Maven工程加入Jacoo生成代码测试覆盖率报告

完整代码Github地址： https://github.com/mgljava/jacoco-demo

Maven：Apache Maven是一个软件项目管理和理解工具。Maven基于项目对象模型(POM)的概念，可以从中心信息管理项目的构建、报告和文档

Jacoco：Java Code Coverage Library

1.创建Maven工程--》不多说。我用的是Intellij IDEA IDE

2.配置maven-compiler-plugin

<plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.6.1</version>
        <configuration>
          <skipMain>true</skipMain>
          <skip>true</skip>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
</plugin>

3.配置Jacoco-maven-plugins

<plugin>
        <groupId>org.jacoco</groupId>
        <artifactId>jacoco-maven-plugin</artifactId>
        <version>${jacoco.version}</version>
        <executions>
          <execution>
            <id>prepare-agent</id>
            <goals>
              <goal>prepare-agent</goal>
            </goals>
          </execution>
          <execution>
            <id>report</id>
            <phase>prepare-package</phase>
            <goals>
              <goal>report</goal>
            </goals>
          </execution>
          <execution>
            <id>post-unit-test</id>
            <phase>test</phase>
            <goals>
              <goal>report</goal>
            </goals>
            <configuration>
              <dataFile>target/jacoco.exec</dataFile>
              <outputDirectory>target/jacoco-report</outputDirectory>
            </configuration>
          </execution>
        </executions>
        <configuration>
          <systemPropertyVariables>
            <jacoco-agent.destfile>target/jacoco.exec</jacoco-agent.destfile>
          </systemPropertyVariables>
        </configuration>
</plugin>

4.编写业务代码，这里用作举例，就弄一个简单的计算类

package com.github.mgljava.calc;

public class Calculator {

  public int add(int a, int b) {
    return a + b;
  }

  public int sub(int a, int b) {
    return a - b;
  }

  public int multi(int a, int b) {
    return a * b;
  }

  public int div(int a, int b) {
    return a / b;
  }

  public int switchCase(int a) {
    switch (a) {
      case 1:
        return 1;
      case 2:
        return 2;
      case 3:
        return 3;
      default:
        return 4;
    }
  }
}

5.编写测试类

package com.github.mgljava.calc;

import static org.junit.Assert.assertEquals;

import org.junit.Test;

public class CalculatorTest {

  private Calculator calculator = new Calculator();

  @Test
  public void should_get_30_when_a_equal_20_and_b_equal_10() {
    // given
    int a = 10;
    int b = 20;

    // when
    final int addNumber = calculator.add(a, b);

    // then
    assertEquals(30, addNumber);
  }

  @Test
  public void should_get_18_when_a_equal_20_and_b_equal_2() {
    // given
    int a = 20;
    int b = 2;

    // when
    final int subNumber = calculator.sub(a, b);

    // then
    assertEquals(18, subNumber);
  }

  @Test
  public void should_get_6_when_a_equal_3_and_b_equal_2() {
    // given
    int a = 3;
    int b = 2;

    // when
    final int multiResult = calculator.multi(a, b);

    // then
    assertEquals(6, multiResult);
  }

  @Test
  public void should_get_5_when_a_equal_10_and_b_equal_2() {
    // given
    int a = 10;
    int b = 2;

    // when
    final int divResult = calculator.div(a, b);

    // then
    assertEquals(5, divResult);
  }

  @Test
  public void should_get_1_when_arg_is_1() {
    // given
    int a = 1;

    // when
    final int result = calculator.switchCase(a);

    // then
    assertEquals(1, result);
  }

  @Test
  public void should_get_2_when_arg_is_2() {
    // given
    int a = 2;

    // when
    final int result = calculator.switchCase(a);

    // then
    assertEquals(2, result);
  }

  @Test
  public void should_get_3_when_arg_is_3() {
    // given
    int a = 3;

    // when
    final int result = calculator.switchCase(a);

    // then
    assertEquals(3, result);
  }

  @Test
  public void should_get_4_when_arg_is_4() {
    // given
    int a = 4;

    // when
    final int result = calculator.switchCase(a);

    // then
    assertEquals(4, result);
  }
}

6.运行命令：mvn test ，可以在下图中看到生成的测试报告目录

7.可以在浏览器中看到测试报告：