feat(tests): new scanner test

src/background/bt/cpu-usage.js

@@ -5,7 +5,7 @@ let keepTime = process.hrtime()
 let keepUsage = process.cpuUsage()
 let sw = false
 
-setInterval(() => {
+const cpuTimer = setInterval(() => {
 	if(!sw) {
 		keepTime = process.hrtime();
     	keepUsage = process.cpuUsage();
@@ -14,9 +14,11 @@ setInterval(() => {
 		startTime = keepTime;
 		startUsage = keepUsage;
 		sw = false;
-	} 
+  } 
 }, 500)
 
+cpuTimer.unref()
+
 module.exports = () => {
     function secNSec2ms (secNSec) {
       return secNSec[0] * 1000 + secNSec[1] / 1000000

src/background/bt/token.js

@@ -3,7 +3,8 @@
 module.exports = class {
 	constructor() {
 		this.generate()
-		setInterval(()=> this.generate(), 60000*15)
+		const it = setInterval(() => this.generate(), 60000*15)
+		it.unref()
 	}
 
 	isValid(t) {