Lab3 is done

build.gradle

@@ -14,6 +14,9 @@ repositories {
 
 dependencies {
 	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+	implementation 'com.h2database:h2:2.1.210'
+	implementation group: 'org.springdoc', name: 'springdoc-openapi-ui', version: '1.6.5'
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
 

src/main/java/np/something/controllers/MathController.java

@@ -1,50 +0,0 @@
-package np.something.controllers;
-
-import np.something.services.OperationsService;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RequestParam;
-import org.springframework.web.bind.annotation.RestController;
-
-@RestController
-public class MathController {
-    private final OperationsService operationsService;
-
-    public MathController(OperationsService operationsService) {
-        this.operationsService = operationsService;
-    }
-
-    @GetMapping("/sum")
-    public Object sum(
-            @RequestParam(value = "value1", defaultValue = "0") String value1,
-            @RequestParam(value = "value2", defaultValue = "0") String value2,
-            @RequestParam(value = "ops", defaultValue = "intops") String ops
-            ) {
-        return operationsService.add(value1, value2, ops);
-    }
-
-    @GetMapping("/sub")
-    public Object sub(
-            @RequestParam(value = "value1", defaultValue = "0") String value1,
-            @RequestParam(value = "value2", defaultValue = "0") String value2,
-            @RequestParam(value = "ops", defaultValue = "intops") String ops
-    ) {
-        return operationsService.sub(value1, value2, ops);
-    }
-
-    @GetMapping("/mul")
-    public Object mul(
-            @RequestParam(value = "value", defaultValue = "0") String value,
-            @RequestParam(value = "count", defaultValue = "0") int count,
-            @RequestParam(value = "ops", defaultValue = "intops") String ops
-    ) {
-        return operationsService.mul(value, count, ops);
-    }
-
-    @GetMapping("/invert")
-    public Object div(
-            @RequestParam(value = "value", defaultValue = "0") String value,
-            @RequestParam(value = "ops", defaultValue = "intops") String ops
-    ) {
-        return operationsService.invert(value, ops);
-    }
-}

src/main/java/np/something/model/Comment.java

@@ -0,0 +1,68 @@
+package np.something.model;
+
+import jakarta.persistence.*;
+
+import java.util.Objects;
+
+@Entity
+public class Comment {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    @Column
+    private String content;
+
+    @ManyToOne(fetch = FetchType.EAGER)
+    @JoinColumn(name="customer_fk")
+    private Customer customer;
+
+    @ManyToOne(fetch = FetchType.EAGER)
+    @JoinColumn(name="post_fk")
+    private Post post;
+
+    public Comment() {
+
+    }
+
+    public Comment(Customer customer, Post post, String content) {
+        this.customer = customer;
+        this.post = post;
+        this.content = content;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public Post getPost() {
+        return post;
+    }
+
+    public Customer getCustomer() {
+        return customer;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Comment comment = (Comment) o;
+
+        return Objects.equals(id, comment.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+}

src/main/java/np/something/model/Customer.java

@@ -0,0 +1,72 @@
+package np.something.model;
+
+import jakarta.persistence.*;
+
+import java.util.*;
+
+@Entity
+public class Customer {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+    @Column
+    private String username;
+    @Column
+    private String hashedPassword;
+    @OneToMany(fetch = FetchType.EAGER, mappedBy = "customer", cascade = CascadeType.ALL)
+    private List<Comment> comments;
+    @OneToMany(fetch = FetchType.EAGER, mappedBy = "customer", cascade = CascadeType.ALL)
+    private List<Post> posts;
+
+    public Customer() {
+
+    }
+
+    public Customer(String username, String hashedPassword) {
+        this.username = username;
+        this.hashedPassword = hashedPassword;
+        this.comments = new ArrayList<>();
+        this.posts = new ArrayList<>();
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getHashedPassword() {
+        return hashedPassword;
+    }
+
+    public List<Comment> getComments() {
+        return comments;
+    }
+
+    public List<Post> getPosts() {
+        return posts;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public void setHashedPassword(String hashedPassword) {
+        this.hashedPassword = hashedPassword;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null || getClass() != obj.getClass()) return false;
+        Customer customer = (Customer) obj;
+        return Objects.equals(id, customer.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+}

src/main/java/np/something/model/IntegerOperations.java

@@ -1,25 +0,0 @@
-package np.something.model;
-import org.springframework.stereotype.Component;
-
-@Component(value = "intops")
-public class IntegerOperations implements Operations<Integer> {
-    @Override
-    public Integer add(Integer first, Integer second) {
-        return first + second;
-    }
-
-    @Override
-    public Integer sub(Integer first, Integer second) {
-        return first - second;
-    }
-
-    @Override
-    public Integer mul(Integer value, int count) {
-        return value * count;
-    }
-
-    @Override
-    public Integer invert(Integer value) {
-        return ~value;
-    }
-}

