[tests] Added multi-language tests #6

  * Includes `microservice-examples` package
  * Adds "hello world" tests for all languages

package.json

@@ -33,6 +33,7 @@
   "devDependencies": {
     "express": "^4.14.0",
     "request": "^2.75.0",
+    "microservice-examples": "3.0.0"
     "tape": "^4.6.0"
   }
 }

test/all-languages-tests.js

@@ -0,0 +1,64 @@
+// all-languages-tests.js
+var test = require("tape");
+var express = require('express');
+var request = require('request');
+
+var stack, handler, app, server, examples;
+
+stack = require('../');
+
+// Remark: babel and coffee-script are commented out since they aren't included in the package
+// Even as devDependencies they are too big
+var languages = ['bash', /* 'babel', 'coffee-script', */ 'smalltalk', 'lua', 'javascript', 'perl', 'php', 'python', 'python3', 'ruby', 'scheme', 'tcl'];
+
+test('attempt to require microservice-examples module', function (t) {
+  examples = require('microservice-examples');
+  t.equal(typeof examples.services, "object", "returned services object");
+  t.end();
+});
+
+test('check if examples are available for all languages', function (t) {
+  languages.forEach(function (lang) {
+    t.equal(true, Object.keys(examples.services).indexOf(lang + '-hello-world') > 0, 'found example service for ' + lang);
+  });
+  t.end();
+});
+
+test('attempt to start server with handlers for all languages', function (t) {
+  app = express();
+  app.use(stack.plugins.bodyParser());
+  languages.forEach(function (lang) {
+    var service = examples.services[lang + '-hello-world'];
+    var handler = stack.spawn({
+      language: lang,
+      code: service.code
+    });
+    app.use('/' + lang, handler);
+    t.equal(typeof handler, "function", "/" + lang + " HTTP endpoint added");
+  });
+  server = app.listen(3000, function () {
+    t.end();
+  });
+});
+
+test('attempt to run hello world all languages', function (t) {
+  t.plan(languages.length);
+  languages.forEach(function (lang) {
+    request('http://localhost:3000/' + lang, function (err, res, body) {
+      var noCarriageReturn = ["perl", "scheme", "php"];
+      if (noCarriageReturn.indexOf(lang) !== -1) {
+        t.equal(body, 'hello world', 'got correct response from ' + lang);
+      } else {
+        t.equal(body, 'hello world\n', 'got correct response from ' + lang);
+      }
+    });
+  });
+});
+// TODO: request params test with JSON / language specific output
+
+test('attempt to end server', function (t) {
+  server.close(function(){
+    t.ok(true, "ended server");
+    t.end();
+  });
+});