Spring Boot - 單元測試用例

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單元測試是由開發人員進行的一種測試，以確保各個單元或元件的功能正常工作。

在本教程中，我們將學習如何使用 Mockito 和 Web Controller 編寫單元測試用例。

Mockito

為了將 Mockito 模擬物件注入 Spring Bean，我們需要在構建配置檔案中新增 Mockito-core 依賴項。

本章將介紹如何在 Spring Boot 應用程式中使用 Mockito。

首先，從 Spring Initializer 頁面下載 Spring Boot 專案 www.start.spring.io。

Creating Mockito Project

Maven 使用者可以在 pom.xml 檔案中新增以下依賴項。

<dependency>
   <groupId>org.mockito</groupId>
   <artifactId>mockito-core</artifactId>
</dependency>

Gradle 使用者可以在 build.gradle 檔案中新增以下依賴項。

compile group: 'org.mockito', name: 'mockito-core', version: '5.13.0'
testCompile('org.springframework.boot:spring-boot-starter-test')

這裡給出了一個包含返回字串值的 Service 類方法的程式碼。

ProductService.java

package com.tutorialspoint.mockito;

import org.springframework.stereotype.Service;

@Service
public class ProductService {
   public String getProductName() {
      return "Honey";
   } 
}

現在，將 ProductService 類注入另一個 Service 類檔案，如下所示。

OrderService.java

package com.tutorialspoint.mockito;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class OrderService {
   @Autowired
   ProductService productService;

   public OrderService(ProductService productService) {
      this.productService = productService;
   }
   public String getProductName() {
      return productService.getProductName();
   }
}

主要的 Spring Boot 應用程式類檔案如下所示：

MockitoApplication.java

package com.tutorialspoint.mockitodemo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MockitoApplication {
   public static void main(String[] args) {
      SpringApplication.run(MockitoApplication.class, args);
   }
}

然後，為測試配置 Application 上下文。@Profile("test") 註解用於在執行測試用例時配置類。

ProductServiceTestConfiguration.java

package com.tutorialspoint.mockito;

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")
@Configuration
public class ProductServiceTestConfiguration {
   @Bean
   @Primary
   ProductService productService() {
      return Mockito.mock(ProductService.class);
   }
}

現在，您可以為 Order Service 編寫單元測試用例，位於 src/test/java 包下。

MockitoApplicationTests.java

package com.tutorialspoint.mockito;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mockito;
import org.mockito.junit.jupiter.MockitoExtension;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.ActiveProfiles;

@SpringBootTest
@ActiveProfiles("test")
@ExtendWith(MockitoExtension.class)
public class MockitoApplicationTests {
   @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();
      assertEquals("Mock Product Name", testName);
   }
}

完整的構建配置檔案程式碼如下所示。

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>3.3.4</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.tutorialspoint</groupId>
   <artifactId>mockito</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>mockito</name>
   <description>Demo project for Spring Boot</description>
   <url/>
   <licenses>
      <license/>
   </licenses>
   <developers>
      <developer/>
   </developers>
   <scm>
      <connection/>
      <developerConnection/>
      <tag/>
      <url/>
   </scm>
   <properties>
      <java.version>21</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>
      </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 = '3.3.4'
   }
   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.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 21

repositories {
   mavenCentral()
}
dependencies {
   compile('org.springframework.boot:spring-boot-starter')
   compile group: 'org.mockito', name: 'mockito-core', version: '5.13.0'
   testCompile('org.springframework.boot:spring-boot-starter-test')
}

