(Chore) : used done callback to make sure the test only finishes once the timer finishe

Signed-off-by: Abhijay Jain <[email protected]>

Author: Abhijay007

test/tests/p5.Gain.js

@@ -36,7 +36,7 @@ describe('p5.Gain', function () {
         gain.connect(filter);
         gain.connect(filter.input);
       });
-      it('can set the output level of gain Node', () => {
+      it('can set the output level of gain node', (done) => {
         let osc = new p5.Oscillator('sine');
         let mainGainNode = new p5.Gain();
         let amplitude = new p5.Amplitude();
@@ -51,6 +51,7 @@ describe('p5.Gain', function () {
         mainGainNode.amp(0.5);
         setTimeout(function () {
           expect(amplitude.getLevel()).to.be.closeTo(0.25, 0.125);
+          done();
         }, 100);
       });
       it('can disconnect', function () {