### Question:
ResponseStateManagerWrapper extends ResponseStateManager implements
		FacesWrapper<ResponseStateManager> { @Override public boolean isPostback(FacesContext context) { return getWrapped().isPostback(context); }  abstract ResponseStateManager getWrapped(); @Override void writeState(FacesContext context, Object state); @Override @Deprecated void writeState(FacesContext context, SerializedView state); @Override Object getState(FacesContext context, String viewId); @Override @Deprecated Object getTreeStructureToRestore(FacesContext context, String viewId); @Override @Deprecated Object getComponentStateToRestore(FacesContext context); @Override boolean isPostback(FacesContext context); @Override String getViewState(FacesContext context, Object state);  }### Answer:
@Test public void shouldWrapIsPostback() { this.wrapper.isPostback(this.context); verify(this.wrapped).isPostback(this.context); }