<dependency> <groupId>org.mockito</groupId> <artifactId>mockito-core</artifactId> <version>2.13.0</version></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope></dependency>

Gradle users can add the following dependency in the build.gradle file.

compile group: ‘org.mockito’, name: ‘mockito-core’, version: ‘2.13.0’testCompile(‘org.springframework.boot:spring-boot-starter-test’)

The code to write a Service class which contains a method that returns the String value is given here.

package com.tecklearn.mockitodemo; import org.springframework.stereotype.Service; @Servicepublic class ProductService { public String getProductName() { return “Honey”; } }

Now, inject the ProductService class into another Service class file as shown.

package com.tecklearn.mockitodemo; import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service; @Servicepublic class OrderService { @Autowired ProductService productService; public OrderService(ProductService productService) { this.productService = productService; } public String getProductName() { return productService.getProductName(); }}

The main Spring Boot application class file is given below −

package com.tecklearn.mockitodemo; import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplicationpublic class MockitoDemoApplication { public static void main(String[] args) { SpringApplication.run(MockitoDemoApplication.class, args); }}

Then, configure the Application context for the tests. The @Profile(“test”) annotation is used to configure the class when the Test cases are running.

package com.tecklearn.mockitodemo; import org.mockito.Mockito;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Primary;import org.springframework.context.annotation.Profile; @Profile(“test”)@Configurationpublic class ProductServiceTestConfiguration { @Bean @Primary public ProductService productService() { return Mockito.mock(ProductService.class); }}

Now, you can write a Unit Test case for Order Service under the src/test/resources package.

package com.tecklearn.mockitodemo; import org.junit.Assert;import org.junit.Test;import org.junit.runner.RunWith;import org.mockito.Mockito;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.ActiveProfiles;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; @SpringBootTest@ActiveProfiles(“test”)@RunWith(SpringJUnit4ClassRunner.class)public class MockitoDemoApplicationTests { @Autowired private OrderService orderService; @Autowired private ProductService productService; @Test public void whenUserIdIsProvided_thenRetrievedNameIsCorrect() { Mockito.when(productService.getProductName()).thenReturn(“Mock Product Name”); String testName = orderService.getProductName(); Assert.assertEquals(“Mock Product Name”, testName); }}

The complete code for build configuration file is given below.

Maven – pom.xml

<?xml version = “1.0” encoding = “UTF-8”?><project xmlns = “http://maven.apache.org/POM/4.0.0” xmlns:xsi = “http://www.w3.org/2001/XMLSchema-instance” xsi:schemaLocation = “http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd”> <modelVersion>4.0.0</modelVersion> <groupId>com.tecklearn</groupId> <artifactId>mockito-demo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>mockito-demo</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.9.RELEASE</version> <relativePath /> <!– lookup parent from repository –> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.mockito</groupId> <artifactId>mockito-core</artifactId> <version>2.13.0</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>

Gradle – build.gradle

buildscript { ext { springBootVersion = ‘1.5.9.RELEASE’ } repositories { mavenCentral() } dependencies { classpath(“org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}”) }} apply plugin: ‘java’apply plugin: ‘eclipse’apply plugin: ‘org.springframework.boot’ group = ‘com.tecklearn’version = ‘0.0.1-SNAPSHOT’sourceCompatibility = 1.8 repositories { mavenCentral()}dependencies { compile(‘org.springframework.boot:spring-boot-starter’) compile group: ‘org.mockito’, name: ‘mockito-core’, version: ‘2.13.0’ testCompile(‘org.springframework.boot:spring-boot-starter-test’)}

You can create an executable JAR file, and run the Spring Boot application by using the following Maven or Gradle1 commands.

For Maven, you can use the command as shown −

mvn clean install

You can see the test results in console window.

For Gradle, you can use the command as shown −

gradle clean build

You can see the rest results in console window.

So, this brings us to the end of blog. This Tecklearn ‘How to write a unit test case by using Mockito and Web Controller’ blog helps you with commonly asked questions if you are looking out for a job in Java Programming. If you wish to learn Spring Boot and build a career Java Programming domain, then check out our interactive, Java and JEE Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

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