Handle async completion in TestActivityEnvironment

temporal-sdk/src/test/java/io/temporal/internal/testing/ActivityTestingTest.java

@@ -31,6 +31,7 @@
 import io.temporal.client.ActivityCanceledException;
 import io.temporal.failure.ActivityFailure;
 import io.temporal.failure.ApplicationFailure;
+import io.temporal.testing.ActivityRequestedAsyncCompletion;
 import io.temporal.testing.TestActivityEnvironment;
 import java.io.IOException;
 import java.util.ArrayList;
@@ -39,10 +40,7 @@
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReference;
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Rule;
-import org.junit.Test;
+import org.junit.*;
 import org.junit.rules.Timeout;
 
 public class ActivityTestingTest {
@@ -111,6 +109,21 @@ public void testFailure() {
     }
   }
 
+  private static class AsyncActivityImpl implements TestActivity {
+    @Override
+    public String activity1(String input) {
+      Activity.getExecutionContext().doNotCompleteOnReturn();
+      return "";
+    }
+  }
+
+  @Test
+  public void testAsyncActivity() {
+    testEnvironment.registerActivitiesImplementations(new AsyncActivityImpl());
+    TestActivity activity = testEnvironment.newActivityStub(TestActivity.class);
+    Assert.assertThrows(ActivityRequestedAsyncCompletion.class, () -> activity.activity1("input1"));
+  }
+
   private static class HeartbeatActivityImpl implements TestActivity {
 
     @Override

temporal-testing/src/main/java/io/temporal/testing/ActivityRequestedAsyncCompletion.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2022 Temporal Technologies, Inc. All Rights Reserved.
+ *
+ * Copyright (C) 2012-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Modifications copyright (C) 2017 Uber Technologies, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this material 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 io.temporal.testing;
+
+/**
+ * Exception thrown when an activity request to complete asynchronously in the {@link
+ * TestActivityEnvironment}. Intended to be used in unit tests to assert an activity requested async
+ * completion.
+ */
+public final class ActivityRequestedAsyncCompletion extends RuntimeException {
+  private final String activityId;
+  private final boolean manualCompletion;
+
+  public ActivityRequestedAsyncCompletion(String activityId, boolean manualCompletion) {
+    super("activity requested async completion");
+    this.activityId = activityId;
+    this.manualCompletion = manualCompletion;
+  }
+
+  public String getActivityId() {
+    return activityId;
+  }
+
+  public boolean isManualCompletion() {
+    return manualCompletion;
+  }
+}

temporal-testing/src/main/java/io/temporal/testing/TestActivityEnvironment.java

@@ -82,6 +82,9 @@ static TestActivityEnvironment newInstance(TestEnvironmentOptions options) {
    * Creates a stub that can be used to invoke activities registered through {@link
    * #registerActivitiesImplementations(Object...)}.
    *
+   * <p>Activity methods may throw {@link ActivityRequestedAsyncCompletion} if the activity
+   * requested async completion.
+   *
    * @param activityInterface activity interface class that the object under test implements.
    * @param <T> Type of the activity interface.
    * @return The stub that implements the activity interface.
@@ -92,6 +95,9 @@ static TestActivityEnvironment newInstance(TestEnvironmentOptions options) {
    * Creates a stub that can be used to invoke activities registered through {@link
    * #registerActivitiesImplementations(Object...)}.
    *
+   * <p>Activity methods may throw {@link ActivityRequestedAsyncCompletion} if the activity
+   * requested async completion.
+   *
    * @param <T> Type of the activity interface.
    * @param activityInterface activity interface class that the object under test implements
    * @param options options that specify the activity invocation parameters

temporal-testing/src/main/java/io/temporal/testing/TestActivityEnvironmentInternal.java

@@ -20,7 +20,6 @@
 
 package io.temporal.testing;
 
-import com.google.common.base.Defaults;
 import com.google.protobuf.ByteString;
 import com.uber.m3.tally.NoopScope;
 import com.uber.m3.tally.Scope;
@@ -511,40 +510,38 @@ private <T> T getReply(
         Type resultType) {
       DataConverter dataConverter =
           testEnvironmentOptions.getWorkflowClientOptions().getDataConverter();
-      RespondActivityTaskCompletedRequest taskCompleted = response.getTaskCompleted();
-      if (taskCompleted != null) {
+      if (response.getTaskCompleted() != null) {
+        RespondActivityTaskCompletedRequest taskCompleted = response.getTaskCompleted();
         Optional<Payloads> result =
             taskCompleted.hasResult() ? Optional.of(taskCompleted.getResult()) : Optional.empty();
         return dataConverter.fromPayloads(0, result, resultClass, resultType);
-      } else {
+      } else if (response.getTaskFailed() != null) {
         RespondActivityTaskFailedRequest taskFailed =
             response.getTaskFailed().getTaskFailedRequest();
-        if (taskFailed != null) {
-          Exception cause = dataConverter.failureToException(taskFailed.getFailure());
-          throw new ActivityFailure(
-              taskFailed.getFailure().getMessage(),
-              0,
-              0,
-              task.getActivityType().getName(),
-              task.getActivityId(),
-              RetryState.RETRY_STATE_NON_RETRYABLE_FAILURE,
-              "TestActivityEnvironment",
-              cause);
-        } else {
-          RespondActivityTaskCanceledRequest taskCanceled = response.getTaskCanceled();
-          if (taskCanceled != null) {
-            throw new CanceledFailure(
-                "canceled",
-                new EncodedValues(
-                    taskCanceled.hasDetails()
-                        ? Optional.of(taskCanceled.getDetails())
-                        : Optional.empty(),
-                    dataConverter),
-                null);
-          }
-        }
+        Exception cause = dataConverter.failureToException(taskFailed.getFailure());
+        throw new ActivityFailure(
+            taskFailed.getFailure().getMessage(),
+            0,
+            0,
+            task.getActivityType().getName(),
+            task.getActivityId(),
+            RetryState.RETRY_STATE_NON_RETRYABLE_FAILURE,
+            "TestActivityEnvironment",
+            cause);
+      } else if (response.getTaskCanceled() != null) {
+        RespondActivityTaskCanceledRequest taskCanceled = response.getTaskCanceled();
+        throw new CanceledFailure(
+            "canceled",
+            new EncodedValues(
+                taskCanceled.hasDetails()
+                    ? Optional.of(taskCanceled.getDetails())
+                    : Optional.empty(),
+                dataConverter),
+            null);
+      } else {
+        throw new ActivityRequestedAsyncCompletion(
+            task.getActivityId(), response.isManualCompletion());
       }
-      return Defaults.defaultValue(resultClass);
     }
 
     @Override