src/main/java/np/something/model/Operations.java

@@ -1,8 +0,0 @@
-package np.something.model;
-
-public interface Operations<T> {
-    T add(T first, T second);
-    T sub(T first, T second);
-    T mul(T value, int count);
-    T invert(T value);
-}

src/main/java/np/something/model/Post.java

@@ -0,0 +1,80 @@
+package np.something.model;
+
+import jakarta.persistence.*;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+public class Post {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    @Column
+    private String title;
+
+    @Column
+    private String content;
+
+    @ManyToOne(fetch = FetchType.EAGER)
+    @JoinColumn(name = "customer_fk")
+    private Customer customer;
+
+    @OneToMany(fetch = FetchType.EAGER, mappedBy = "post", cascade = CascadeType.ALL)
+    private List<Comment> comments;
+
+    public Post() {
+
+    }
+
+    public Post(Customer customer, String title, String content) {
+        this.customer = customer;
+        this.title = title;
+        this.content = content;
+        this.comments = new ArrayList<>();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Post post = (Post) o;
+
+        return id.equals(post.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return id.hashCode();
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+
+    public List<Comment> getComments() {
+        return comments;
+    }
+
+    public Customer getCustomer() {
+        return customer;
+    }
+
+    public Long getId() {
+        return id;
+    }
+}

src/main/java/np/something/model/StringOperations.java

@@ -1,30 +0,0 @@
-package np.something.model;
-import org.springframework.stereotype.Component;
-
-@Component(value = "stringops")
-public class StringOperations implements Operations<String>{
-
-    @Override
-    public String add(String first, String second) {
-        return first + second;
-    }
-
-    @Override
-    public String sub(String first, String second) {
-        return first.replace(second, "");
-    }
-
-    @Override
-    public String mul(String value, int count) {
-        StringBuilder result = new StringBuilder();
-        for (int i = 0; i < count; i++) {
-            result.append(value);
-        }
-        return result.toString();
-    }
-
-    @Override
-    public String invert(String value) {
-        return new StringBuilder(value).reverse().toString();
-    }
-}

src/main/java/np/something/services/CommentService.java

@@ -0,0 +1,72 @@
+package np.something.services;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityNotFoundException;
+import jakarta.persistence.PersistenceContext;
+import jakarta.transaction.Transactional;
+import np.something.model.Comment;
+import np.something.model.Customer;
+import np.something.model.Post;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+
+import java.util.List;
+
+@Service
+public class CommentService {
+    @PersistenceContext
+    private EntityManager em;
+
+    @Transactional
+    public Comment findComment(Long id) {
+        final Comment comment = em.find(Comment.class, id);
+        if (comment == null) {
+            throw new EntityNotFoundException(String.format("Comment with id [%s] is not found", id));
+        }
+        return comment;
+    }
+
+    @Transactional
+    public List<Comment> findAllComments() {
+        return em.createQuery("select c from Comment c", Comment.class).getResultList();
+    }
+
+    @Transactional
+    public Comment addComment(Customer customer, Post post, String content) {
+        if (customer == null || post == null) {
+            throw new IllegalArgumentException("Invalid customer or post");
+        }
+        if (!StringUtils.hasText(content)) {
+            throw new IllegalArgumentException("Invalid comment's content");
+        }
+        final Comment comment = new Comment(customer, post, content);
+        comment.getCustomer().getComments().add(comment);
+        comment.getPost().getComments().add(comment);
+        em.persist(comment);
+        return comment;
+    }
+
+    @Transactional
+    public Comment updateComment(Long id, String content) {
+        if (!StringUtils.hasText(content)) {
+            throw new IllegalArgumentException("Comment's content is empty");
+        }
+        final Comment comment = findComment(id);
+        comment.setContent(content);
+        return em.merge(comment);
+    }
+
+    @Transactional
+    public Comment deleteComment(Long id) {
+        final Comment currentComment = findComment(id);
+        currentComment.getPost().getComments().remove(currentComment);
+        currentComment.getCustomer().getComments().remove(currentComment);
+        em.remove(currentComment);
+        return currentComment;
+    }
+
+    @Transactional
+    public void deleteAllComment() {
+        em.createQuery("delete from Comment").executeUpdate();
+    }
+}

