Guice to set injector setter

Test.java

package com.github.masahitojp;

import com.github.masahitojp.provider.ClockProvider;
import com.google.inject.AbstractModule;
import com.google.inject.Guice;
import com.google.inject.Injector;
import org.junit.Before;
import org.junit.Test;

import java.time.Clock;
import java.time.Instant;
import java.time.ZoneId;

import static org.junit.Assert.*;


public class MainTest {
    Injector injector;
    @Before
    public void start() {
        injector = Guice.createInjector(new AbstractModule(){
            @Override
            protected void configure() {
                bind(ClockProvider.class).toInstance(new ClockProvider() {
                    private Clock clock = Clock.systemUTC();
                    @Override
                    public Clock clock() {
                        return clock;
                    }
                    @Override
                    public void set(Clock clock) {
                        this.clock = clock;
                    }

                    @Override
                    public Instant now() {
                        return Instant.now(this.clock());
                    }
                });
            }});
    }
    @Test
    public void test() {
        final Clock test = Clock.fixed(Instant.parse("2007-12-03T10:15:30.00Z"), ZoneId.of("UTC"));
        injector.getInstance(ClockProvider.class).set(test);

        TimeService timeService = injector.getInstance(TimeService.class);
        assertEquals(timeService.now(), test.millis());
    }
}