chore(build): add tdd task

gulpfile.js

@@ -31,13 +31,14 @@ const release = require('./scripts/release');
 
 const prebuild = gulp.series(clean, lint);
 const pretest = gulp.series(prebuild, build);
-const prerelease = gulp.series(pretest, test);
+const prerelease = gulp.series(pretest, test.test);
 
 module.exports = {
   'clean': clean,
   'lint': lint,
   'build': gulp.series(prebuild, build),
-  'test': gulp.series(pretest, test),
+  'tdd': gulp.series(clean, build, test.tdd),
+  'test': gulp.series(pretest, test.test),
   'release:patch': gulp.series(prerelease, release.patch),
   'release:minor': gulp.series(prerelease, release.minor),
   'release:major': gulp.series(prerelease, release.major),

package.json

@@ -13,6 +13,7 @@
     "clean": "gulp clean",
     "lint": "gulp lint",
     "build": "gulp build",
+    "tdd": "gulp tdd",
     "test": "gulp test",
     "release": "gulp release:minor",
     "release:patch": "gulp release:patch",

scripts/test/index.js

@@ -25,9 +25,33 @@
 const path = require('path');
 const gulp = require('gulp');
 const jasmine = require('gulp-jasmine');
+const build = require('../build');
 const config = require('../config');
 
-module.exports = function test() {
+/**
+ * Run unit test suite and exit.
+ *
+ * @return {WritableStream} The pipe stream.
+ */
+function test() {
   const spec = path.join(config.test, '**', '*.spec.js');
   return gulp.src(spec).pipe(jasmine());
+}
+
+/**
+ * Watch for changes, and run unit test suite on every change.
+ *
+ * @param {function} done The `done` callback.
+ * @return {void}
+ */
+function tdd(done) {
+  gulp.watch(path.join(config.dist, '**', '*.js'), test);
+  gulp.watch(path.join(config.src, '**', '*.js'), build);
+  gulp.watch(path.join(config.test, '**', '*.js'), test);
+  done();
+}
+
+module.exports = {
+  tdd,
+  test,
 };