[GitHub] [flink] dmvk commented on a diff in pull request #22140: [FLINK-31385] Introduce extended Assertj matchers for completable fut…

["dmvk (via GitHub)" <gi...@apache.org>]

dmvk commented on code in PR #22140:
URL: https://github.com/apache/flink/pull/22140#discussion_r1132307750


##########
flink-test-utils-parent/flink-test-utils-junit/src/main/java/org/apache/flink/core/testutils/FlinkCompletableFutureAssert.java:
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@@ -0,0 +1,104 @@
+/*
+ * 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.core.testutils;
+
+import org.assertj.core.api.AbstractCompletableFutureAssert;
+import org.assertj.core.api.AssertionInfo;
+import org.assertj.core.api.ObjectAssert;
+import org.assertj.core.api.ThrowableAssertAlternative;
+import org.assertj.core.error.BasicErrorMessageFactory;
+import org.assertj.core.internal.Failures;
+import org.assertj.core.internal.Objects;
+
+import java.time.Duration;
+import java.util.concurrent.CancellationException;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionStage;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+
+/**
+ * Enhanced version of {@link org.assertj.core.api.CompletableFutureAssert}, that allows asserting
+ * futures without relying on timeouts.
+ *
+ * @param <T> type of the value contained in the {@link CompletableFuture}.
+ */
+public class FlinkCompletableFutureAssert<T>
+        extends AbstractCompletableFutureAssert<FlinkCompletableFutureAssert<T>, T> {
+
+    private static final String SHOULD_HAVE_SUCCEEDED = "%nExpecting%n  <%s>%nto have succeeded.%n";
+
+    private static final String SHOULD_HAVE_FAILED = "%nExpecting%n  <%s>%nto have failed.%n";
+
+    FlinkCompletableFutureAssert(CompletableFuture<T> actual) {
+        super(actual, FlinkCompletableFutureAssert.class);
+    }
+
+    FlinkCompletableFutureAssert(CompletionStage<T> actual) {
+        super(actual.toCompletableFuture(), FlinkCompletableFutureAssert.class);
+    }
+
+    /**
+     * An equivalent of {@link #succeedsWithin(Duration)}, that doesn't rely on timeouts.
+     *
+     * @return a new assertion object on the future's result
+     */
+    public ObjectAssert<T> eventuallySucceeds() {
+        final T object = assertEventuallySucceeds(info, actual);
+        return new ObjectAssert<>(object);
+    }
+
+    /**
+     * An equivalent of {@link #failsWithin(Duration)}, that doesn't rely on timeouts.
+     *
+     * @param exceptionClass type of the exception we expect the future to complete with
+     * @return a new assertion instance on the future's exception.
+     * @param <E> type of the exception we expect the future to complete with
+     */
+    public <E extends Throwable> ThrowableAssertAlternative<E> eventuallyFailsWith(

Review Comment:
   We don't need it, be it would certainly be nice to have :) Added.



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