Add test coverage for starting a child workflow from a cancelled workflow context

Author: Quinn-With-Two-Ns

temporal-sdk/src/test/java/io/temporal/workflow/childWorkflowTests/ChildWorkflowStartInCancelledScopeTest.java

@@ -0,0 +1,60 @@
+package io.temporal.workflow.childWorkflowTests;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import io.temporal.client.WorkflowFailedException;
+import io.temporal.failure.CanceledFailure;
+import io.temporal.testing.internal.SDKTestWorkflowRule;
+import io.temporal.workflow.CancellationScope;
+import io.temporal.workflow.Workflow;
+import io.temporal.workflow.WorkflowInterface;
+import io.temporal.workflow.WorkflowMethod;
+import io.temporal.workflow.shared.TestWorkflows;
+import org.junit.Rule;
+import org.junit.Test;
+
+public class ChildWorkflowStartInCancelledScopeTest {
+
+  @Rule
+  public SDKTestWorkflowRule testWorkflowRule =
+      SDKTestWorkflowRule.newBuilder()
+          .setWorkflowTypes(TestParentWorkflowImpl.class, TestChildWorkflowImpl.class)
+          .build();
+
+  @Test
+  public void testStartChildInCancelledScope() {
+    TestParentWorkflow workflow = testWorkflowRule.newWorkflowStub(TestParentWorkflow.class);
+    try {
+      workflow.execute();
+      fail("unreachable");
+    } catch (WorkflowFailedException e) {
+      assertTrue(e.getCause() instanceof CanceledFailure);
+      CanceledFailure failure = (CanceledFailure) e.getCause();
+      assertTrue(failure.getOriginalMessage().contains("execute called from a cancelled scope"));
+      
+    }
+  }
+
+  @WorkflowInterface
+  public interface TestParentWorkflow {
+    @WorkflowMethod
+    void execute();
+  }
+
+  public static class TestParentWorkflowImpl implements TestParentWorkflow {
+    @Override
+    public void execute() {
+      TestWorkflows.NoArgsWorkflow child =
+          Workflow.newChildWorkflowStub(TestWorkflows.NoArgsWorkflow.class);
+      CancellationScope scope = Workflow.newCancellationScope(child::execute);
+      scope.cancel();
+      scope.run();
+    }
+  }
+
+  public static class TestChildWorkflowImpl implements TestWorkflows.NoArgsWorkflow {
+    @Override
+    public void execute() {}
+  }
+}