在Eclipse中因為版本問題，可能無法使用@parameters(name = "xxx")，詳見解決辦法(文章的最後部分： IDE Bug - Eclipse)：

 https://github.com/junit-team/junit/wiki/Parameterized-tests

1. MathUtils – 參數化測試

查看一個簡單的 add 方法。

MathUtils.java

package com.yiibai.match.utils;

public class MathUtils {

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

}

這裡有一個為上麵的JUnit測試類，閱讀不言自明的注釋。

MathUtilsTest.java

package com.yiibai.match.utils;

import static org.junit.Assert.assertEquals;
import java.util.Arrays;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

@RunWith(value = Parameterized.class)
public class MathUtilsTest {

	private int numberA;
	private int numberB;
	private int expected;

	//parameters pass via this constructor
	public MathUtilsTest(int numberA, int numberB, int expected) {
		this.numberA = numberA;
		this.numberB = numberB;
		this.expected = expected;
	}

	//Declares parameters here
	@Parameters(name = "{index}: add({0}+{1})={2}")
	public static Iterable<Object[]> data1() {
		return Arrays.asList(new Object[][] { 
			{ 1, 1, 2 }, 
			{ 2, 2, 4 }, 
			{ 8, 2, 10 }, 
			{ 4, 5, 9 } 
		});
	}

	@Test
	public void test_add() {	
		assertEquals(expected,MathUtils.add(numberA, numberB));
	}

}

什麼是 {0}, {1} 和 {2}?
如果參數是 “{ 3, 4, 7 }”, 那麼 {0} = 3, {1} = 4, {2} = 7. 請參考以下的輸出：

2. DomainUtils – 參數化測試

查看域名驗證程序。

DomainUtils.java

package com.yiibai.regex.utils;

import java.util.regex.Pattern;

public class DomainUtils {

	private static Pattern pDomainName;

	private static final String DOMAIN_NAME_PATTERN = "^((?!-)[A-Za-z0-9-]{1,63}(?<!-)\\.)+[A-Za-z]{2,6}$";

	static {
		pDomainName = Pattern.compile(DOMAIN_NAME_PATTERN);
	}

	//is this a valid domain name?
	public static boolean isValidDomainName(String domainName) {
		return pDomainName.matcher(domainName).find();
	}

}

這裡有一個 JUnit 測試上麵的類。

DomainUtilsTest.java

package com.yiibai.regex.utils;

import static org.junit.Assert.assertEquals;
import java.util.Arrays;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

@RunWith(value = Parameterized.class)
public class DomainUtilsTest {

	private String domain;
	private boolean expected;

	public DomainUtilsTest(String domain, boolean expected) {
		this.domain = domain;
		this.expected = expected;
	}

	@Parameters(name= "{index}: isValid({0})={1}")
 	public static Iterable<Object[]> data() {
 		return Arrays.asList(new Object[][] { 
 		{ "google.com", true },
		{ "gitbook.net", true },
                { "-gitbook.net", false },
                { "yiibai-.com", false },
                { "3423kjk", false },
                { "mk#$kdo.com", false }
            }
 	);
     }

	@Test
	public void test_validDomains() {
		assertEquals(expected,DomainUtils.isValidDomainName(domain));
	}

}

輸出結果：

完成