ensure lifecycle ordering

nb-apis/nb-api/src/test/java/io/nosqlbench/nb/api/components/core/NBComponentExecutionScopeTest.java

@@ -0,0 +1,70 @@
+package io.nosqlbench.nb.api.components.core;
+
+import io.nosqlbench.nb.api.components.events.NBEvent;
+import io.nosqlbench.nb.api.config.standard.TestComponent;
+import org.apache.commons.logging.Log;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class NBComponentExecutionScopeTest {
+
+    @Test
+    public void verifyComponentLifecycleHooks() {
+        List<String> log = new ArrayList<>();
+        try (LoggerComponent parent = new LoggerComponent(log, "parent", "parent")) {
+            LoggerComponent child = new LoggerComponent(parent, log, "child", "child");
+        }
+        String concatLog = log.stream().collect(Collectors.joining("\n"));
+        assertThat(concatLog).matches(Pattern.compile(
+            """
+                LoggerComponent .parent="parent".->detachChild
+                LoggerComponent .child="child",parent="parent".->beforeDetach
+                LoggerComponent .child="child",parent="parent".<-beforeDetach
+                LoggerComponent .parent="parent".<-detachChild""",
+            Pattern.MULTILINE
+        ));
+    }
+
+    private final static class LoggerComponent extends TestComponent {
+        public final List<String> _log;
+
+        public LoggerComponent(List<String> log, String... labels) {
+            super(labels);
+            this._log = log;
+        }
+
+        public LoggerComponent(NBComponent parent, List<String> log, String... labels) {
+            super(parent, labels);
+            this._log = log;
+        }
+
+
+        @Override
+        public void beforeDetach() {
+            _log.add(description() + "->beforeDetach");
+            super.beforeDetach();
+            _log.add(description() + "<-beforeDetach");
+        }
+
+        @Override
+        public void onEvent(NBEvent event) {
+            _log.add(event.toString());
+        }
+
+        @Override
+        public NBComponent detachChild(NBComponent... children) {
+            _log.add(description() + "->detachChild");
+            NBComponent result = super.detachChild(children);
+            _log.add(description() + "<-detachChild");
+            return result;
+        }
+
+    }
+}