Button last = assertHasButton(form, "Last");
ActivityOperation op = assertHasActivityOperation(last, "update target");
Value target = assertHasValue(last, "target");
StartNode start = assertHasStartNode(op);
FinishNode finish = assertHasFinishNode(op);
SetNode set = assertHasSetNode(op);
assertGenerated(assertHasExecutionEdge(op, start, set));
assertGenerated(assertHasExecutionEdge(op, set, finish));