Creating parameterized tests with JUnit4

环境

hamcrest-all-1.3

junit-4.13.2

被测类

package com.yaya.junit;

public class Factorial {

    public long factorial(long number) {
        if(number == 0) {
            return 1;
        }

        return number*factorial(number-1);
    }
}

测试类一：使用构造函数

package com.yaya.junit;

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;

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

import static org.junit.Assert.assertEquals;

@RunWith(Parameterized.class)
public class ParameterizedFactorialTest {


    private int number;
    private int expectedResult;

    public ParameterizedFactorialTest(int input, int expected) {
        number= input;
        expectedResult= expected;
    }

    @Parameters
    public static Collection factorialData() {
        return Arrays.asList(new Object[][] {
                { 0, 1 }, { 1, 1 }, { 2, 2 }, { 3, 6 }, { 4, 24 }, { 5, 120 },{ 6, 720 }
        });
    }

    @Test
    public void factorial() throws Exception {
        Factorial fact = new Factorial();
        assertEquals(fact.factorial(number),expectedResult);
    }
}

测试类二：使用公有变量

package com.yaya.junit;

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;

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

import static org.junit.Assert.assertEquals;

@RunWith(Parameterized.class)
public class ParameterizedFactorialTest {

    @Parameter(value=0)
    public int number;
    @Parameter(value=1)
    public int expectedResult;


    @Parameters
    public static Collection factorialData() {
        return Arrays.asList(new Object[][] {
                { 0, 1 }, { 1, 1 }, { 2, 2 }, { 3, 6 }, { 4, 24 }, { 5, 120 },{ 6, 720 }
        });
    }

    @Test
    public void factorial() throws Exception {
        Factorial fact = new Factorial();
        assertEquals(fact.factorial(number),expectedResult);
    }
}

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