ci: adding simple workflow

__tests__/add-pr-comment.test.ts

@@ -1,18 +1,33 @@
+import * as fs from 'fs'
+import * as path from 'path'
 import * as core from '@actions/core'
 import * as github from '@actions/github'
 import {WebhookPayload} from '@actions/github/lib/interfaces'
+import nock from 'nock'
 import run from '../add-pr-comment'
 
+const repoFullName = 'foo/bar'
+const repoToken = '12345'
+const simpleMessage = 'hello world'
+const multilineMessage = fs.readFileSync(path.resolve(__dirname, './message-windows.txt')).toString()
+const multilineMessageWindows = fs.readFileSync(path.resolve(__dirname, './message-windows.txt')).toString()
+
+const inputs = {
+  message: '',
+  'repo-token': '',
+  'allow-repeats': 'false',
+}
+
 beforeEach(() => {
   jest.resetModules()
   jest.spyOn(core, 'getInput').mockImplementation((name: string): string => {
     switch (name) {
       case 'message':
-        return 'hello world'
+        return inputs.message
       case 'repo-token':
-        return '12345'
+        return inputs['repo-token']
       case 'allow-repeats':
-        return 'false'
+        return inputs['allow-repeats']
       default:
         return ''
     }
@@ -20,22 +35,107 @@ beforeEach(() => {
 
   // https://developer.github.com/webhooks/event-payloads/#issues
   github.context.payload = {
-    action: 'created',
-    issue: {
+    pull_request: {
       number: 1,
     },
-    comment: {
-      id: 1,
-      user: {
-        login: 'monalisa',
+    repository: {
+      full_name: repoFullName,
+      name: 'bar',
+      owner: {
+        login: 'bar',
       },
-      body: 'Honk',
     },
+    sha: 'abc123',
   } as WebhookPayload
 })
 
+afterEach(() => {
+  jest.restoreAllMocks()
+  expect(nock.pendingMocks()).toEqual([])
+  nock.isDone()
+  nock.cleanAll()
+})
+
 describe('add-pr-comment action', () => {
-  it('runs', async () => {
+  it('creates a comment', async () => {
+    inputs.message = simpleMessage
+    inputs['repo-token'] = repoToken
+    inputs['allow-repeats'] = 'true'
+
+    const originalSetOutput = core.setOutput
+
+    jest.spyOn(core, 'setOutput').mockImplementation((key: string, value: string): void => {
+      if (key === 'comment-created') {
+        expect(value).toBe('true')
+      }
+
+      return originalSetOutput(key, value)
+    })
+
+    nock('https://api.github.com')
+      .post(`/repos/${repoFullName}/issues/1/comments`, ({body}) => body === simpleMessage)
+      .reply(200, {
+        url: 'https://github.com/#example',
+      })
+
     await expect(run()).resolves.not.toThrow()
   })
+
+  it('identifies repeat messages and does not create a comment', async () => {
+    inputs.message = simpleMessage
+    inputs['repo-token'] = repoToken
+    inputs['allow-repeats'] = 'false'
+
+    const originalSetOutput = core.setOutput
+
+    jest.spyOn(core, 'setOutput').mockImplementation((key: string, value: string): void => {
+      if (key === 'comment-created') {
+        expect(value).toBe('false')
+      }
+
+      return originalSetOutput(key, value)
+    })
+
+    nock('https://api.github.com')
+      .get(`/repos/${repoFullName}/issues/1/comments`)
+      .reply(200, [
+        {
+          body: simpleMessage,
+          user: {
+            login: 'github-actions[bot]',
+          },
+        },
+      ])
+
+    await run()
+  })
+
+  it('matches multiline messages with windows line feeds against api responses with unix linefeeds', async () => {
+    inputs.message = multilineMessageWindows
+    inputs['repo-token'] = repoToken
+    inputs['allow-repeats'] = 'false'
+
+    const originalSetOutput = core.setOutput
+
+    jest.spyOn(core, 'setOutput').mockImplementation((key: string, value: string): void => {
+      if (key === 'comment-created') {
+        expect(value).toBe('false')
+      }
+
+      return originalSetOutput(key, value)
+    })
+
+    nock('https://api.github.com')
+      .get(`/repos/${repoFullName}/issues/1/comments`)
+      .reply(200, [
+        {
+          body: multilineMessage,
+          user: {
+            login: 'github-actions[bot]',
+          },
+        },
+      ])
+
+    await run()
+  })
 })

__tests__/message-windows.txt

@@ -0,0 +1,7 @@
+## [Preview link](https://antares-blog-staging-pr-${{ github.event.number }}.azurewebsites.net)
+
+- Your changes have been deployed to the preview site. The preview site will update as you add more commits to this branch.
+- The preview site shows any future-dated articles. Don't worry, if you are publishing a future-dated article, it will not show on the production site until the file's specified date.
+- The preview link is shareable, but will be deleted when the pull request is merged or closed.
+
+> *This is an automated message.*

__tests__/message.txt

@@ -0,0 +1,7 @@
+## [Preview link](https://antares-blog-staging-pr-${{ github.event.number }}.azurewebsites.net)
+
+- Your changes have been deployed to the preview site. The preview site will update as you add more commits to this branch.
+- The preview site shows any future-dated articles. Don't worry, if you are publishing a future-dated article, it will not show on the production site until the file's specified date.
+- The preview link is shareable, but will be deleted when the pull request is merged or closed.
+
+> *This is an automated message.*