attempt to fix QosTimerTest (#3876)

Signed-off-by: Sally MacFarlane <sally.macfarlane@consensys.net>
Co-authored-by: Jason Frame <jasonwframe@gmail.com>

ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/QosTimerTest.java

@@ -14,7 +14,10 @@
  */
 package org.hyperledger.besu.ethereum.api.jsonrpc.internal;
 
-import java.util.concurrent.atomic.AtomicInteger;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+import java.util.concurrent.TimeoutException;
 
 import io.vertx.core.Vertx;
 import io.vertx.ext.unit.Async;
@@ -32,63 +35,46 @@ public class QosTimerTest {
   @Test
   public void shouldExecuteConsecutivelyAtTimeout(final TestContext ctx) {
     final long TEST_QOS_TIMEOUT = 100L;
-    final Async async = ctx.async();
-    final AtomicInteger execCount = new AtomicInteger(0);
-    new QosTimer(vertx, TEST_QOS_TIMEOUT, z -> execCount.incrementAndGet());
-
-    vertx.setTimer(
-        250L,
-        z -> {
-          ctx.assertEquals(2, execCount.get());
-          async.complete();
-        });
+    final int INVOCATIONS_COUNT = 2;
+    final Async async = ctx.async(INVOCATIONS_COUNT);
+    final long startTime = System.currentTimeMillis();
+    new QosTimer(vertx, TEST_QOS_TIMEOUT, z -> async.countDown());
+    async.awaitSuccess();
+    final long executionTime = System.currentTimeMillis() - startTime;
+    assertThat(executionTime)
+        .as("Execution ended ahead of time")
+        .isGreaterThanOrEqualTo(TEST_QOS_TIMEOUT * INVOCATIONS_COUNT);
   }
 
   @Test
   public void shouldExecuteOnceAtTimeout(final TestContext ctx) {
     final long TEST_QOS_TIMEOUT = 75L;
     final Async async = ctx.async();
-    final AtomicInteger execCount = new AtomicInteger(0);
-    new QosTimer(vertx, TEST_QOS_TIMEOUT, z -> execCount.incrementAndGet());
-
-    vertx.setTimer(
-        100L,
-        z -> {
-          ctx.assertEquals(1, execCount.get());
-          async.complete();
-        });
+    final long startTime = System.currentTimeMillis();
+    new QosTimer(vertx, TEST_QOS_TIMEOUT, z -> async.countDown());
+    async.awaitSuccess();
+    final long executionTime = System.currentTimeMillis() - startTime;
+    assertThat(executionTime)
+        .as("Execution ended ahead of time")
+        .isGreaterThanOrEqualTo(TEST_QOS_TIMEOUT);
   }
 
   @Test
   public void shouldNotExecuteBeforeTimeout(final TestContext ctx) {
     final long TEST_QOS_TIMEOUT = 200L;
     final Async async = ctx.async();
-    final AtomicInteger execCount = new AtomicInteger(0);
-    new QosTimer(vertx, TEST_QOS_TIMEOUT, z -> execCount.incrementAndGet());
-
-    vertx.setTimer(
-        50L,
-        z -> {
-          ctx.assertEquals(0, execCount.get());
-          async.complete();
-        });
+    new QosTimer(vertx, TEST_QOS_TIMEOUT, z -> async.countDown());
+    assertThatThrownBy(() -> async.awaitSuccess(50L)).isInstanceOf(TimeoutException.class);
   }
 
   @Test
   public void shouldNotExecuteWhenReset(final TestContext ctx) {
     final long TEST_QOS_TIMEOUT = 50L;
     final Async async = ctx.async();
-    final AtomicInteger execCount = new AtomicInteger(0);
-    final var timer = new QosTimer(vertx, TEST_QOS_TIMEOUT, z -> execCount.incrementAndGet());
-
+    final var timer = new QosTimer(vertx, TEST_QOS_TIMEOUT, z -> async.countDown());
     // reset QoS timer every 25 millis
     vertx.setPeriodic(25L, z -> timer.resetTimer());
-
-    vertx.setTimer(
-        200L,
-        z -> {
-          ctx.assertEquals(0, execCount.get());
-          async.complete();
-        });
+    assertThatThrownBy(() -> async.awaitSuccess(200L)).isInstanceOf(TimeoutException.class);
+    async.complete();
   }
 }