chore: add test for issue #281

cannot replicate the issue (anymore).

cloud-core/src/test/java/cloud/commandframework/issue/Issue281.java

@@ -0,0 +1,91 @@
+//
+// MIT License
+//
+// Copyright (c) 2021 Alexander Söderberg & Contributors
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+package cloud.commandframework.issue;
+
+import cloud.commandframework.CommandManager;
+import cloud.commandframework.TestCommandSender;
+import cloud.commandframework.exceptions.CommandExecutionException;
+import cloud.commandframework.execution.AsynchronousCommandExecutionCoordinator;
+import cloud.commandframework.internal.CommandRegistrationHandler;
+import cloud.commandframework.meta.CommandMeta;
+import cloud.commandframework.meta.SimpleCommandMeta;
+import java.util.concurrent.CompletionException;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.junit.jupiter.api.Test;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+/**
+ * Test for https://github.com/Incendo/cloud/issues/281.
+ */
+@SuppressWarnings("unchecked")
+class Issue281 {
+
+    @Test
+    void commandExceptionShouldNotBeSwallowed() {
+        // Arrange
+        final CommandManager<TestCommandSender> commandManager = new CommandManager<TestCommandSender>(
+                AsynchronousCommandExecutionCoordinator.<TestCommandSender>newBuilder().withSynchronousParsing().build(),
+                CommandRegistrationHandler.nullCommandRegistrationHandler()
+        ) {
+            @Override
+            public boolean hasPermission(
+                    @NonNull final TestCommandSender sender,
+                    @NonNull final String permission
+            ) {
+                return true;
+            }
+
+            @Override
+            public @NonNull CommandMeta createDefaultCommandMeta() {
+                return SimpleCommandMeta.empty();
+            }
+        };
+
+        final CustomException customException = new CustomException();
+
+        commandManager.command(
+                commandManager.commandBuilder("test")
+                        .handler((context) -> {
+                            throw customException;
+                        })
+                        .build()
+        );
+
+        // Act
+        final CompletionException exception = assertThrows(
+                CompletionException.class,
+                () -> commandManager.executeCommand(new TestCommandSender(), "test").join()
+        );
+
+        // Assert
+        assertThat(exception).hasCauseThat().isInstanceOf(CommandExecutionException.class);
+        assertThat(exception).hasCauseThat().hasCauseThat().isInstanceOf(CustomException.class);
+    }
+
+    @SuppressWarnings("serial")
+    private static final class CustomException extends RuntimeException {
+    }
+}