New inbox client (#10644)

* new inbox client

* add tests for sendPrivateMessage returning the message

* update DELETE user message tests

* port v3 GET-inbox_messages

* use v4 delete message route

* sendPrivateMessage: return sent message

* fix

test/api/v3/integration/inbox/GET-inbox_messages.test.js

@@ -0,0 +1,47 @@
+import {
+  generateUser,
+} from '../../../../helpers/api-integration/v3';
+
+describe('GET /inbox/messages', () => {
+  let user;
+  let otherUser;
+
+  before(async () => {
+    [user, otherUser] = await Promise.all([generateUser(), generateUser()]);
+
+    await otherUser.post('/members/send-private-message', {
+      toUserId: user.id,
+      message: 'first',
+    });
+    await user.post('/members/send-private-message', {
+      toUserId: otherUser.id,
+      message: 'second',
+    });
+    await otherUser.post('/members/send-private-message', {
+      toUserId: user.id,
+      message: 'third',
+    });
+
+    // message to yourself
+    await user.post('/members/send-private-message', {
+      toUserId: user.id,
+      message: 'fourth',
+    });
+
+    await user.sync();
+  });
+
+  it('returns the user inbox messages as an array of ordered messages (from most to least recent)', async () => {
+    const messages = await user.get('/inbox/messages');
+
+    expect(messages.length).to.equal(4);
+
+    // message to yourself
+    expect(messages[0].text).to.equal('fourth');
+    expect(messages[0].uuid).to.equal(user._id);
+
+    expect(messages[1].text).to.equal('third');
+    expect(messages[2].text).to.equal('second');
+    expect(messages[3].text).to.equal('first');
+  });
+});