add routes for buy ops and integration tests

test/api/v3/integration/user/POST-user_buy.test.js

@@ -0,0 +1,42 @@
+import {
+  generateUser,
+  translate as t,
+} from '../../../../helpers/api-integration/v3';
+import shared from '../../../../../common/script';
+
+let content = shared.content;
+
+describe('POST /user/buy/:key', () => {
+  let user;
+
+  beforeEach(async () => {
+    user = await generateUser({
+      'stats.gp': 400,
+    });
+  });
+
+  // More tests in common code unit tests
+
+  it('returns an error if the item is not found', async () => {
+    await expect(user.post(`/user/buy/notExisting`))
+      .to.eventually.be.rejected.and.eql({
+        code: 404,
+        error: 'NotFound',
+        message: t('itemNotFound', {key: 'notExisting'}),
+      });
+  });
+
+  it('buys an item', async () => {
+    let potion = content.potion;
+    let res = await user.post(`/user/buy/potion`);
+    await user.sync();
+
+    expect(res.data).to.eql({
+      items: JSON.parse(JSON.stringify(user.items)), // otherwise dates can't be compared
+      achievements: user.achievements,
+      stats: user.stats,
+      flags: JSON.parse(JSON.stringify(user.flags)), // otherwise dates can't be compared
+    });
+    expect(res.message).to.equal(t('messageBought', {itemText: potion.text()}));
+  });
+});