@Override
  public void addUnmatchedInvocation(IMockInvocation invocation) {
    if (invocation.getMockObject().isVerified()) {
      unmatchedInvocations.add(invocation);
    }
  }
A scope for interactions defined outside a then-block

@author Peter Niederwieser
spock-core/src/main/java/org/spockframework/mock/runtime/InteractionScope.java