maven+jacoco java 代碼測試覆蓋率

maven工程

pom.xml

<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.jacoco.tutorial</groupId>
	<artifactId>jacoco-demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>
	</dependencies>
	<build>
		<plugins>

			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-surefire-plugin</artifactId>
				<configuration>
					<testFailureIgnore>true</testFailureIgnore>
					<!-- 限定跑哪些測試類 -->
					<includes>
					<!-- "**/Test*.java" - includes all of its subdirectories and all Java filenames that start with "Test". -->
					<!-- "**/*Test.java" - includes all of its subdirectories and all Java filenames that end with "Test". -->
						<include>**/*Test.java</include>
						<!-- 支持正則 http://maven.apache.org/surefire/maven-surefire-plugin/examples/inclusion-exclusion.html-->
						<!-- <include>%regex[.*(Cat|Dog).*Test.*]</include> -->
					</includes>
				</configuration>
			</plugin>

			<plugin>
				<groupId>org.jacoco</groupId>
				<artifactId>jacoco-maven-plugin</artifactId>
				<version>0.8.1</version>
				<configuration>
					<includes>
					<!-- 限定只統計部分類的覆蓋率 -->
						<include>com/jacoco/tutorial/Calculator*</include>
					</includes>
					<destFile>${project.build.directory}/coverage-reports/jacoco-unit.exec</destFile>
					<dataFile>${project.build.directory}/coverage-reports/jacoco-unit.exec</dataFile>
				</configuration>
				<executions>
					<execution>
						<id>jacoco-initialize</id>
						<goals>
							<goal>prepare-agent</goal>
						</goals>
					</execution>
					<execution>
						<id>jacoco-site</id>
						<phase>test</phase>
						<goals>
							<goal>report</goal>
						</goals>
					</execution>
				</executions>
			</plugin>


		</plugins>
	</build>

</project>

說明：
1.如果不限制跑哪些測試用例，其中的 <artifactId>maven-surefire-plugin</artifactId>的<plugin>可以註釋掉。

2.<!-- 限定跑哪些測試類 -->的<includes>可以刪除。

 

java代碼

package com.jacoco.tutorial;

public class Calculator {
 
	public int add(int a, int b) {
		return a + b;
	}
 
	public int sub(int a, int b) {
		return a - b;
	}
}

 

package com.jacoco.tutorial;
 
import org.junit.Assert;
import org.junit.Test;
 
public class CalculatorTest {
 
	private Calculator instance = new Calculator();
 
	@Test
	public void testAdd() {
		int a = 10;
		int b = 20;
		int expected = 30;
		Assert.assertEquals(expected, instance.add(a, b));
	}
 
	@Test
	public void testSub() {
		int a = 10;
		int b = 20;
		int expected = -10;
		Assert.assertEquals(expected, instance.sub(a, b));
	}
}

生成覆蓋率報告：
    run as>mvn test
報告首頁位置：
    默認在 
    \target\site\jacoco\index.html

結果

可以通過outputDirectory（具體位置參考如下）修改下默認位置：

			<plugin>
				<artifactId>jacoco-maven-plugin</artifactId>
				<executions>
						<configuration>
							<outputDirectory>target/jacoco-ut</outputDirectory>
						</configuration>
					</execution>
				</executions>
			</plugin>

 

生成測試用例的測試報告，在pom.xml所在的目錄執行：
    mvn test surefire-report:report
位置在：
    /target/site/surefire-report.html

結果：

 

更專業的文章：

http://www.51testing.com/html/11/n-3726211.html

提到 實時插樁模式(on-the-fly)、離線插樁(offline instrumentation) ，jacoco應該可以實現實時監控測試人員人工測試後的覆蓋率。