longer sleep

Author: laurit

instrumentation/java-http-client/testing/src/main/java/io/opentelemetry/instrumentation/javahttpclient/AbstractJavaHttpClientTest.java

@@ -155,7 +155,7 @@ void cancelRequest() throws InterruptedException {
             });
 
     // sleep a bit to let the request start
-    Thread.sleep(100);
+    Thread.sleep(1_000);
     future.cancel(true);
     assertThatThrownBy(future::get).isInstanceOf(CancellationException.class);