模拟String.valueof（）

Question

I'm testing my spring controller and trying to do the following

Controller

Authentication authentication = SecurityContextHolder.getContext()
            .getAuthentication();
    String role = String.valueOf(authentication.getAuthorities());
    if(role.contains("user")) {
        ...
    }

Test

@Test
public void testLoginUser() throws Exception {
    User user = new User();
    user.setLogin("user");
    user.setRoleid(1L);
    SecurityContextHolder.getContext().setAuthentication(new UsernamePasswordAuthenticationToken(user,user));
    when(String.valueOf(Collection.class)).thenReturn("user");

But I get

org.mockito.exceptions.misusing.MissingMethodInvocationException

I need my if block to be true and execute.
Is there any way it can be done?

Answer 1

Because
1. String class is final and you cant mock final classes with Mockito.
2. String.valueOf is a static metod and you cant mock static method with Mockito

From Mockito FAQ

What are the limitations of Mockito

 Needs java 1.5+ Cannot mock final classes // String is Final Cannot mock static methods... // String.valueOf is static 

Either mock authentication.getAuthorities() method or use Powermock .

This link might help.

Answer 2

String.valueOf is a static method and is not mocked by Mockito. Your expression will simply resolve to a String instance with the value "class java.util.Collection" .

Why does Mockito not mock static methods? .