V3 payments 6 (#7104)

* payments api: cancelSubscription

* some more tests for amazon payments

* promisifying amazon payments

* somehow payment stub is not working

* cleaning up tests

* renaming tests in api/v3/integration/payments

* improvements

* cleanup, lint

* fixes as per comments

* moment.zone() is back in.

test/api/v3/unit/libs/payments.test.js

@@ -0,0 +1,75 @@
+import * as sender from '../../../../../website/src/libs/api-v3/email';
+import * as api from '../../../../../website/src/libs/api-v3/payments';
+import { model as User } from '../../../../../website/src/models/user';
+import moment from 'moment';
+
+describe('payments/index', () => {
+  let fakeSend;
+  let data;
+  let user;
+
+  describe('#createSubscription', () => {
+    beforeEach(async () => {
+      user = new User();
+    });
+
+    it('succeeds', async () => {
+      data = { user, sub: { key: 'basic_3mo' } };
+      expect(user.purchased.plan.planId).to.not.exist;
+      await api.createSubscription(data);
+      expect(user.purchased.plan.planId).to.exist;
+    });
+  });
+
+  describe('#cancelSubscription', () => {
+    beforeEach(() => {
+      fakeSend = sinon.spy(sender, 'sendTxn');
+      data = { user: new User() };
+    });
+
+    afterEach(() => {
+      fakeSend.restore();
+    });
+
+    it('plan.extraMonths is defined', () => {
+      api.cancelSubscription(data);
+      let terminated = data.user.purchased.plan.dateTerminated;
+      data.user.purchased.plan.extraMonths = 2;
+      api.cancelSubscription(data);
+      let difference = Math.abs(moment(terminated).diff(data.user.purchased.plan.dateTerminated, 'days'));
+      expect(difference - 60).to.be.lessThan(3); // the difference is approximately two months, +/- 2 days
+    });
+
+    it('plan.extraMonth is a fraction', () => {
+      api.cancelSubscription(data);
+      let terminated = data.user.purchased.plan.dateTerminated;
+      data.user.purchased.plan.extraMonths = 0.3;
+      api.cancelSubscription(data);
+      let difference = Math.abs(moment(terminated).diff(data.user.purchased.plan.dateTerminated, 'days'));
+      expect(difference - 10).to.be.lessThan(3); // the difference should be 10 days.
+    });
+
+    it('nextBill is defined', () => {
+      api.cancelSubscription(data);
+      let terminated = data.user.purchased.plan.dateTerminated;
+      data.nextBill = moment().add({ days: 25 });
+      api.cancelSubscription(data);
+      let difference = Math.abs(moment(terminated).diff(data.user.purchased.plan.dateTerminated, 'days'));
+      expect(difference - 5).to.be.lessThan(2); // the difference should be 5 days, +/- 1 day
+    });
+
+    it('saves the canceled subscription for the user', () => {
+      expect(data.user.purchased.plan.dateTerminated).to.not.exist;
+      api.cancelSubscription(data);
+      expect(data.user.purchased.plan.dateTerminated).to.exist;
+    });
+
+    it('sends a text', async () => {
+      await api.cancelSubscription(data);
+      sinon.assert.calledOnce(fakeSend);
+    });
+  });
+
+  describe('#buyGems', async () => {
+  });
+});