Add tests, complete readme

.github/actions/check-pr-status/README.md

@@ -2,6 +2,8 @@
 
 This action checks a PR labels, milestone and status to validate it is ready for merging into master.
 
+> ❗️ When making changes to this code, make sure to run the build before committing. See [Development](#development) to know more.
+
 ## Conditions
 
 1. The PR should not have the following labels:
@@ -12,3 +14,22 @@ This action checks a PR labels, milestone and status to validate it is ready for
 2. The PR should have one and only one `source: *` label.
 3. The PR should have one and only one `issue-type: *` label.
 4. The PR must have a milestone defined.
+
+## Contributing
+
+### Requirements
+
+- The code is compatible with Node 14+
+
+### Dependencies
+
+- Run `yarn` to install the dependencies
+
+### Development
+
+In order for the action to run on github all the code needs to be bundled and committed because github actions do not manage dependencies for us. [Github reference documentation](https://docs.github.com/en/actions/creating-actions/creating-a-javascript-action#commit-tag-and-push-your-action-to-github).
+
+### Commands
+
+- `yarn build`: Build the code the must be committed
+- `yarn watch`: Build in watch mode

.github/actions/check-pr-status/__tests__/action.test.js

@@ -0,0 +1,103 @@
+const action = require('../index');
+
+jest.mock('@actions/github');
+jest.mock('@actions/core');
+
+const github = require('@actions/github');
+const core = require('@actions/core');
+
+test.each(action.BLOCKING_LABELS)('Test blocking labels %s', async label => {
+  github.context = {
+    payload: {
+      pull_request: {
+        labels: [{ name: label }],
+      },
+    },
+  };
+
+  const setFailed = jest.spyOn(core, 'setFailed');
+
+  await action();
+
+  expect(setFailed).toHaveBeenCalled();
+  console.log(setFailed.mock.calls[0][0]);
+  expect(setFailed.mock.calls[0][0]).toContain(`The PR has been labelled with a blocking label`);
+
+  setFailed.mockRestore();
+});
+
+test('Test missing source label', async () => {
+  github.context = {
+    payload: {
+      pull_request: {
+        labels: [{ name: 'issue-type: enhancement' }],
+      },
+    },
+  };
+
+  const setFailed = jest.spyOn(core, 'setFailed');
+
+  await action();
+
+  expect(setFailed).toHaveBeenCalled();
+  expect(setFailed.mock.calls[0][0]).toBe(`The PR must have one and only one 'source:' label.`);
+
+  setFailed.mockRestore();
+});
+
+test('Test too many source label', async () => {
+  github.context = {
+    payload: {
+      pull_request: {
+        labels: [{ name: 'source: a' }, { name: 'source: b' }, { name: 'issue-type: enhancement' }],
+      },
+    },
+  };
+
+  const setFailed = jest.spyOn(core, 'setFailed');
+
+  await action();
+
+  expect(setFailed).toHaveBeenCalled();
+  expect(setFailed.mock.calls[0][0]).toBe(`The PR must have one and only one 'source:' label.`);
+
+  setFailed.mockRestore();
+});
+
+test('Test missing issue-type label', async () => {
+  github.context = {
+    payload: {
+      pull_request: {
+        labels: [{ name: 'source: core' }],
+      },
+    },
+  };
+
+  const setFailed = jest.spyOn(core, 'setFailed');
+
+  await action();
+
+  expect(setFailed).toHaveBeenCalled();
+  expect(setFailed.mock.calls[0][0]).toBe(`The PR must have one and only one 'issue-type:' label.`);
+
+  setFailed.mockRestore();
+});
+
+test('Test too many issue-type label', async () => {
+  github.context = {
+    payload: {
+      pull_request: {
+        labels: [{ name: 'issue-type: a' }, { name: 'issue-type: b' }, { name: 'source: core' }],
+      },
+    },
+  };
+
+  const setFailed = jest.spyOn(core, 'setFailed');
+
+  await action();
+
+  expect(setFailed).toHaveBeenCalled();
+  expect(setFailed.mock.calls[0][0]).toBe(`The PR must have one and only one 'issue-type:' label.`);
+
+  setFailed.mockRestore();
+});

.github/actions/check-pr-status/index.js

@@ -1,16 +1,19 @@
 const core = require('@actions/core');
-const { context } = require('@actions/github');
+const github = require('@actions/github');
 
 const BLOCKING_LABELS = [`flag: 💥 Breaking change`, `flag: don't merge`];
 
 async function main() {
   try {
-    const labels = context.payload.pull_request?.labels;
+    const labels = github.context.payload.pull_request?.labels ?? [];
 
-    const hasBlockingLabel = labels.some(label => BLOCKING_LABELS.includes(label.name));
-    if (hasBlockingLabel) {
+    const blockingLabels = labels.filter(label => BLOCKING_LABELS.includes(label.name));
+
+    if (blockingLabels.length > 0) {
       core.setFailed(
-        `The PR has been labelled with a blocking label (${BLOCKING_LABELS.join(', ')}).`
+        `The PR has been labelled with a blocking label (${blockingLabels
+          .map(label => label.name)
+          .join(', ')}).`
       );
 
       return;
@@ -41,4 +44,10 @@ async function main() {
   }
 }
 
-main();
+main.BLOCKING_LABELS = BLOCKING_LABELS;
+
+if (require.main === module) {
+  main();
+} else {
+  module.exports = main;
+}

.github/actions/check-pr-status/package.json

@@ -5,7 +5,8 @@
   "license": "MIT",
   "private": true,
   "scripts": {
-    "build": "NODE_ENV=production ncc build index.js -o dist --minify"
+    "build": "NODE_ENV=production ncc build index.js -o dist --minify",
+    "watch": "NODE_ENV=production ncc build index.js -w -o dist --minify"
   },
   "devDependencies": {
     "@actions/core": "1.6.0",

jest.config.js

@@ -4,5 +4,5 @@ const baseConfig = require('./jest.base-config');
 
 module.exports = {
   ...baseConfig,
-  projects: ['<rootDir>/packages/**/jest.config.js'],
+  projects: ['<rootDir>/.github', '<rootDir>/packages/**/jest.config.js'],
 };