tests/test_v1_portfolios_manual_ledger.py

@@ -6,6 +6,7 @@ import os
 import time
 from contextlib import ExitStack
 from datetime import UTC, datetime
+from decimal import Decimal
 from typing import Any
 from unittest.mock import patch
 
@@ -71,6 +72,7 @@ class _FakeRepo:
         self.principal = principal or _token_principal()
         self.entries: list[LedgerEntry] = []
         self._next_id = 1
+        self._dividend_amounts: dict[int, Decimal] = {}
 
     def close(self) -> None:
         pass
@@ -86,7 +88,9 @@ class _FakeRepo:
     def record_manual_ledger(self, portfolio_id: str, **kwargs: Any) -> LedgerEntry:
         self.get(portfolio_id)
         action = kwargs["action"]
-        amount = float(kwargs.get("amount") or 0.0)
+        amount_raw = kwargs.get("amount")
+        amount_decimal = Decimal(str(amount_raw if amount_raw is not None else 0))
+        amount = float(amount_decimal)
         quantity = float(kwargs.get("quantity") or 0.0)
         price = float(kwargs.get("price") or 0.0)
         fee = float(kwargs.get("fee") or 0.0)
@@ -141,7 +145,7 @@ class _FakeRepo:
                     if e.action == "DIVIDEND"
                     and e.ledger_entry_id not in reversed_ids
                     and e.executed_at == executed_at
-                    and abs(float(e.price) - amount) < 1e-9
+                    and self._dividend_amounts.get(e.ledger_entry_id, Decimal(str(e.price))) == amount_decimal
                     and e.note == note
                 ),
                 None,
@@ -211,6 +215,8 @@ class _FakeRepo:
         )
         self._next_id += 1
         self.entries.append(entry)
+        if action == "DIVIDEND":
+            self._dividend_amounts[entry.ledger_entry_id] = amount_decimal
         return entry
 
     def list_manual_ledger_entries(self, portfolio_id: str, limit: int = 50) -> list[LedgerEntry]:
@@ -576,6 +582,42 @@ def test_dividend_requires_executed_at_and_rejects_fee_field() -> None:
     assert invalid_fee.status_code == 422
 
 
+def test_dividend_rejects_invalid_amount_tax_and_unrelated_fields_without_state_change() -> None:
+    repo = _FakeRepo(_portfolio(cash=1000, quantity=10, price=10, buffer=500))
+    client = _make_client(repo)
+    baseline = (
+        repo.portfolio.cash_balance,
+        repo.portfolio.asset_quantity,
+        repo.portfolio.profit_buffer,
+        len(repo.entries),
+    )
+
+    invalid_payloads = [
+        {"action": "DIVIDEND", "amount": 0, "executed_at": "2026-09-01"},
+        {"action": "DIVIDEND", "amount": -1, "executed_at": "2026-09-01"},
+        {"action": "DIVIDEND", "amount": 1, "tax": -1, "executed_at": "2026-09-01"},
+        {"action": "DIVIDEND", "amount": 1, "tax": "0.000000001", "executed_at": "2026-09-01"},
+        {"action": "DIVIDEND", "amount": 1, "tax": "1000000000000.00000000", "executed_at": "2026-09-01"},
+        {"action": "DIVIDEND", "amount": 1, "executed_at": "2026-09-01", "quantity": 1},
+        {"action": "DIVIDEND", "amount": 1, "executed_at": "2026-09-01", "price": 1},
+        {"action": "DIVIDEND", "amount": 1, "executed_at": "2026-09-01", "target_ledger_entry_id": 1},
+    ]
+
+    for payload in invalid_payloads:
+        resp = client.post(
+            f"/v1/portfolios/{_PORTFOLIO_ID}/ledger/manual",
+            json=payload,
+            headers=_auth(),
+        )
+        assert resp.status_code == 422
+        assert (
+            repo.portfolio.cash_balance,
+            repo.portfolio.asset_quantity,
+            repo.portfolio.profit_buffer,
+            len(repo.entries),
+        ) == baseline
+
+
 def test_dividend_rejects_sub_minimum_numeric_precision() -> None:
     repo = _FakeRepo(_portfolio())
     client = _make_client(repo)
@@ -653,6 +695,25 @@ def test_dividend_with_different_decimal_amount_is_not_treated_as_duplicate() ->
     assert second.status_code == 201
 
 
+def test_dividend_duplicate_check_does_not_collapse_decimals_that_can_alias_in_float() -> None:
+    repo = _FakeRepo(_portfolio())
+    client = _make_client(repo)
+
+    first = client.post(
+        f"/v1/portfolios/{_PORTFOLIO_ID}/ledger/manual",
+        json={"action": "DIVIDEND", "amount": "90000000.00000001", "executed_at": "2026-09-01", "note": "Q3"},
+        headers=_auth(),
+    )
+    assert first.status_code == 201
+
+    second = client.post(
+        f"/v1/portfolios/{_PORTFOLIO_ID}/ledger/manual",
+        json={"action": "DIVIDEND", "amount": "90000000.00000002", "executed_at": "2026-09-01", "note": "Q3"},
+        headers=_auth(),
+    )
+    assert second.status_code == 201
+
+
 def test_reversed_dividend_is_excluded_from_future_duplicate_candidate_matching() -> None:
     repo = _FakeRepo(_portfolio())
     client = _make_client(repo)