Testing and Debugging
When you compose an expression using object fields, you can check it on the go, providing an object ID to deal with.
Remember, that "Checking the expression" shows the result expression in the text area, not the step result!
If you want to check a particular step, but not the entire scenario, you can use step testing
You can test the whole scenario by throwing an object in it.
Discover the test results in object or in logs.
Remember, that you can use scenario testing both for Running mode and Editing mode. Sometimes such a mechanism is useful not for testing, but for manual scenario execution.