test: improve system test (#44)

* Use a old-of-tree tmp directory to make sure there is no incidental interaction with parent node_modules
* Minimize the test fixtures.
* Add system test for `gts init`
* Expand test for build.
* Simplify test for clean.

Author: ofrobots

test/fixtures/kitchen/package-lock.json

@@ -1,17 +1,6 @@
 {
   "name": "kitchen",
   "version": "1.0.0",
-  "description": "",
-  "main": "index.js",
-  "scripts": {
-    "build": "tsc -p .",
-    "fix": "gts fix",
-    "clean": "gts clean",
-    "lint": "gts lint"
-  },
-  "keywords": [],
-  "author": "",
-  "license": "ISC",
   "devDependencies": {
     "typescript": "^2.4.2",
     "google-ts-style": "file:../google-ts-style.tgz"

test/fixtures/kitchen/package.json

@@ -0,0 +1,79 @@
+import test from 'ava';
+import * as chalk from 'chalk';
+import * as cp from 'child_process';
+import * as fs from 'fs';
+import * as ncp from 'ncp';
+import * as path from 'path';
+import * as pify from 'pify';
+import * as rimraf from 'rimraf';
+import * as tmp from 'tmp';
+
+const pkg = require('../../package.json');
+
+const rimrafp = pify(rimraf);
+const mkdirp = pify(fs.mkdir);
+const execp = pify(cp.exec);
+const renamep = pify(fs.rename);
+const ncpp = pify(ncp.ncp);
+
+const keep = !!process.env.GTS_KEEP_TEMPDIRS;
+const stagingDir = tmp.dirSync({keep: keep, unsafeCleanup: true});
+const stagingPath = stagingDir.name;
+const execOpts = {
+  cwd: `${stagingPath}/kitchen`
+};
+
+/**
+ * Create a staging directory with temp fixtures used
+ * to test on a fresh application.
+ */
+test.before(async () => {
+  try {
+    await execp('npm pack');
+    const tarball = `${pkg.name}-${pkg.version}.tgz`;
+    await renamep(tarball, `${stagingPath}/google-ts-style.tgz`);
+    await ncpp('test/fixtures', `${stagingPath}/`);
+    await execp('npm install', execOpts);
+  } catch (e) {
+    console.error('Failed to prepare test staging sandbox.');
+    console.error(e);
+    throw e;
+  }
+});
+
+test.serial('init', async t => {
+  await execp('./node_modules/.bin/google-ts-style init -y', execOpts);
+  fs.accessSync(`${stagingPath}/kitchen/tsconfig.json`);
+  t.pass();
+});
+
+test.serial('build', async t => {
+  await execp('npm run compile', execOpts);
+  fs.accessSync(`${stagingPath}/kitchen/build/src/server.js`);
+  fs.accessSync(`${stagingPath}/kitchen/build/src/server.js.map`);
+  fs.accessSync(`${stagingPath}/kitchen/build/src/server.d.ts`);
+  t.pass();
+});
+
+/**
+ * Verify the `gts clean` command actually removes the
+ * output dir
+ */
+test.serial('clean', async t => {
+  await execp('npm run clean', execOpts);
+  t.throws(() => {
+    fs.accessSync(`${stagingPath}/kitchen/build`);
+  });
+});
+
+
+/**
+ * CLEAN UP - remove the staging directory when done.
+ */
+test.after.always('cleanup staging', async () => {
+  if (!keep) {
+    stagingDir.removeCallback();
+  } else {
+    console.log(`${chalk.blue(`${__filename} staging area: ${stagingPath}`)}`);
+  }
+});