clock.useFakeTimersSafe() - doesn't stub setImmediate

sinonjs/sinon#960

lib/sinon-clock-singleton.js

@@ -18,6 +18,23 @@ const clock = {
 		clock.restore();
 		clockInstance = sinon.useFakeTimers.apply(sinon, arguments);
 	},
+	/**
+	 * Creates a sinon clock instance,
+	 * without stubbing `setImmediate`
+	 *
+	 * See
+	 * https://github.com/sinonjs/sinon/issues/960
+	 */
+	useFakeTimersSafe: function() {
+		const args = [].slice.call(arguments, 0);
+		const time = args.length ? args[0] : Date.now();
+		const stubbedMethods = args.length > 1 ?
+			// Stub everything except setImmediate
+			['Date', 'setInterval', 'clearInterval', 'setTimeout', 'clearTimeout'] :
+			args.slice(1);
+
+		clock.useFakeTimers.apply(clock, [time].concat(stubbedMethods))
+	},
 	tick: (ms) => {
 		if (!clockInstance) { clock.useFakeTimers();}
 		clockInstance.tick(ms);