Add istanbul to gulp task test

Closes simcaq/SCRUM#20

README.md

@@ -16,9 +16,9 @@ Previous versions of Node.js do not support ECMAScript6, it is recommended to us
 
 > nvm use v4.5.0
 
-4) Install babel and gulp globally
+4) Install the global dependencies
 
-> npm install --global gulp gulp-cli babel babel-cli babel-core babel-register mocha gulp-mocha gulp-eslint
+> npm install --global gulp gulp-cli babel babel-cli babel-core babel-register mocha gulp-mocha gulp-eslint istanbul
 
 5) Install project dependencies
 

gulpfile.babel.js

@@ -8,6 +8,8 @@ const eslint = require('gulp-eslint');
 
 const mocha = require('gulp-mocha');
 
+const istanbul = require('gulp-istanbul');
+
 const nodemon = require('gulp-nodemon');
 
 const Cache = require('gulp-file-cache');
@@ -61,10 +63,18 @@ gulp.task('docco', () => {
 
 gulp.task('doc', ['docco']);
 
-gulp.task('test', () => {
+gulp.task('pre-test', () => {
+    return gulp.src(['build/**/*.js', '!build/{test,test/**}'])
+        .pipe(istanbul())
+        .pipe(istanbul.hookRequire());
+});
+
+gulp.task('test', ['pre-test'], () => {
     process.chdir('build');
     gulp.src('test/test.js', {read: false})
     .pipe(mocha())
+    .pipe(istanbul.writeReports())
+    .pipe(istanbul.enforceThresholds({ thresholds: { global: 90 } }))
     .once('error', () => {
         process.exit(1);
     })

package.json

@@ -52,6 +52,7 @@
     "gulp-eslint": "^3.0.1",
     "gulp-file-cache": "0.0.1",
     "gulp-function": "^1.3.6",
+    "gulp-istanbul": "^1.1.1",
     "gulp-jsdoc3": "^0.3.0",
     "gulp-mocha": "^3.0.1",
     "gulp-nodemon": "^2.1.0",