spring-soap/persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/datajpadelete/DeleteInRelationshipsUnitTest.java

package com.baeldung.datajpadelete;

import com.baeldung.Application;
import com.baeldung.datajpadelete.entity.Book;
import com.baeldung.datajpadelete.entity.Category;
import com.baeldung.datajpadelete.repository.BookRepository;
import com.baeldung.datajpadelete.repository.CategoryRepository;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import static org.assertj.core.api.Assertions.assertThat;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = {Application.class})
public class DeleteInRelationshipsUnitTest {

    @Autowired
    private BookRepository bookRepository;

    @Autowired
    private CategoryRepository categoryRepository;

    @Before
    public void setup() {
        Book book1 = new Book("The Hobbit");
        Category category1 = new Category("Cat1", book1);
        categoryRepository.save(category1);

        Book book2 = new Book("All Quiet on the Western Front");
        Category category2 = new Category("Cat2", book2);
        categoryRepository.save(category2);
    }

    @After
    public void teardown() {
        bookRepository.deleteAll();
        categoryRepository.deleteAll();
    }

    @Test
    public void whenDeletingCategories_thenBooksShouldAlsoBeDeleted() {
        categoryRepository.deleteAll();

        assertThat(bookRepository.count()).isEqualTo(0);
        assertThat(categoryRepository.count()).isEqualTo(0);
    }

    @Test
    public void whenDeletingBooks_thenCategoriesShouldAlsoBeDeleted() {
        bookRepository.deleteAll();

        assertThat(bookRepository.count()).isEqualTo(0);
        assertThat(categoryRepository.count()).isEqualTo(2);
    }
}