问Spring Boot JUnit 5测试失败，指针为空

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package com.safnas.unittesting.unittesting.business;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.when;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

import com.safnas.unittesting.unittesting.data.SomeDataService;

@ExtendWith(MockitoExtension.class)
class SomeBusinessMockTest {
    
    @InjectMocks
    SomeBusinessImpl business = new SomeBusinessImpl();
    
    @Mock
    SomeDataService dataServiceMock;
    
    @Test
    void calculateSumUsingDataService_basic() {
        when(dataServiceMock.retrieveAllData()).thenReturn(new int[] {1,2,3});
        assertEquals(6, business.calculateSumUsingDataService());
    }
    
    @Test
    void calculateSum_empty() {
        when(dataServiceMock.retrieveAllData()).thenReturn(new int[] {});
        assertEquals(0, business.calculateSumUsingDataService());
    }
    
    @Test
    void calculateSum_oneValue() {
        when(dataServiceMock.retrieveAllData()).thenReturn(new int[] {5});
        assertEquals(5, business.calculateSumUsingDataService());
    }

}