public void beans_are_injected() {
        Assertions.assertThat( testBean ).isNotNull();
    }
example for a Spring Bean that is used as a step
<p>
note this bean neither inherits from {@link com.tngtech.jgiven.Stage}
nor is annotated with the {@link JGivenStage} annotation, i.e. it is
possible (but not recommended) to use unmodified already existing
spring beans as stages.
<br>
jgiven-spring-junit5/src/test/java/com/tngtech/jgiven/integration/spring/junit5/test/SimpleTestSpringSteps.java