feat(payments): add bulk class payments creation and duplicate check

components/payments/bulkPayment.test.js

@@ -0,0 +1,33 @@
+'use strict';
+
+const { describe, it } = require('node:test');
+const assert = require('node:assert/strict');
+const paymentService = require('./paymentService');
+
+describe('Bulk Payment and Duplicate Check Service', () => {
+  it('exports createBulkClassPayments and checkDuplicatePayment', () => {
+    assert.equal(typeof paymentService.createBulkClassPayments, 'function');
+    assert.equal(typeof paymentService.checkDuplicatePayment, 'function');
+  });
+
+  it('checkDuplicatePayment returns false when userId is not provided', async () => {
+    const result = await paymentService.checkDuplicatePayment({});
+    assert.deepEqual(result, {
+      hasDuplicate: false,
+      count: 0,
+      payments: []
+    });
+  });
+
+  it('createBulkClassPayments throws error when classId is missing', async () => {
+    await assert.rejects(
+      async () => {
+        await paymentService.createBulkClassPayments({});
+      },
+      (err) => {
+        assert.equal(err.errorCode, 'VALIDATION_FAILED');
+        return true;
+      }
+    );
+  });
+});