Adding find functions and tests to comment model.

tests/models/comment.js

@@ -0,0 +1,46 @@
+/* eslint-env node, mocha */
+
+require('../utils/mongoose');
+const Comment = require('../../models/comment');
+const expect = require('chai').expect;
+
+describe('Comment: models', () => {
+  var mockComments
+  beforeEach(() => {
+    return Comment.create([{
+      body: 'comment 1',
+      asset_id: '123'
+    },{
+      body: 'comment 2',
+      asset_id: '123'
+    },{
+      body: 'comment 3',
+      asset_id: '456'
+    }]).then((comments) => {
+      mockComments = comments
+    });
+  });
+
+  describe('#findById()', () => {
+    it('should find a comment by id', () => {
+      return Comment.findById(mockComments[0].id).then((result) => {
+        expect(result).to.have.property('body')
+          .and.to.equal('comment 1');
+      });
+    });
+  });
+
+  describe('#findByAssetId()', () => {
+    it('should find an array of comments by asset id', () => {
+      return Comment.findByAssetId('123').then((result) => {
+        expect(result).to.have.length(2);
+        expect(result[0]).to.have.property('body')
+          .and.to.equal('comment 1');
+        expect(result[1]).to.have.property('body')
+          .and.to.equal('comment 2');
+      });
+    });
+  });
+
+  // });
+});