【JUnit】JUnit 参数化测试

环境

• JDK 6
• JUnit 4.13
• Spring Tool Suite 4.6.2
• Maven 3.6.3

参数化测试

参数化测试首先需要指定 Runner：org.junit.runners.Parameterized，然后准备测试数据。
有两种注入测试数据的方法，一种是构造函数注入，另一种是字段注入，字段注入必须是 public。

参数化测试

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>jiangbo.java.junit</groupId>
    <artifactId>15-java-junit-parameterized</artifactId>
    <version>1.0.0</version>
    <description>JUnit 参数化测试示例</description>

    <properties>
        <maven.compiler.source>1.6</maven.compiler.source>
        <maven.compiler.target>1.6</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>

    </dependencies>

</project>

CaculatorTest1

package jiangbo.java.junit;

import static org.junit.Assert.assertEquals;

import java.util.Arrays;
import java.util.Collection;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class CaculatorTest1 {

    private int number1;

    private int number2;

    private int addExpected;

    public CaculatorTest1(int number1, int number2, int addExpected) {

        this.number1 = number1;
        this.number2 = number2;
        this.addExpected = addExpected;
    }

    @Test
    public void testAdd() {

        int actual = Caculator.add(number1, number2);
        assertEquals(addExpected, actual);
    }

    // 指定了测试的名称
    @Parameters(name = "第 {index} 个: {0} + {1} = {2}")
    public static Collection<Object[]> data() {

        return Arrays.asList(new Object[][] {
                { 0, 0, 0 },
                { 1, 1, 2 },
                { 2, 1, 3 },
                { -1, 0, -1 },
                { 0, -1, -1 },
                { 1, -1, 0 },
                { -1, 1, 0 }
        });
    }
}

CaculatorTest2

package jiangbo.java.junit;

import static org.junit.Assert.assertEquals;

import java.util.Arrays;
import java.util.Collection;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameter;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class CaculatorTest2 {

    // 默认 0
    @Parameter
    public int number1;

    @Parameter(1)
    public int number2;

    @Parameter(2)
    public int addExpected;

    @Parameter(3)
    public int subtractExpected;

    @Test
    public void testAdd() {

        int actual = Caculator.add(number1, number2);
        assertEquals(addExpected, actual);
    }

    @Test
    public void testSubtract() throws Exception {

        int actual = Caculator.subtract(number1, number2);
        assertEquals(subtractExpected, actual);
    }

    @Parameters
    public static Collection<Object[]> data() {

        return Arrays.asList(new Object[][] {
                { 0, 0, 0, 0 },
                { 1, 1, 2, 0 },
                { 2, 1, 3, 1 },
                { -1, 0, -1, -1 },
                { 0, -1, -1, 1 },
                { 1, -1, 0, 2 },
                { -1, 1, 0, -2 }
        });
    }
}

CaculatorTest1 输出