自动将测试从 JUnit 3 迁移到 JUnit 4 的最佳方法？

在我看来，这不可能那么难。所以让我们试试吧：

0. 进口

您需要导入三个注释：

import org.junit.After;
import org.junit.Before;
import org.junit.Test;`

进行以下几项更改后，将不需要 。import junit.framework.TestCase;

1. 注释方法test*

所有以 开头的方法都必须在 批注之前。使用正则表达式，此任务很容易。public void test@Test

2. 注释设置和拆解方法

Eclipse 生成以下方法：setUp()

@Override
protected void setUp() throws Exception { }

必须替换为：

@Before
public void setUp() throws Exception { }

与 ：tearDown()

@Override
protected void tearDown() throws Exception { }

替换为

@After
public void tearDown() throws Exception { }

3. 摆脱extends TestCase

删除字符串的每个文件正好一个匹配项

" extends TestCase"

4. 删除主要方法？

可能有必要删除/重构将执行测试的现有主方法。

5. 将方法转换为suite()@RunWithClass

根据saua的评论，必须对方法进行转换。谢谢，苏阿！suite()

@RunWith(Suite.class)
@Suite.SuiteClasses({
  TestDog.class
  TestCat.class
  TestAardvark.class
})

结论

我认为，通过一组正则表达式可以很容易地完成，即使它会杀死我的大脑;)

以下是我用来执行 furtelwart 建议的实际正则表达式：

// Add @Test
Replace:
^[ \t]+(public +void +test)
With:
    @Test\n    $1
Regular Expression: on
Case sensitive: on
File name filter:
*Test.java

// Remove double @Test's on already @Test annotated files
Replace:
^[ \t]+@Test\n[ \t]+@Test
With:
    @Test
Regular Expression: on
Case sensitive: on
File name filter:
*Test.java


// Remove all empty setUp's
Replace:
^[ \*]+((public|protected) +)?void +setUp\(\)[^\{]*\{\s*(super\.setUp\(\);)?\s*\}\n([ \t]*\n)?
With nothing
Regular Expression: on
Case sensitive: on
File name filter:
*Test.java

// Add @Before to all setUp's
Replace:
^([ \t]+@Override\n)?[ \t]+((public|protected) +)?(void +setUp\(\))
With:
    @Before\n    public void setUp()
Regular Expression: on
Case sensitive: on
File name filter:
*Test.java

// Remove double @Before's on already @Before annotated files
Replace:
^[ \t]+@Before\n[ \t]+@Before
With:
    @Before
Regular Expression: on
Case sensitive: on
File name filter:
*Test.java


// Remove all empty tearDown's
Replace:
^[ \*]+((public|protected) +)?void +tearDown\(\)[^\{]*\{\s*(super\.tearDown\(\);)?\s*\}\n([ \t]*\n)?
With nothing
Regular Expression: on
Case sensitive: on
File name filter:
*Test.java

// Add @After to all tearDown's
Replace:
^([ \t]+@Override\n)?[ \t]+((public|protected) +)?(void +tearDown\(\))
With:
    @After\n    public void tearDown()
Regular Expression: on
Case sensitive: on
File name filter:
*Test.java

// Remove double @After's on already @After annotated files
Replace:
^[ \t]+@After\n[ \t]+@After
With:
    @After
Regular Expression: on
Case sensitive: on
File name filter:
*Test.java


// Remove old imports, add new imports
Replace:
^([ \t]*import[ \t]+junit\.framework\.Assert;\n)?[ \t]*import[ \t]+junit\.framework\.TestCase;
With:
import org.junit.After;\nimport org.junit.Before;\nimport org.junit.Test;\nimport static org.junit.Assert.*;
Regular Expression: on
Case sensitive: on
File name filter:
*Test.java


// Remove all extends TestCase
Replace:
[ \t]+extends[ \t]+TestCase[ \t]+\{
With:
 {
Regular Expression: on
Case sensitive: on
File name filter:
*Test.java



// Look for import junit.framework;
Find:
import junit\.framework
Manually fix
Regular Expression: on
Case sensitive: on


// Look for ignored tests (FIXME, disabled, ...)
Find:
public[ \t]+void[ \t]+\w+test
Manually fix
Regular Expression: on
Case sensitive: on


// Look for dummy/empty tests
Find:
public[ \t]+void[ \t]+test[\w\d]*\(\s*\)\s*\{\s*(//[^\n]*)?\s*\}
Manually fix
Regular Expression: on
Case sensitive: on

注意：按照上面显示的顺序进行操作非常重要。