/**
* Akin to {@link JenkinsRule#configRoundtrip(Builder)}.
*
* @param <S> step type
* @param before the incoming step
* @return the result after displaying in a form and resaving
*/
@SuppressWarnings("unchecked")
public <S extends Step> S configRoundTrip(S before) throws Exception {
FreeStyleProject p = rule.createFreeStyleProject();
p.getBuildersList().add(new StepBuilder(before));
// workaround for eclipse compiler Ambiguous method call
p = (FreeStyleProject) rule.configRoundtrip((Item) p);
StepBuilder b = p.getBuildersList().get(StepBuilder.class);
assertNotNull(b);
Step after = b.s;
assertNotNull(after);
assertEquals(before.getClass(), after.getClass());
return (S) after;
}