Posted on 2007-07-14 19:21
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原文地址:http://www.ibm.com/developerworks/java/library/j-cq08296/?ca=dgr-lnxw07JUnit4vsTestNG
JUnit到了4.0以后,增加了许多新特性,变得更加灵活易用。但是另一个也是基于Annotations的TestNG在灵活易用方面已经走在了JUnit的前面。实际上,TestNG是基于Annotation的测试框架的先驱,那么这两者之间的差别是什么呢,在这里,将对两者进行一些简单的比较。
首先两者在外观上看起来是非常相似的。使用起来都非常的简便。但是从核心设计的出发点来说,两者是不一样的。JUnit一直将自己定位于单元测试框架,也就是说用于测试单个对象。而TestNG定位于更高层次的测试,因此具备了一些JUnit所没有的功能。
A simple test case
At first glance, tests implemented in JUnit 4 and TestNG look remarkably similar. To see what I mean, take a look at the code in Listing 1, a JUnit 4 test that has a macro-fixture (a fixture that is called just once before any tests are run), which is denoted by the @BeforeClass
attribute:
先来看一个简单的测试例子:
第一眼看上去,JUnit和TestNG几乎一模一样。
package test.com.acme.dona.dep;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import org.junit.BeforeClass;
import org.junit.Test;
public class DependencyFinderTest {
private static DependencyFinder finder;
@BeforeClass
public static void init() throws Exception {
finder = new DependencyFinder();
}
@Test
public void verifyDependencies()
throws Exception {
String targetClss =
"test.com.acme.dona.dep.DependencyFind";
Filter[] filtr = new Filter[] {
new RegexPackageFilter("java|junit|org")};
Dependency[] deps =
finder.findDependencies(targetClss, filtr);
assertNotNull("deps was null", deps);
assertEquals("should be 5 large", 5, deps.length);
}
}
package test.com.acme.dona.dep;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertNotNull;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Configuration;
import org.testng.annotations.Test;
public class DependencyFinderTest {
private DependencyFinder finder;
@BeforeClass
private void init(){
this.finder = new DependencyFinder();
}
@Test
public void verifyDependencies()
throws Exception {
String targetClss =
"test.com.acme.dona.dep.DependencyFind";
Filter[] filtr = new Filter[] {
new RegexPackageFilter("java|junit|org")};
Dependency[] deps =
finder.findDependencies(targetClss, filtr);
assertNotNull(deps, "deps was null" );
assertEquals(5, deps.length, "should be 5 large");
}
}
仔细观察,会发现一些不一样的地方。首先,JUnit要求BeforClass的方法为static,因此finder也随之需要声明为static。另外init方法必须声明为public。而TestNG却都不需要这样做。