編譯和執行

您可以建立一個可執行的 JAR 檔案，並使用以下 Maven 或 Gradle 命令執行 Spring Boot 應用程式。

對於 Maven，您可以使用如下所示的命令：

mvn clean install

您可以在控制檯視窗中看到測試結果。

[INFO] Scanning for projects...
[INFO] 
[INFO] [1m---------------------< [0;36mcom.tutorialspoint:mockito[0;1m >---------------------[m
[INFO] [1mBuilding mockito 0.0.1-SNAPSHOT[m
[INFO]   from pom.xml
[INFO] [1m--------------------------------[ jar ]---------------------------------[m
[INFO] 
[INFO] [1m--- [0;32mresources:3.3.1:resources[m [1m(default-resources)[m @ [36mmockito[0;1m ---[m
[INFO] Copying 1 resource from src\main\resources to target\classes
[INFO] Copying 0 resource from src\main\resources to target\classes
[INFO] 
[INFO] [1m--- [0;32mcompiler:3.13.0:compile[m [1m(default-compile)[m @ [36mmockito[0;1m ---[m
[INFO] Nothing to compile - all classes are up to date.
[INFO] 
[INFO] [1m--- [0;32mresources:3.3.1:testResources[m [1m(default-testResources)[m @ [36mmockito[0;1m ---[m
[INFO] skip non existing resourceDirectory E:\Dev\mockito\src\test\resources
[INFO] 
[INFO] [1m--- [0;32mcompiler:3.13.0:testCompile[m [1m(default-testCompile)[m @ [36mmockito[0;1m ---[m
[INFO] Nothing to compile - all classes are up to date.
[INFO] 
[INFO] [1m--- [0;32msurefire:3.2.5:test[m [1m(default-test)[m @ [36mmockito[0;1m ---[m
[INFO] Using auto detected provider org.apache.maven.surefire.junitplatform.JUnitPlatformProvider
[INFO] 
[INFO] -------------------------------------------------------
[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO] Running com.tutorialspoint.mockito.[1mMockitoApplicationTests[m
12:01:28.057 [main] INFO org.springframework.test.context.support.AnnotationConfigContextLoaderUtils -- Could not detect default configuration classes for test class [com.tutorialspoint.mockito.MockitoApplicationTests]: MockitoApplicationTests does not declare any static, non-private, non-final, nested classes annotated with @Configuration.
12:01:28.190 [main] INFO org.springframework.boot.test.context.SpringBootTestContextBootstrapper -- Found @SpringBootConfiguration com.tutorialspoint.mockito.MockitoApplication for test class com.tutorialspoint.mockito.MockitoApplicationTests

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/

 :: Spring Boot ::                (v3.3.4)

2024-09-25T12:01:28.643+05:30  INFO 11396 --- [mockito] [           main] c.t.mockito.MockitoApplicationTests      : Starting MockitoApplicationTests using Java 21.0.3 with PID 11396 (started by Tutorialspoint in E:\Dev\mockito)
2024-09-25T12:01:28.645+05:30  INFO 11396 --- [mockito] [           main] c.t.mockito.MockitoApplicationTests      : The following 1 profile is active: "test"
WARNING: A Java agent has been loaded dynamically (C:\Users\Tutorialspoint\.m2\repository\net\bytebuddy\byte-buddy-agent\1.14.19\byte-buddy-agent-1.14.19.jar)
WARNING: If a serviceability tool is in use, please run with -XX:+EnableDynamicAgentLoading to hide this warning
WARNING: If a serviceability tool is not in use, please run with -Djdk.instrument.traceUsage for more information
WARNING: Dynamic loading of agents will be disallowed by default in a future release
2024-09-25T12:01:30.331+05:30  INFO 11396 --- [mockito] [           main] c.t.mockito.MockitoApplicationTests      : Started MockitoApplicationTests in 1.984 seconds (process running for 3.181)
[INFO] [1;32mTests run: [0;1;32m1[m, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.640 s -- in com.tutorialspoint.mockito.[1mMockitoApplicationTests[m
[INFO] 
[INFO] Results:
[INFO] 
[INFO] [1;32mTests run: 1, Failures: 0, Errors: 0, Skipped: 0[m
[INFO] 
[INFO] 
[INFO] [1m--- [0;32mjar:3.4.2:jar[m [1m(default-jar)[m @ [36mmockito[0;1m ---[m
[INFO] Building jar: E:\Dev\mockito\target\mockito-0.0.1-SNAPSHOT.jar
[INFO] 
[INFO] [1m--- [0;32mspring-boot:3.3.4:repackage[m [1m(repackage)[m @ [36mmockito[0;1m ---[m
[INFO] Replacing main artifact E:\Dev\mockito\target\mockito-0.0.1-SNAPSHOT.jar with repackaged archive, adding nested dependencies in BOOT-INF/.
[INFO] The original artifact has been renamed to E:\Dev\mockito\target\mockito-0.0.1-SNAPSHOT.jar.original
[INFO] 
[INFO] [1m--- [0;32minstall:3.1.3:install[m [1m(default-install)[m @ [36mmockito[0;1m ---[m
[INFO] Installing E:\Dev\mockito\pom.xml to C:\Users\Tutorialspoint\.m2\repository\com\tutorialspoint\mockito\0.0.1-SNAPSHOT\mockito-0.0.1-SNAPSHOT.pom
[INFO] Installing E:\Dev\mockito\target\mockito-0.0.1-SNAPSHOT.jar to C:\Users\Tutorialspoint\.m2\repository\com\tutorialspoint\mockito\0.0.1-SNAPSHOT\mockito-0.0.1-SNAPSHOT.jar
[INFO] [1m------------------------------------------------------------------------[m
[INFO] [1;32mBUILD SUCCESS[m
[INFO] [1m------------------------------------------------------------------------[m
[INFO] Total time:  6.370 s
[INFO] Finished at: 2024-09-25T12:01:31+05:30
[INFO] [1m------------------------------------------------------------------------[m

對於 Gradle，您可以使用如下所示的命令：

gradle clean build
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