src/main/java/np/something/services/CustomerService.java

@@ -0,0 +1,64 @@
+package np.something.services;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityNotFoundException;
+import jakarta.persistence.PersistenceContext;
+import jakarta.transaction.Transactional;
+import np.something.model.Customer;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+
+import java.util.List;
+
+@Service
+public class CustomerService {
+    @PersistenceContext
+    private EntityManager em;
+
+    @Transactional
+    public Customer findCustomer(Long id) {
+        final Customer customer = em.find(Customer.class, id);
+        if (customer == null) {
+            throw new EntityNotFoundException(String.format("User with id [%s] is not found", id));
+        }
+        return customer;
+    }
+
+    @Transactional
+    public List<Customer> findAllCustomers() {
+        return em.createQuery("select c from Customer c", Customer.class).getResultList();
+    }
+
+    @Transactional
+    public Customer addCustomer(String username, String password) {
+        if (!StringUtils.hasText(username) || !StringUtils.hasText(password)) {
+            throw new IllegalArgumentException("Customer's username or password is empty");
+        }
+        final Customer customer = new Customer(username, password);
+        em.persist(customer);
+        return customer;
+    }
+
+    @Transactional
+    public Customer updateCustomer(Long id, String username, String password) {
+        if (!StringUtils.hasText(username) || !StringUtils.hasText(password)) {
+            throw new IllegalArgumentException("Customer's username or password is empty");
+        }
+        final Customer customer = findCustomer(id);
+        customer.setUsername(username);
+        customer.setHashedPassword(password);
+        return em.merge(customer);
+    }
+
+    @Transactional
+    public Customer deleteCustomer(Long id) {
+        final Customer currentCustomer = findCustomer(id);
+        em.remove(currentCustomer);
+        return currentCustomer;
+    }
+
+    @Transactional
+    public void deleteAllCustomers() {
+        em.createQuery("delete from Customer").executeUpdate();
+    }
+}

src/main/java/np/something/services/OperationsService.java

@@ -1,45 +0,0 @@
-package np.something.services;
-import np.something.model.Operations;
-import org.springframework.context.ApplicationContext;
-import org.springframework.stereotype.Service;
-
-@Service
-public class OperationsService {
-    private final ApplicationContext applicationContext;
-
-    public OperationsService(ApplicationContext applicationContext) {
-        this.applicationContext = applicationContext;
-    }
-
-    public Object add(Object first, Object second, String ops) {
-        Operations operations = (Operations) applicationContext.getBean(ops);
-        if (ops.startsWith("int")) {
-            return operations.add(Integer.parseInt(first.toString()), Integer.parseInt(second.toString()));
-        }
-        return operations.add(first, second);
-    }
-
-    public Object sub(Object first, Object second, String ops) {
-        Operations operations = (Operations) applicationContext.getBean(ops);
-        if (ops.startsWith("int")) {
-            return operations.sub(Integer.parseInt(first.toString()), Integer.parseInt(second.toString()));
-        }
-        return operations.sub(first, second);
-    }
-
-    public Object mul(Object value, int count, String ops) {
-        Operations operations = (Operations) applicationContext.getBean(ops);
-        if (ops.startsWith("int")) {
-            return operations.mul(Integer.parseInt(value.toString()), count);
-        }
-        return operations.mul(value, count);
-    }
-
-    public Object invert(Object value, String ops) {
-        Operations operations = (Operations) applicationContext.getBean(ops);
-        if (ops.startsWith("int")) {
-            return operations.invert(Integer.parseInt(value.toString()));
-        }
-        return operations.invert(value);
-    }
-}

src/main/java/np/something/services/PostService.java

@@ -0,0 +1,71 @@
+package np.something.services;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityNotFoundException;
+import jakarta.persistence.PersistenceContext;
+import jakarta.transaction.Transactional;
+import np.something.model.Comment;
+import np.something.model.Customer;
+import np.something.model.Post;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+
+import java.util.List;
+
+@Service
+public class PostService {
+    @PersistenceContext
+    private EntityManager em;
+
+    @Transactional
+    public Post findPost(Long id) {
+        final Post post = em.find(Post.class, id);
+        if (post == null) {
+            throw new EntityNotFoundException(String.format("Post with id [%s] is not found", id));
+        }
+        return post;
+    }
+
+    @Transactional
+    public List<Post> findAllPosts() {
+        return em.createQuery("select p from Post p", Post.class).getResultList();
+    }
+
+    @Transactional
+    public Post addPost(Customer customer, String title, String content) {
+        if (customer == null) {
+            throw new IllegalArgumentException("Invalid customer");
+        }
+        if (!StringUtils.hasText(title) | !StringUtils.hasText(content)) {
+            throw new IllegalArgumentException("Invalid post's content or title");
+        }
+        final Post post = new Post(customer, title, content);
+        post.getCustomer().getPosts().add(post);
+        em.persist(post);
+        return post;
+    }
+
+    @Transactional
+    public Post updatePost(Long id, String title, String content) {
+        if (!StringUtils.hasText(content) | !StringUtils.hasText(title)) {
+            throw new IllegalArgumentException("Post's content or title is empty");
+        }
+        final Post post = findPost(id);
+        post.setTitle(title);
+        post.setContent(content);
+        return em.merge(post);
+    }
+
+    @Transactional
+    public Post deletePost(Long id) {
+        final Post currentPost = findPost(id);
+        currentPost.getCustomer().getPosts().remove(currentPost);
+        em.remove(currentPost);
+        return currentPost;
+    }
+
+    @Transactional
+    public void deleteAllPosts() {
+        em.createQuery("delete from Post").executeUpdate();
+    }
+}

