refactor: organize backend by business responsibility

src/modules/investments/operations/infrastructure/brokerage-operation.mapper.spec.ts

@@ -0,0 +1,64 @@
+import {
+  mapBrokerageOperation,
+  operationCategory,
+} from './brokerage-operation.mapper';
+
+describe('mapBrokerageOperation', () => {
+  it.each([
+    ['OPERATION_TYPE_COUPON', 'income'],
+    ['OPERATION_TYPE_DIVIDEND', 'income'],
+    ['OPERATION_TYPE_TAX', 'tax'],
+    ['OPERATION_TYPE_BROKER_FEE', 'fee'],
+    ['NEW_TYPE', 'other'],
+  ])('maps %s to %s', (type, category) => {
+    expect(operationCategory(type)).toBe(category);
+  });
+
+  it('keeps a trade and its commission in one exact-money entry', () => {
+    expect(
+      mapBrokerageOperation({
+        id: 'trade',
+        date: { seconds: '1' },
+        type: 'OPERATION_TYPE_BUY',
+        payment: { currency: 'rub', units: '-1', nano: '-500000000' },
+        commission: { currency: 'RUB', nano: '-5000000' },
+      }),
+    ).toMatchObject({
+      id: 'trade',
+      category: 'trade',
+      payment: { currency: 'RUB', value: '-1.5' },
+      commission: { currency: 'RUB', value: '-0.005' },
+    });
+  });
+
+  it('does not invent payment for an instrument-only movement', () => {
+    expect(
+      mapBrokerageOperation({
+        id: 'transfer',
+        date: { seconds: '1' },
+        type: 'OPERATION_TYPE_INPUT_SECURITIES',
+        quantity: '3',
+      }),
+    ).toMatchObject({
+      category: 'transfer',
+      quantity: '3',
+      payment: null,
+    });
+  });
+});
+
+describe('executed trade quantity', () => {
+  it('uses the executed part, and does not invent execution quantity when absent', () => {
+    expect(
+      mapBrokerageOperation({
+        type: 'OPERATION_TYPE_BUY',
+        quantity: '100',
+        quantityDone: '7',
+      }).quantity,
+    ).toBe('7');
+    expect(
+      mapBrokerageOperation({ type: 'OPERATION_TYPE_BUY', quantity: '100' })
+        .quantity,
+    ).toBeNull();
+  });
+});