单元测试系列[v1.0.0][Junit5]

原创

Davieyang 2022-01-11 10:12:48 ©著作权

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被测应用

像素密度计算器，用于当用户输入屏幕的宽度、高度和尺寸后，计算像素密度

public class CalculatorForPpi {
    public static long calculate(int width, int height, double size){
        long result;
        if (width > 0 && height > 0 && size>0){
           result = Math.round(Math.pow((Math.pow(width, 2) + Math.pow(height, 2)) / Math.pow(size, 2), 0.5));
        }else {
            result = -1;
        }
        return result;
    }
}

入参分析

width为屏幕宽度，height为屏幕高度，都属于int型；size为屏幕尺寸属于double型，返回像素密度为long型；如果宽度、高度、屏幕尺寸任意一个小于或等于0则返回-1，如果大于0则正常计算，计算公式为宽的平方加上高的平方：PPI= 宽 2 + 高 2 / 尺寸 \sqrt{\def\foo{宽^2+高^2} \foo}/尺寸宽2+高2 /尺寸

参数设置

Case1: width=750 height=1334 size=4.7 计算像素密度
Case1: width=-1 height=1334 size=4.7 不计算像素密度
Case1: width=0 height=1334 size=4.7 不计算像素密度
Case1: width=750 height=-1 size=4.7 不计算像素密度
Case1: width=750 height=0 size=4.7 不计算像素密度
Case1: width=750 height=1334 size=-1 不计算像素密度
Case1: width=750 height=1334 size=0 不计算像素密度

POM配置

<!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api -->
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>5.6.2</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-params -->
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-params</artifactId>
            <version>5.6.2</version>
            <scope>test</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-engine -->
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
            <version>5.6.2</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.junit.platform/junit-platform-launcher -->
        <dependency>
            <groupId>org.junit.platform</groupId>
            <artifactId>junit-platform-launcher</artifactId>
            <version>1.6.2</version>
            <scope>test</scope>
        </dependency>

测试用例

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;

public class CalculatorForPpiTest {
    private static int height;
    private static int width;
    private static double size;


    @BeforeAll
    static void init(){
        width = 750;
        height = 1334;
        size = 4.7;
    }

    @Test
    void testCase1(){
        Assertions.assertEquals(326, CalculatorForPpi.calculate(width, height, size));
    }

    @Test
    void testCase2(){
        Assertions.assertEquals(-1, CalculatorForPpi.calculate(-1, height, size));
    }

    @Test
    void testCase3(){
        Assertions.assertEquals(326, CalculatorForPpi.calculate(0, height, size));
    }

    @Test
    void testCase4(){
        Assertions.assertEquals(326, CalculatorForPpi.calculate(width, -1, size));
    }

    @Test
    void testCase5(){
        Assertions.assertEquals(326, CalculatorForPpi.calculate(width, 0, size));
    }

    @Test
    void testCase6(){
        Assertions.assertEquals(326, CalculatorForPpi.calculate(width, height, -1));
    }

    @Test
    void testCase7(){
        Assertions.assertEquals(326, CalculatorForPpi.calculate(width, height, 0));
    }
}