Security Manager

ProvideSecurityManager可以在你的测试中替换系统的security manager。

public void MyTest {
    private final MySecurityManager securityManager
     = new MySecurityManager();

    @Rule
    public final ProvideSecurityManager provideSecurityManager
     = new ProvideSecurityManager(securityManager);

    @Test
    public void overrideProperty() {
        assertEquals(securityManager, System.getSecurityManager());
    }
}

这个没研究透 例子不一定能跑，我自己也理解不了 以后再研究