src/main/resources/application.properties

@@ -1 +1,11 @@
-
+spring.main.banner-mode=off
+#server.port=8080
+spring.datasource.url=jdbc:h2:file:./data
+spring.datasource.driverClassName=org.h2.Driver
+spring.datasource.username=sa
+spring.datasource.password=password
+spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
+spring.jpa.hibernate.ddl-auto=update
+spring.h2.console.enabled=true
+spring.h2.console.settings.trace=false
+spring.h2.console.settings.web-allow-others=false

src/test/java/np/something/OperationsServiceTests.java

@@ -1,67 +0,0 @@
-package np.something;
-
-import np.something.services.OperationsService;
-import org.junit.jupiter.api.Assertions;
-import org.junit.jupiter.api.Test;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.test.context.SpringBootTest;
-
-@SpringBootTest
-class OperationsServiceTests {
-	@Autowired
-	OperationsService operationsService;
-
-	@Test
-	void stringSum() {
-		Assertions.assertEquals("Hello, World!", operationsService.add("Hello,", " World!", "stringops"));
-		Assertions.assertEquals("Hello, World!", operationsService.add("", "Hello, World!", "stringops"));
-	}
-
-	@Test
-	void stringSub() {
-		Assertions.assertEquals("Яблк", operationsService.sub("Яблоко", "о", "stringops"));
-		Assertions.assertEquals("Тлвизор", operationsService.sub("Телевизор", "е", "stringops"));
-		Assertions.assertEquals("Rewte", operationsService.sub("Rewrite", "ri", "stringops"));
-	}
-
-	@Test
-	void stringMul() {
-		Assertions.assertEquals("ДеревоДерево", operationsService.mul("Дерево", 2, "stringops"));
-		Assertions.assertEquals("ЛоЛоЛо", operationsService.mul("Ло", 3, "stringops"));
-		Assertions.assertEquals("", operationsService.mul("Слово", 0, "stringops"));
-	}
-
-	@Test
-	void stringInvert() {
-		Assertions.assertEquals("оволС", operationsService.invert("Слово", "stringops"));
-		Assertions.assertEquals("droW", operationsService.invert("Word", "stringops"));
-		Assertions.assertEquals("", operationsService.invert("", "stringops"));
-	}
-
-	@Test
-	void intSum() {
-		Assertions.assertEquals(22, operationsService.add(11, 11, "intops"));
-		Assertions.assertEquals(-10, operationsService.add(15, -25, "intops"));
-	}
-
-	@Test
-	void intSub() {
-		Assertions.assertEquals(0, operationsService.sub(10, 10, "intops"));
-		Assertions.assertEquals(100, operationsService.sub(100, 0, "intops"));
-		Assertions.assertEquals(3, operationsService.sub(-3, -6, "intops"));
-	}
-
-	@Test
-	void intMul() {
-		Assertions.assertEquals(0, operationsService.mul(0, 10, "intops"));
-		Assertions.assertEquals(18, operationsService.mul(6, 3, "intops"));
-		Assertions.assertEquals(-4, operationsService.mul(-1, 4, "intops"));
-	}
-
-	@Test
-	void intInvert() {
-		Assertions.assertEquals(0, operationsService.invert(-1, "intops"));
-		Assertions.assertEquals(-2, operationsService.invert(1, "intops"));
-		Assertions.assertEquals(-3, operationsService.invert(2, "intops"));
-	}
-}

