java - 如何设计数据驱动的 JUnit 测试类

Question

@Parameters
public static Collection data() throws IOException {       
   ArrayList<String> lines = new ArrayList();

   URL url = PokerhandTestCase.class.getClassLoader().getResource("test/TestFile.txt");
   File testFile = new File(url.getFile());
   FileReader fileReader = new FileReader(testFile);
   bufReader = new BufferedReader(fileReader);
   assertFalse("Failed to load the test file.", testFile == null);

   boolean isEOF = false;
   while (!isEOF){

        String aline = bufReader.readLine();

        if (aline == null){
            System.out.println("Done processing.");
            isEOF = true;
        }

        lines.add(aline);   
   }

   return Arrays.asList(lines); 

 }

程序的最后一行导致崩溃，我想知道从 arrayList 定义集合的正确方法是什么。这个函数需要 Collection 作为返回类型。

Answer 1

用这个替换最后一行:

return (Collection)lines;

由于 ArrayList 实现了 Collection 接口(interface): http://docs.oracle.com/javase/6/docs/api/java/util/ArrayList.html

所以整体代码:

  public static Collection data() throws IOException 
  {
    ArrayList<String> lines = new ArrayList();
    // populate lines collection...
    return (Collection)lines;
  }

根据下面的评论，也许这符合“数组集合”的条件:

  public static Collection data() throws IOException 
  {
    ArrayList<String> array1 = new ArrayList();
    ArrayList<String> array2 = new ArrayList();
    ArrayList<String> array3 = new ArrayList();
    // populate lines collection...
    ArrayList<ArrayList<String>> lines = new ArrayList();
    lines.add(array1);
    lines.add(array2);
    lines.add(array3);
    return (Collection)lines;
  }