fix: batchSpanProcessor test failing intermittently (#444)

Author: mayurkale22

packages/opentelemetry-tracing/test/export/BatchSpanProcessor.test.ts

@@ -60,16 +60,19 @@ describe('BatchSpanProcessor', () => {
     it('should create a BatchSpanProcessor instance', () => {
       const processor = new BatchSpanProcessor(exporter);
       assert.ok(processor instanceof BatchSpanProcessor);
+      processor.shutdown();
     });
 
     it('should create a BatchSpanProcessor instance with config', () => {
       const processor = new BatchSpanProcessor(exporter, defaultBufferConfig);
       assert.ok(processor instanceof BatchSpanProcessor);
+      processor.shutdown();
     });
 
     it('should create a BatchSpanProcessor instance with empty config', () => {
       const processor = new BatchSpanProcessor(exporter, {});
       assert.ok(processor instanceof BatchSpanProcessor);
+      processor.shutdown();
     });
   });
 
@@ -100,6 +103,7 @@ describe('BatchSpanProcessor', () => {
         processor.onEnd(span);
         assert.strictEqual(exporter.getFinishedSpans().length, 0);
       }
+      processor.shutdown();
     });
 
     it('should force flush when timeout exceeded', done => {