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[FAQ]为什么JUnit的标准测试方法没有任何返回值？
引用Kent Beck, Erich Gamma，连接地址：http://junit.sourceforge.net/doc/cookbook/cookbook.htm
Often if a method doesn't return a value, it will have some side effect. Actually, if it doesn't return a value AND doesn't have a side effect, it isn't doing anything.
There may be a way to verify that the side effect actually occurred as expected. For example, consider the add() method in the Collection classes. There are ways of verifying that the side effect happened (i.e. the object was added). You can check the size and assert that it is what is expected:
public void testCollectionAdd() {
Collection collection = new ArrayList();
assertEquals(0, collection.size());
collection.add("itemA");
assertEquals(1, collection.size());
collection.add("itemB");
assertEquals(2, collection.size());
}
Another approach is to make use of MockObjects.
A related issue is to design for testing. For example, if you have a method that is meant to output to a file, don't pass in a filename, or even a FileWriter. Instead, pass in a Writer. That way you can pass in a StringWriter to capture the output for testing purposes. Then you can add a method (e.g. writeToFileNamed(String filename)) to encapsulate the FileWriter creation.
[ 此贴被Fastpoint在2005-10-17 11:10重新编辑 ]
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[楼 主]
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Posted: 2005-10-14 19:50 |
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软件测试基地论坛 -> 新手园地 -> [FAQ]为什么JUnit的标准测试方法没有任何返回值？
