java - 参数化 JUnit : Loading multiple property files from String array

Question

我正在尝试编写一个从字符串数组加载不同属性文件的测试。但代码不断抛出空指针异常，请问有什么想法吗？

@RunWith(value = Parameterized.class)
public class AllTests 
{ 
     private static String text;
     private static Properties props;

     public AllTests(String text) 
     {
        AllTests.text= text;
     }

     @Parameters
     public static List<String[]> data() 
     {
       String[][] data = new String[][] { { "test.properties" }};
    return Arrays.asList(data);
     }

         @BeforeClass
     public static void setup()
     {  
           props = new Properties();
         try 
         {
            //load a properties file 
        props.load(new FileInputStream(text));
         } 
         catch (IOException ex) 
         {
        ex.printStackTrace();
         }
 }

 @Test
 public void test() 
 {
        System.out.println(text);
 }}

我做了一些进一步的调查，发现 @Test stub 可以工作，但 @BeforeClass 返回 null，我可以不使用设置中的参数吗？

@RunWith(value = Parameterized.class)
public class AllTests 
{ 
     private static String client;


 public AllTests(String client) 
 {
    AllTests.client = client;
 }

 @Parameters
 public static Collection<Object[]> data() 
 {
    Object[][] data = new Object[][] { { "oxfam.properties" }};
   return Arrays.asList(data);
 }

 @BeforeClass
 public static void setup()
 {  
     System.out.println(client);
 }

 @Test
 public void test() 
 {
        System.out.println(client);
 }}

Answer 1

props 类变量从未初始化。尝试在声明时初始化它:

private static Properties props = new Properties();