Use typescript in tests

gulpfile.ts

@@ -91,8 +91,8 @@ gulp.src('./src/**/*.ts')
 gulp.task('mocha', () =>
 	gulp.src([])
 		.pipe(mocha({
-			exit: true
-			//compilers: 'ts:ts-node/register'
+			exit: true,
+			compilers: 'ts:ts-node/register'
 		} as any))
 );