first commit

myteamwallet_frontend_modern/src/app/models/transaction-amount.spec.ts

@@ -0,0 +1,13 @@
+import { signedTransactionAmount } from './transaction-amount';
+
+describe('signedTransactionAmount', () => {
+  it('shows debit transaction types as negative amounts', () => {
+    expect(signedTransactionAmount(12, 'fine')).toBe(-12);
+    expect(signedTransactionAmount(12, { id: 14, name: 'expense' })).toBe(-12);
+  });
+
+  it('keeps credits and negative reversal amounts unchanged', () => {
+    expect(signedTransactionAmount(12, 'credit')).toBe(12);
+    expect(signedTransactionAmount(-12, { id: 1, name: 'credit' })).toBe(-12);
+  });
+});