refactor: Use ES6, Test with AVA

- Use async/await instead of callbacks
- Use execa to run command line
- Use AVA for tests
- Add several assertions in the unit tests
- Add documentation (comments) in the tests
- Run tests with a real git repo instead of mocking child_process and add test helpers to create repos, commits and checkout
- Simplify test directory structure
- Simplify code readability (mostly with async/await)
- Use eslint for for linting, prettier for formatting

test/helpers/git-utils.js

@@ -0,0 +1,61 @@
+import {mkdir} from 'fs-extra';
+import tempy from 'tempy';
+import execa from 'execa';
+import pMapSeries from 'p-map-series';
+
+/**
+ * Commit message informations.
+ * 
+ * @typedef {Object} Commit
+ * @property {string} branch The commit branch
+ * @property {string} hash The commit hash
+ * @property {string} message The commit message
+ */
+
+/**
+  * Create a temporary git repository.
+  *
+  * @method gitCommits
+  * @param {Array<Commit>} commits the created commits.
+  */
+export async function gitRepo() {
+  const dir = tempy.directory();
+
+  process.chdir(dir);
+  await mkdir('git-templates');
+  await execa('git', ['init', '--template=./git-templates']);
+}
+
+/**
+ * Create commits on the current git repository.
+ *
+ * @method gitCommits
+ * @param {Array<String>} messages commit messages
+ * @returns {Array<Commit>} commits the created commits, in reverse order (to match `git log` order)
+ */
+export async function gitCommits(messages) {
+  return (await pMapSeries(messages, async msg => {
+    const {stdout} = await execa('git', ['commit', '-m', msg, '--allow-empty', '--no-gpg-sign']);
+    const [, branch, hash, message] = /^\[(\w+)\(?.*?\)?(\w+)\] (.+)$/.exec(stdout);
+    return {branch, hash, message};
+  })).reverse();
+}
+
+/**
+ * Checkout a branch on the current git repository.
+ *
+ * @param {String} branch Branch name
+ * @param {Boolean} create `true` to create the branche ans switch, `false` to only switch
+ */
+export async function gitCheckout(branch, create) {
+  await execa('git', ['checkout', create ? '-b' : null, branch]);
+}
+
+/**
+ * Get the sha of the head commit in the current git repository.
+ * 
+ * @return {String} The sha of the head commit in the current git repository.
+ */
+export async function gitHead() {
+  return (await execa('git', ['rev-parse', 'HEAD'])).stdout;
+}

test/helpers/mock-github.js

@@ -0,0 +1,7 @@
+import nock from 'nock';
+
+export function authenticate(
+  {githubToken = 'GH_TOKEN', githubUrl = 'https://api.github.com', githubApiPathPrefix = ''} = {}
+) {
+  return nock(`${githubUrl}/${githubApiPathPrefix}`, {reqheaders: {Authorization: `token ${githubToken}`}});
+}

test/helpers/registry/index.js

@@ -0,0 +1,14 @@
+import execa from 'execa';
+
+const opts = {cwd: __dirname};
+
+export const uri =
+  'http://localhost:' + (process.env.TRAVIS === 'true' ? 5984 : 15986) + '/registry/_design/app/_rewrite/';
+
+export function start() {
+  return execa('./start.sh', opts);
+}
+
+export function stop() {
+  return execa('./stop.sh', opts);
+}

test/helpers/registry/local.ini

@@ -0,0 +1,20 @@
+[couchdb]
+database_dir = data
+view_index_dir = data
+delayed_commits = false
+uuid = bf4ecd84a7c89d60b5b2540fdf8c322c
+
+[couch_httpd_auth]
+public_fields = appdotnet, avatar, avatarMedium, avatarLarge, date, email, fields, freenode, fullname, github, homepage, name, roles, twitter, type, _id, _rev
+users_db_public = true
+
+[httpd]
+port = 15986
+bind_address = 127.0.0.1
+secure_rewrites = false
+
+[log]
+file = couch/couch.log
+
+[admins]
+admin = -pbkdf2-89582b49cd2e8443e29a841f5a76d367956a8e58,1afa2f1531a17ac97f2ac9e334293753,10

test/helpers/registry/start.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+# exit if an error occurs
+set -e
+
+cd $(dirname $0)
+
+mkdir -p couch
+
+if [[ $TRAVIS = true ]]
+then
+  COUCH=http://admin:password@127.0.0.1:5984
+
+  curl -X PUT http://127.0.0.1:5984/_config/admins/admin -d '"password"'
+
+  curl -X PUT $COUCH/_config/couchdb/delayed_commits -d '"false"'
+  curl -X PUT $COUCH/_config/couch_httpd_auth/users_db_public -d '"true"'
+  curl -X PUT $COUCH/_config/couch_httpd_auth/public_fields -d '"appdotnet, avatar, avatarMedium, avatarLarge, date, email, fields, freenode, fullname, github, homepage, name, roles, twitter, type, _id, _rev"'
+  curl -X PUT $COUCH/_config/httpd/secure_rewrites -d '"false"'
+
+else
+  COUCH=http://admin:password@127.0.0.1:15986
+  couchdb -b -a local.ini -p couch/pid -o couch/stdout.log -e couch/stderr.log
+  # wait for couch to start
+  sleep 1
+fi
+
+# create "registry" database
+curl -X PUT $COUCH/registry
+
+# create sample npm user
+curl -X PUT $COUCH/_users/org.couchdb.user:integration -H Content-Type:application/json --data-binary '{"_id": "org.couchdb.user:integration", "name": "integration", "roles": [], "type": "user", "password": "suchsecure", "email": "integration@test.com"}'
+
+# npm-registry-couchpp needs this variable set to run
+export DEPLOY_VERSION=nope
+
+# setup npm-registry-couchapp
+npm explore npm-registry-couchapp -- npm start --npm-registry-couchapp:couch=$COUCH/registry
+npm explore npm-registry-couchapp -- npm run load --npm-registry-couchapp:couch=$COUCH/registry
+export NO_PROMPT=yes
+npm explore npm-registry-couchapp -- npm run copy --npm-registry-couchapp:couch=$COUCH/registry

test/helpers/registry/stop.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# close couchdb background process
+couchdb -d
+
+# delete data and logs
+cd $(dirname $0)
+
+cat couch/{couch,stdout,stderr}.log
+
+cat couch/pid | xargs kill
+rm -rf couch
+rm -rf data