DispatcherServletTests.java 文件源码

public void testEnvironmentOperations() {
    DispatcherServlet servlet = new DispatcherServlet();
    ConfigurableEnvironment defaultEnv = servlet.getEnvironment();
    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 { }
    @SuppressWarnings("serial")
    DispatcherServlet custom = new DispatcherServlet() {
        @Override
        protected ConfigurableWebEnvironment createEnvironment() {
            return new CustomServletEnvironment();
        }
    };
    assertThat(custom.getEnvironment(), instanceOf(CustomServletEnvironment.class));
}