first commit

tests/unit/bank-transfer.service.test.js

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+const mockCharge = jest.fn();
+jest.mock('../../app/core/midtrans.service', () => ({
+    getCoreApi: jest.fn().mockReturnValue({
+        charge: mockCharge,
+        transaction: { status: jest.fn(), refund: jest.fn(), cancel: jest.fn() }
+    }),
+    getSnap: jest.fn().mockReturnValue({ createTransaction: jest.fn() })
+}));
+
+const mockOrderFindByPk = jest.fn();
+jest.mock('../../models/migration', () => ({
+    Order: { findByPk: mockOrderFindByPk, findOne: jest.fn(), update: jest.fn() },
+    Payment: { findOne: jest.fn(), create: jest.fn(), update: jest.fn() }
+}));
+
+const bankTransferService = require('../../app/modules/bank-transfer/services/bank-transfer.service');
+const db = require('../../models/migration');
+
+describe('BankTransferService', () => {
+    beforeEach(() => {
+        jest.clearAllMocks();
+        process.env.MIDTRANS_EXPIRY_DURATION = '1';
+        process.env.MIDTRANS_EXPIRY_UNIT = 'hour';
+    });
+
+    it('should create a bank transfer transaction (BCA) successfully', async () => {
+        const payload = { order_id: 'u-123', external_id: 'INV-001', amount: 10000 };
+        mockCharge.mockResolvedValue({ status_code: '201' });
+        const result = await bankTransferService.createTransaction(payload, 'bca');
+        expect(mockCharge).toHaveBeenCalledWith(expect.objectContaining({ payment_type: 'bank_transfer' }));
+        expect(result.status_code).toBe('201');
+    });
+
+    it('should create a mandiri transaction (echannel) successfully', async () => {
+        const payload = { order_id: 'u-123', external_id: 'INV-001', amount: 10000 };
+        mockCharge.mockResolvedValue({ status_code: '201' });
+        await bankTransferService.createTransaction(payload, 'mandiri');
+        expect(mockCharge).toHaveBeenCalledWith(expect.objectContaining({ payment_type: 'echannel' }));
+    });
+
+    it('should fallback to order total', async () => {
+        const payload = { order_id: 'u-123', external_id: 'INV-001' };
+        mockOrderFindByPk.mockResolvedValue({ total: 50000 });
+        mockCharge.mockResolvedValue({ status_code: '201' });
+        await bankTransferService.createTransaction(payload, 'bca');
+        expect(mockCharge).toHaveBeenCalledWith(expect.objectContaining({
+            transaction_details: expect.objectContaining({ gross_amount: 50000 })
+        }));
+    });
+
+    it('should throw error if order not found and amount missing', async () => {
+        mockOrderFindByPk.mockResolvedValue(null);
+        await expect(bankTransferService.createTransaction({ order_id: 'wrong' }, 'bca'))
+            .rejects.toThrow('Amount wajib diisi');
+    });
+});