diff --git a/engine-core/src/main/java/io/nosqlbench/engine/core/lifecycle/commands/fortesting/CMD_error.java b/engine-core/src/main/java/io/nosqlbench/engine/core/lifecycle/commands/fortesting/CMD_error.java
new file mode 100644
index 000000000..a352f1e3c
--- /dev/null
+++ b/engine-core/src/main/java/io/nosqlbench/engine/core/lifecycle/commands/fortesting/CMD_error.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2024 nosqlbench
+ *
+ * Licensed 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 io.nosqlbench.engine.core.lifecycle.commands.fortesting;
+
+import io.nosqlbench.engine.core.lifecycle.scenario.container.ContainerActivitiesController;
+import io.nosqlbench.engine.core.lifecycle.scenario.container.NBBufferedContainer;
+import io.nosqlbench.engine.core.lifecycle.scenario.container.NBCommandParams;
+import io.nosqlbench.engine.core.lifecycle.scenario.execution.NBBaseCommand;
+
+import java.io.PrintWriter;
+import java.io.Reader;
+
+public class CMD_error extends NBBaseCommand {
+
+
+    public CMD_error(NBBufferedContainer parentComponent, String stepName, String targetScenario) {
+        super(parentComponent, stepName, targetScenario);
+    }
+
+    @Override
+    public Object invoke(NBCommandParams params, PrintWriter stdout, PrintWriter stderr, Reader stdin, ContainerActivitiesController controller) {
+        throw new RuntimeException("Command '" + this + "' throws ERROR.");
+    }
+}
diff --git a/engine-core/src/main/java/io/nosqlbench/engine/core/lifecycle/commands/fortesting/CMD_ok.java b/engine-core/src/main/java/io/nosqlbench/engine/core/lifecycle/commands/fortesting/CMD_ok.java
new file mode 100644
index 000000000..88c8af3bf
--- /dev/null
+++ b/engine-core/src/main/java/io/nosqlbench/engine/core/lifecycle/commands/fortesting/CMD_ok.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2024 nosqlbench
+ *
+ * Licensed 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 io.nosqlbench.engine.core.lifecycle.commands.fortesting;
+
+import io.nosqlbench.engine.core.lifecycle.scenario.container.ContainerActivitiesController;
+import io.nosqlbench.engine.core.lifecycle.scenario.container.NBBufferedContainer;
+import io.nosqlbench.engine.core.lifecycle.scenario.container.NBCommandParams;
+import io.nosqlbench.engine.core.lifecycle.scenario.execution.NBBaseCommand;
+import io.nosqlbench.engine.core.lifecycle.scenario.execution.NBInvokableCommand;
+import io.nosqlbench.nb.api.labels.NBLabels;
+
+import java.io.PrintWriter;
+import java.io.Reader;
+
+public class CMD_ok extends NBBaseCommand {
+
+    public CMD_ok(NBBufferedContainer parentComponent, String stepName, String targetScenario) {
+        super(parentComponent, stepName, targetScenario);
+    }
+
+    @Override
+    public Object invoke(NBCommandParams params, PrintWriter stdout, PrintWriter stderr, Reader stdin, ContainerActivitiesController controller) {
+        stdout.write("Command '" + this.toString() + "' says OK and exits with no object or exception.");
+        for (String pkey : params.keySet()) {
+            stdout.println("diagnostic 'ok' command setting key '" + pkey + " to " + params.get(pkey));
+        }
+        return params;
+    }
+}
diff --git a/engine-core/src/main/java/io/nosqlbench/engine/core/lifecycle/commands/fortesting/INFO_error.java b/engine-core/src/main/java/io/nosqlbench/engine/core/lifecycle/commands/fortesting/INFO_error.java
new file mode 100644
index 000000000..816f8bfdf
--- /dev/null
+++ b/engine-core/src/main/java/io/nosqlbench/engine/core/lifecycle/commands/fortesting/INFO_error.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2024 nosqlbench
+ *
+ * Licensed 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 io.nosqlbench.engine.core.lifecycle.commands.fortesting;
+
+import io.nosqlbench.engine.core.lifecycle.scenario.execution.NBCommandInfo;
+import io.nosqlbench.engine.core.lifecycle.scenario.execution.NBInvokableCommand;
+import io.nosqlbench.nb.annotations.Service;
+
+@Service(value = NBCommandInfo.class,selector = "test_error")
+public class INFO_error extends NBCommandInfo {
+    @Override
+    public Class<? extends NBInvokableCommand> getType() {
+        return CMD_error.class;
+    }
+}
diff --git a/engine-core/src/main/java/io/nosqlbench/engine/core/lifecycle/commands/fortesting/INFO_test_ok.java b/engine-core/src/main/java/io/nosqlbench/engine/core/lifecycle/commands/fortesting/INFO_test_ok.java
new file mode 100644
index 000000000..4b0079f77
--- /dev/null
+++ b/engine-core/src/main/java/io/nosqlbench/engine/core/lifecycle/commands/fortesting/INFO_test_ok.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2024 nosqlbench
+ *
+ * Licensed 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 io.nosqlbench.engine.core.lifecycle.commands.fortesting;
+
+import io.nosqlbench.engine.core.lifecycle.scenario.execution.NBCommandInfo;
+import io.nosqlbench.engine.core.lifecycle.scenario.execution.NBInvokableCommand;
+import io.nosqlbench.nb.annotations.Service;
+
+@Service(value = NBCommandInfo.class,selector = "test_ok")
+public class INFO_test_ok extends NBCommandInfo {
+    @Override
+    public Class<? extends NBInvokableCommand> getType() {
+        return CMD_ok.class;
+    }
+}