fix: Change update user routes to use PUT instead of POST

test/api/v3/integration/user/PUT-user_update_username.test.js

@@ -0,0 +1,87 @@
+import {
+  generateUser,
+  translate as t,
+} from '../../../../helpers/api-integration/v3';
+import { model as User } from '../../../../../website/src/models/user';
+
+describe('PUT /user/update-username', async () => {
+  let endpoint = '/user/update-username';
+  let user;
+  let newUsername = 'new-username';
+  let existingUsername = 'existing-username';
+  let password = 'password'; // from habitrpg/test/helpers/api-integration/v3/object-generators.js
+  let wrongPassword = 'wrong-password';
+
+  beforeEach(async () => {
+    user = await generateUser();
+  });
+
+  it('successfully changes username', async () => {
+    let response = await user.put(endpoint, {
+      username: newUsername,
+      password,
+    });
+    expect(response).to.eql({ username: newUsername });
+    user = await User.findOne({ _id: user._id });
+    expect(user.auth.local.username).to.eql(newUsername);
+  });
+
+  context('errors', async () => {
+    describe('new username is unavailable', async () => {
+      beforeEach(async () => {
+        user = await generateUser();
+        await user.update({'auth.local.username': existingUsername, 'auth.local.lowerCaseUsername': existingUsername });
+      });
+
+      it('prevents username update', async () => {
+        await expect(user.put(endpoint, {
+          username: existingUsername,
+          password,
+        })).to.eventually.be.rejected.and.eql({
+          code: 400,
+          error: 'BadRequest',
+          message: t('usernameTaken'),
+        });
+      });
+    });
+
+    it('password is wrong', async () => {
+      await expect(user.put(endpoint, {
+        username: newUsername,
+        password: wrongPassword,
+      })).to.eventually.be.rejected.and.eql({
+        code: 401,
+        error: 'NotAuthorized',
+        message: t('wrongPassword'),
+      });
+    });
+
+    describe('social-only user', async () => {
+      beforeEach(async () => {
+        user = await generateUser();
+        await user.update({ 'auth.local': { ok: true } });
+      });
+
+      it('prevents username update', async () => {
+        await expect(user.put(endpoint, {
+          username: newUsername,
+          password,
+        })).to.eventually.be.rejected.and.eql({
+          code: 400,
+          error: 'BadRequest',
+          message: t('userHasNoLocalRegistration'),
+        });
+      });
+    });
+
+    it('new username is not provided', async () => {
+      await expect(user.put(endpoint, {
+        password,
+      })).to.eventually.be.rejected.and.eql({
+        code: 400,
+        error: 'BadRequest',
+        message: t('invalidReqParams'),
+      });
+    });
+  });
+});