@Test
public void test_add_non_instantiable_plugin_classes()
{

    try
    {
        underTest.add(MyPlugin2.class);
        Assertions.failBecauseExceptionWasNotThrown(KernelException.class);
    } catch (KernelException e)
    {
        assertThat(e).hasMessage(String.format("Plugin %s can not be instantiated", MyPlugin2.class));
    }
}