BAEL-7898 - Inject mocks and autowired (eugenp#16514)

* BAEL-7646 - converting json node to java collections

* BAEL-7646 - changing test method names

* BAEL-7898 - removing print statements

testing-modules/spring-mockito/src/main/java/com/baeldung/injectmocks/Book.java

@@ -0,0 +1,25 @@
+package com.baeldung.injectmocks;
+
+public class Book {
+    private String id;
+    private String name;
+    private String author;
+
+    public Book(String id, String name, String author) {
+        this.id = id;
+        this.name = name;
+        this.author = author;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+}

testing-modules/spring-mockito/src/main/java/com/baeldung/injectmocks/BookService.java

@@ -0,0 +1,23 @@
+package com.baeldung.injectmocks;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.springframework.stereotype.Service;
+
+@Service
+public class BookService {
+
+    private DatabaseService databaseService;
+    private ObjectMapper objectMapper;
+
+    BookService(DatabaseService databaseService, ObjectMapper objectMapper) {
+        this.databaseService = databaseService;
+        this.objectMapper = objectMapper;
+    }
+
+    String getBook(String id) throws JsonProcessingException {
+        Book book = databaseService.findById(id);
+        return objectMapper.writeValueAsString(book);
+    }
+
+}

testing-modules/spring-mockito/src/main/java/com/baeldung/injectmocks/DatabaseService.java

@@ -0,0 +1,12 @@
+package com.baeldung.injectmocks;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class DatabaseService {
+
+    public Book findById(String id) {
+        // querying a Database and getting a book
+        return new Book("id", "Name", "Author");
+    }
+}

testing-modules/spring-mockito/src/main/java/com/baeldung/injectmocks/InjectMocksApplication.java

@@ -0,0 +1,11 @@
+package com.baeldung.injectmocks;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class InjectMocksApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(InjectMocksApplication.class, args);
+    }
+}

testing-modules/spring-mockito/src/test/java/com/baeldung/injectmocks/BookServiceAutowiredAndInjectMocksUnitTest.java

@@ -0,0 +1,35 @@
+package com.baeldung.injectmocks;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.when;
+
+@SpringBootTest
+class BookServiceAutowiredAndInjectMocksUnitTest {
+
+    @Mock
+    private DatabaseService databaseService;
+
+    @Autowired
+    @InjectMocks
+    private BookService bookService;
+
+    @Test
+    void givenBookService_whenGettingBook_thenBookIsCorrect() throws JsonProcessingException {
+        Book book1 = new Book("1234", "Inferno", "Dan Brown");
+
+        MockitoAnnotations.openMocks(this);
+
+        when(databaseService.findById(eq("1234"))).thenReturn(book1);
+        String bookString1 = bookService.getBook("1234");
+        Assertions.assertTrue(bookString1.contains("Dan Brown"));
+    }
+}

testing-modules/spring-mockito/src/test/java/com/baeldung/injectmocks/BookServiceMockAndInjectMocksUnitTest.java

@@ -0,0 +1,38 @@
+package com.baeldung.injectmocks;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.when;
+
+@SpringBootTest
+class BookServiceMockAndInjectMocksUnitTest {
+
+    @Mock
+    private DatabaseService databaseService;
+
+    @Mock
+    private ObjectMapper objectMapper;
+
+    @InjectMocks
+    private BookService bookService;
+
+    @Test
+    void givenBookService_whenGettingBook_thenBookIsCorrect() throws JsonProcessingException {
+        Book book1 = new Book("1234", "Inferno", "Dan Brown");
+        when(databaseService.findById(eq("1234"))).thenReturn(book1);
+
+        when(objectMapper.writeValueAsString(any())).thenReturn(new ObjectMapper().writeValueAsString(book1));
+
+        String bookString1 = bookService.getBook("1234");
+        Assertions.assertTrue(bookString1.contains("Dan Brown"));
+    }
+
+}

testing-modules/spring-mockito/src/test/java/com/baeldung/injectmocks/BookServiceMockBeanAndAutowiredUnitTest.java

@@ -0,0 +1,30 @@
+package com.baeldung.injectmocks;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+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;
+import org.springframework.boot.test.mock.mockito.MockBean;
+
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.when;
+
+@SpringBootTest
+class BookServiceMockBeanAndAutowiredUnitTest {
+
+    @MockBean
+    private DatabaseService databaseService;
+    @Autowired
+    private BookService bookService;
+
+    @Test
+    void givenBookService_whenGettingBook_thenBookIsCorrect() throws JsonProcessingException {
+        Book book1 = new Book("1234", "Inferno", "Dan Brown");
+        when(databaseService.findById(eq("1234"))).thenReturn(book1);
+
+        String bookString1 = bookService.getBook("1234");
+        Assertions.assertTrue(bookString1.contains("Dan Brown"));
+    }
+
+}