feat: working wait

Author: bahmutov

package.json

@@ -70,7 +70,10 @@
     "test": "npm run unit",
     "unit": "mocha src/*-spec.js",
     "unused-deps": "dependency-check --unused --no-dev .",
-    "semantic-release": "semantic-release pre && npm publish && semantic-release post"
+    "semantic-release": "semantic-release pre && npm publish && semantic-release post",
+    "prestart": "sleep 5",
+    "start": "http-server -c-1 -p 8090 --quiet test",
+    "demo": "node bin/start.js http://127.0.0.1:8090"
   },
   "release": {
     "analyzeCommits": "simple-commit-message",
@@ -94,10 +97,16 @@
     "prettier-standard": "7.0.3",
     "semantic-release": "8.2.0",
     "simple-commit-message": "3.3.2",
-    "standard": "10.0.3"
+    "standard": "10.0.3",
+    "http-server": "0.10.0"
   },
   "dependencies": {
     "check-more-types": "2.24.0",
-    "lazy-ass": "1.6.0"
+    "lazy-ass": "1.6.0",
+    "execa": "0.8.0",
+    "wait-on": "2.0.2",
+    "bluebird": "3.5.1",
+    "debug": "3.1.0"
   }
 }
+

src/index.js

@@ -2,12 +2,53 @@
 
 const la = require('lazy-ass')
 const is = require('check-more-types')
+const execa = require('execa')
+const waitOn = require('wait-on')
+const Promise = require('bluebird')
+const debug = require('debug')('start-server-and-test')
 
 function startAndTest ({ start, url, test }) {
   la(is.unemptyString(start), 'missing start script name', start)
   la(is.unemptyString(test), 'missing test script name', test)
   la(is.url(url), 'missing url to wait on', url)
-  return Promise.resolve()
+
+  debug('starting server')
+  const server = execa('npm', ['run', start], { stdio: 'inherit' })
+  let serverStopped
+
+  function stopServer () {
+    if (!serverStopped) {
+      debug('stopping server')
+      server.kill()
+      serverStopped = true
+    }
+  }
+
+  const waited = new Promise((resolve, reject) => {
+    waitOn(
+      {
+        resources: [url]
+      },
+      err => {
+        if (err) {
+          debug('error waiting for url', url)
+          debug(err.message)
+          return reject(err)
+        }
+        resolve()
+      }
+    )
+  })
+
+  function runTests () {
+    debug('running test script command', test)
+    return execa('npm', ['run', test], { stdio: 'inherit' })
+  }
+
+  return waited
+    .tapCatch(stopServer)
+    .then(runTests)
+    .finally(stopServer)
 }
 
 module.exports = startAndTest