add test for formatting of comments

Signed-off-by: Jakub Sokołowski <jakub@status.im>

test/comments.js

@@ -7,22 +7,59 @@ import Comments from '../src/comments'
 
 let comments, client, builds
 
+const BUILDS = [
+  {
+    id: 'ID-1',
+    commit: 'COMMIT-1',
+    success: true,
+    platform: 'PLATFORM-1',
+    duration: 'DURATION-1',
+    url: 'URL-1',
+    pkg_url: 'PKG_URL-1',
+  },
+  {
+    id: 'ID-2',
+    commit: 'COMMIT-2',
+    success: false,
+    platform: 'PLATFORM-2',
+    duration: 'DURATION-2',
+    url: 'URL-2',
+    pkg_url: 'PKG_URL-2',
+  },
+]
+
+/* expected comment based on given builds */
+const COMMENT = `
+### Jenkins Builds
+| :grey_question: | Commit | :hash: | Finished | Duration | Platform | Result |
+|-|-|-|-|-|-|-|
+| :heavy_check_mark: | COMMIT-1 | [ID-1](URL-1) | Invalid Date | DURATION-1 | \`PLATFORM-1\` | [:package: package](PKG_URL-1) |
+| | | | | | | |
+| :x: | COMMIT-2 | [ID-2](URL-2) | Invalid Date | DURATION-2 | \`PLATFORM-2\` | [:page_facing_up: build log](PKG_URL-2consoleText) |
+`
+
 describe('Comments', () => {
-  before(() => {
+  beforeEach(() => {
     //client = sinon.createStubInstance(Octokit, {what: 2})
     builds = sinon.createStubInstance(Builds, {
-      getBuilds: []
+      getBuilds: BUILDS,
     })
     comments = new Comments(client, 'owner', 'repo', builds)
   })
   
   describe('renderComment', () => {
     it('should fail with no builds', async () => {
+      builds.getBuilds.returns([])
       try {
         await comments.renderComment('PR')
       } catch(err) {
         expect(err.message).to.eq('No builds exist for this PR')
       }
     })
+
+    it('should render correctly', async () => {
+      let body = await comments.renderComment('PR')
+      expect(body).to.eq(COMMENT)
+    })
   })
 })