assertThat(defaultEnv, notNullValue());
ConfigurableEnvironment env1 = new StandardServletEnvironment();
servlet.setEnvironment(env1); // should succeed
assertThat(servlet.getEnvironment(), sameInstance(env1));
try {
servlet.setEnvironment(new DummyEnvironment());
fail("expected IllegalArgumentException for non-configurable Environment");
}
catch (IllegalArgumentException ex) {
}
class CustomServletEnvironment extends StandardServletEnvironment { }