zentol commented on a change in pull request #13964:
URL: https://github.com/apache/flink/pull/13964#discussion_r539469557



##########
File path: 
flink-runtime/src/test/java/org/apache/flink/runtime/jobmaster/slotpool/DeclarativeSlotPoolBridgeTest.java
##########
@@ -0,0 +1,209 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.jobmaster.slotpool;
+
+import org.apache.flink.api.common.JobID;
+import org.apache.flink.api.common.time.Time;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.concurrent.ComponentMainThreadExecutor;
+import 
org.apache.flink.runtime.concurrent.ComponentMainThreadExecutorServiceAdapter;
+import org.apache.flink.runtime.concurrent.FutureUtils;
+import 
org.apache.flink.runtime.jobmanager.scheduler.NoResourceAvailableException;
+import org.apache.flink.runtime.jobmaster.JobMasterId;
+import org.apache.flink.runtime.jobmaster.RpcTaskManagerGateway;
+import org.apache.flink.runtime.jobmaster.SlotRequestId;
+import org.apache.flink.runtime.slots.ResourceRequirement;
+import org.apache.flink.runtime.taskexecutor.TestingTaskExecutorGatewayBuilder;
+import org.apache.flink.runtime.taskmanager.LocalTaskManagerLocation;
+import org.apache.flink.util.ExceptionUtils;
+import org.apache.flink.util.TestLogger;
+import org.apache.flink.util.clock.SystemClock;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import javax.annotation.Nonnull;
+
+import java.time.Duration;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.fail;
+
+/**
+ * Tests for the {@link DeclarativeSlotPoolBridge}.
+ */
+public class DeclarativeSlotPoolBridgeTest extends TestLogger {
+
+       private static final Time rpcTimeout = Time.seconds(20);
+       private static final JobID jobId = new JobID();
+       private static final JobMasterId jobMasterId = JobMasterId.generate();
+       private final ComponentMainThreadExecutor mainThreadExecutor = 
ComponentMainThreadExecutorServiceAdapter.forMainThread();
+
+       @Test
+       public void testSlotOffer() throws Exception {
+               final SlotRequestId slotRequestId = new SlotRequestId();
+               final AllocationID expectedAllocationId = new AllocationID();
+               final PhysicalSlot allocatedSlot = 
createAllocatedSlot(expectedAllocationId);
+
+               final TestingDeclarativeSlotPoolFactory 
declarativeSlotPoolFactory = new 
TestingDeclarativeSlotPoolFactory(TestingDeclarativeSlotPool.builder());
+               try (DeclarativeSlotPoolBridge declarativeSlotPoolBridge = 
createDeclarativeSlotPoolBridge(declarativeSlotPoolFactory)) {
+
+                       declarativeSlotPoolBridge.start(jobMasterId, 
"localhost", mainThreadExecutor);
+
+                       CompletableFuture<PhysicalSlot> slotAllocationFuture = 
declarativeSlotPoolBridge.requestNewAllocatedSlot(slotRequestId, 
ResourceProfile.UNKNOWN, null);
+
+                       
declarativeSlotPoolBridge.newSlotsAreAvailable(Collections.singleton(allocatedSlot));
+
+                       slotAllocationFuture.join();
+               }
+       }
+
+       @Test
+       public void testNotEnoughResourcesAvailableFailsPendingRequests() 
throws Exception {
+               final SlotRequestId slotRequestId = new SlotRequestId();
+
+               final TestingDeclarativeSlotPoolFactory 
declarativeSlotPoolFactory = new 
TestingDeclarativeSlotPoolFactory(TestingDeclarativeSlotPool.builder());
+               try (DeclarativeSlotPoolBridge declarativeSlotPoolBridge = 
createDeclarativeSlotPoolBridge(declarativeSlotPoolFactory)) {
+
+                       declarativeSlotPoolBridge.start(jobMasterId, 
"localhost", mainThreadExecutor);
+
+                       CompletableFuture<PhysicalSlot> slotAllocationFuture = 
CompletableFuture
+                                       .supplyAsync(() -> 
declarativeSlotPoolBridge.requestNewAllocatedSlot(slotRequestId, 
ResourceProfile.UNKNOWN, Time.minutes(5)), mainThreadExecutor)
+                                       .get();
+
+                       mainThreadExecutor.execute(() -> 
declarativeSlotPoolBridge.notifyNotEnoughResourcesAvailable(Collections.emptyList()));
+
+                       try {
+                               slotAllocationFuture.join();
+                               Assert.fail();
+                       } catch (Exception e) {
+                               Optional<NoResourceAvailableException> 
expectedException = ExceptionUtils.findThrowable(e, 
NoResourceAvailableException.class);
+                               assertThat(expectedException.isPresent(), 
is(true));

Review comment:
       `containsCause` is a bit annoying since it also does an exact match 
against the error message, which tends to just create maintenance overhead down 
the line.
   I will use `futureWillCompleteExceptionally`.




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