Create links to users profile in chat messages

test/api/unit/libs/highlightMentions.js

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+import {
+  highlightMentions,
+} from '../../../../website/server/libs/highlightMentions';
+import mongoose from 'mongoose';
+
+describe.only('highlightMentions', () => {
+  beforeEach(() => {
+    const mockFind = {
+      select () {
+        return this;
+      },
+      lean () {
+        return this;
+      },
+      exec () {
+        return Promise.resolve([{
+          auth: { local: { username: 'user' } }, _id: '111',
+        }, { auth: { local: { username: 'user2' } }, _id: '222',
+        }, { auth: { local: { username: 'user3' } }, _id: '333',
+        },
+        ]);
+      },
+    };
+
+    sinon.stub(mongoose.Model, 'find').returns(mockFind);
+  });
+
+  afterEach(() => {
+    sinon.restore();
+  });
+
+  it('doesn\'t change text without mentions', async () => {
+    let text = 'some chat text';
+    let highlightedText = await highlightMentions(text);
+    expect(highlightedText).to.equal(text);
+  });
+  it('highlights existing users', async () => {
+    let text = '@user: message';
+    let highlightedText = await highlightMentions(text);
+    expect(highlightedText).to.equal('[@user](https://habitica.com/members/111): message');
+  });
+  it('doesn\'t highlight nonexisting users', async () => {
+    let text = '@nouser message';
+    let highlightedText = await highlightMentions(text);
+    expect(highlightedText).to.equal('@nouser message');
+  });
+  it('highlights multiple existing users', async () => {
+    let text = '@user message (@user2) @user3 @user';
+    let highlightedText = await highlightMentions(text);
+    expect(highlightedText).to.equal('[@user](https://habitica.com/members/111) message ([@user2](https://habitica.com/members/222)) [@user3](https://habitica.com/members/333) [@user](https://habitica.com/members/111)');
+  });
+  it('doesn\'t highlight more than 5 users', async () => {
+    let text = '@user @user2 @user3 @user4 @user5 @user6';
+    let highlightedText = await highlightMentions(text);
+    expect(highlightedText).to.equal(text);
+  });
+});