Why doesn't autowired work on this object?

Question

Java

For example, here is my class for testing (we are testing a standard controller with a repository. Class names are random - this is just an example).
Above the class, I do not specify anything, except for @ExtendWith(MockitoExtension.class), as I understand it, spring boot will figure it out for itself that this is a test.
What I'm most interested in is why does employeeService autowire, but clock doesn't and throws a null pointer? And how to make it so that I can autowire this bean.

@ExtendWith(MockitoExtension.class)
class EmployeeServiceTest {

    @Mock
    ExampleRepository exampleRepository;
 @Autowired
    Clock clock;
 @Autowired
@InjectMocks
EmployeeService employeeService;
// methods omitted
}

Here is the cloak

@Configuration
public class TimeConfig {
    @Bean
    public Clock clock() {
        return Clock.systemDefaultZone();
    }
}