@Test
public void testGetRegisteredExtension() {

    when(extensionRegistry.getExtensions()).thenReturn(extensionRegistry_test.getExtensions());
    List<Extension> extensions = butterflyFacadeImpl.getExtensions();
    assertNotNull(extensions);
    assertEquals(extensions.size(), 1);
    assertTrue(extensions.get(0) instanceof ButterflySpringBootExtension);
}