src/test/java/np/something/SocialNetworkTest.java

@@ -0,0 +1,123 @@
+package np.something;
+
+import np.something.model.*;
+import np.something.services.CommentService;
+import np.something.services.CustomerService;
+import np.something.services.PostService;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+public class SocialNetworkTest {
+    @Autowired
+    CustomerService customerService;
+
+    @Autowired
+    CommentService commentService;
+
+    @Autowired
+    PostService postService;
+
+    @Test
+    void testCustomers() {
+        commentService.deleteAllComment();
+        postService.deleteAllPosts();
+        customerService.deleteAllCustomers();
+
+        Customer c1 = customerService.addCustomer("first", "1");
+        Customer c2 = customerService.addCustomer("second", "2");
+        Customer c3 = customerService.addCustomer("third", "3");
+
+        Assertions.assertEquals("first", c1.getUsername());
+        Assertions.assertEquals("second", c2.getUsername());
+        Assertions.assertEquals("third", c3.getUsername());
+
+        Assertions.assertEquals(c1, customerService.findCustomer(c1.getId()));
+
+        customerService.deleteCustomer(c2.getId());
+
+        Assertions.assertEquals(2, customerService.findAllCustomers().size());
+
+        Customer c4 = customerService.updateCustomer(c3.getId(), "fourth", "4");
+
+        Assertions.assertNotEquals(c3.getUsername(), c4.getUsername());
+        Assertions.assertNotEquals(c3.getHashedPassword(), c4.getHashedPassword());
+
+        commentService.deleteAllComment();
+        postService.deleteAllPosts();
+        customerService.deleteAllCustomers();
+    }
+
+    @Test
+    void testPost() {
+        commentService.deleteAllComment();
+        postService.deleteAllPosts();
+        customerService.deleteAllCustomers();
+
+        Customer c1 = customerService.addCustomer("first", "1");
+        Customer c2 = customerService.addCustomer("second", "2");
+
+        Post p1 = postService.addPost(c1, "first title", "nonsense");
+        Post p2 = postService.addPost(c2, "second title", "ordinal");
+
+        Assertions.assertEquals(2, postService.findAllPosts().size());
+
+        Assertions.assertEquals(p1.getCustomer(), c1);
+        Assertions.assertEquals(p2.getCustomer(), c2);
+
+        Assertions.assertEquals(c1.getPosts().get(0), p1);
+        Assertions.assertEquals(c2.getPosts().get(0), p2);
+
+        Assertions.assertEquals(p1, postService.findPost(p1.getId()));
+        Assertions.assertEquals(p2, postService.findPost(p2.getId()));
+
+        Post p3 = postService.addPost(c1, "asdf", "asd");
+        postService.deletePost(p1.getId());
+        Assertions.assertEquals(1, customerService.findCustomer(c1.getId()).getPosts().size());
+
+        Post p4 = postService.updatePost(p2.getId(), "third title", "wow");
+
+        Assertions.assertNotEquals(p2.getTitle(), p4.getTitle());
+        Assertions.assertNotEquals(p2.getContent(), p4.getContent());
+
+        commentService.deleteAllComment();
+        postService.deleteAllPosts();
+        customerService.deleteAllCustomers();
+    }
+
+    @Test
+    void testComment() {
+        commentService.deleteAllComment();
+        postService.deleteAllPosts();
+        customerService.deleteAllCustomers();
+
+        Customer c1 = customerService.addCustomer("first", "1");
+        Customer c2 = customerService.addCustomer("second", "2");
+
+        Post p1 = postService.addPost(c1, "first title", "nonsense");
+        Post p2 = postService.addPost(c2, "second title", "ordinal");
+
+        Assertions.assertEquals(2, postService.findAllPosts().size());
+
+        Comment com1 = commentService.addComment(c1, p2, "What");
+        Comment com2 = commentService.addComment(c2, p1, "How");
+
+        Assertions.assertEquals(c1, p2.getComments().get(0).getCustomer());
+        Assertions.assertEquals(c2, p1.getComments().get(0).getCustomer());
+
+        Comment com3 = commentService.addComment(c1, p1, "Really");
+
+        Assertions.assertEquals(com2, commentService.findComment(p1.getComments().get(0).getId()));
+
+        Comment com4 = commentService.updateComment(com3.getId(), "Not really");
+
+        Assertions.assertNotEquals(com3.getContent(), com4.getContent());
+        Assertions.assertEquals(com3.getCustomer().getId(), com4.getCustomer().getId());
+
+        commentService.deleteAllComment();
+        postService.deleteAllPosts();
+        customerService.deleteAllCustomers();
+    }
+}

src/test/resources/application.properties

@@ -0,0 +1,6 @@
+spring.datasource.url=jdbc:h2:mem:testdb
+spring.datasource.driverClassName=org.h2.Driver
+spring.datasource.username=sa
+spring.datasource.password=password
+spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
+spring.jpa.hibernate.ddl-auto=create-drop