add script to test prs (codesandbox#2790)

* add script to test prs

* do not throw on stderror, it breaks initial checkout

* do not install deps, as they rarely change

* better logs

* merge master before creating PR branch

Author: christianalfoni

package.json

@@ -56,6 +56,7 @@
     "start:test": "lerna run start:test --scope app --stream",
     "start:vscode": "cross-env VSCODE=1 yarn start:fast & cd standalone-packages/monaco-editor && yarn simpleserver & cd standalone-packages/vscode && yarn watch",
     "test": "lerna run test --ignore codesandbox-browserfs",
+    "test:pr": "node testpr-script",
     "test:ci": "lerna run test --ignore codesandbox-browserfs -- --ci --testResultsProcessor=\"jest-junit\" ",
     "test:integrations": "lerna exec --scope app --stream -- yarn test:integrations",
     "test:jest-lite": "lerna exec --scope app --stream -- yarn run test jest-lite --watch --coverage",
@@ -86,7 +87,8 @@
     "lint-staged": "^9.2.5",
     "prettier": "1.17.0",
     "pretty-quick": "^1.10.0",
-    "typescript": "3.6.3"
+    "typescript": "3.6.3",
+    "username": "^5.1.0"
   },
   "husky": {
     "hooks": {

testpr-script.js

@@ -0,0 +1,57 @@
+const { spawn } = require('child_process');
+const { argv } = require('yargs');
+const username = require('username');
+
+const id = argv._[0];
+
+function spawnPromise(command, args) {
+  return new Promise((resolve, reject) => {
+    const p = spawn(command, args);
+
+    p.stdout.on('data', data => {
+      // eslint-disable-next-line
+      console.log(data.toString());
+    });
+
+    p.stderr.on('data', data => {
+      console.error(data.toString());
+    });
+
+    p.on('exit', code => {
+      if (code === 0) {
+        resolve();
+      } else {
+        reject();
+      }
+    });
+  });
+}
+
+async function test(prId) {
+  const branchName = `pr-${username.sync()}-${prId}`;
+
+  Promise.resolve()
+    .then(() => spawnPromise('git', ['checkout', 'master']))
+    .then(() => spawnPromise('git', ['pull']))
+    .then(() =>
+      spawnPromise('git', [
+        'fetch',
+        'origin',
+        `pull/${prId}/head:${branchName}`,
+      ])
+    )
+    .then(() => spawnPromise('git', ['checkout', branchName]))
+    .then(() => spawnPromise('git', ['merge', 'master']))
+    .then(() => spawnPromise('yarn', ['build:deps']))
+    .catch(() => {
+      console.error(
+        'Something wrong happened building the deps, maybe missing a new package added. Please install and run build:deps manually before continuing'
+      );
+    });
+}
+
+if (id && Number(id)) {
+  test(Number(id));
+} else {
+  throw new Error('You have to pass the ID of a PR, ex: yarn test:pr 1234');
+}

yarn.lock

@@ -17042,7 +17042,7 @@ mem@^1.1.0:
   dependencies:
     mimic-fn "^1.0.0"
 
-mem@^4.0.0:
+mem@^4.0.0, mem@^4.3.0:
   version "4.3.0"
   resolved "https://registry.yarnpkg.com/mem/-/mem-4.3.0.tgz#461af497bc4ae09608cdb2e60eefb69bff744178"
   integrity sha512-qX2bG48pTqYRVmDB37rn/6PT7LcR8T7oAX3bf99u1Tt1nzxYfxkgqDwUwolPlXweM0XzBOBFzSx4kfp7KP1s/w==
@@ -25865,6 +25865,14 @@ user-home@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/user-home/-/user-home-1.1.1.tgz#2b5be23a32b63a7c9deb8d0f28d485724a3df190"
 
+username@^5.1.0:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/username/-/username-5.1.0.tgz#a7f9325adce2d0166448cdd55d4985b1360f2508"
+  integrity sha512-PCKbdWw85JsYMvmCv5GH3kXmM66rCd9m1hBEDutPNv94b/pqCMT4NtcKyeWYvLFiE8b+ha1Jdl8XAaUdPn5QTg==
+  dependencies:
+    execa "^1.0.0"
+    mem "^4.3.0"
+
 utif@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/utif/-/utif-2.0.1.tgz#9e1582d9bbd20011a6588548ed3266298e711759"