Junit @BeforeClass不明白

這是我的TestClass。我嘗試解析CSV文件並創建一個Object [] []（調用data）。當我試圖給參數data時，它調用一個空指針。我不知道它爲什麼失敗。當我給像hardcore代碼的數據時，它真的有效。請解釋這一點，我不明白Junit @BeforeClass不明白

@RunWith(Parameterized.class) 
public class TestJUnit { 

public int firstParameter; 
public int secondParameter; 
public String operation; 
public int expectedResult; 

public static Object[][] data; 

public TestJUnit(int firstParameter, int secondParameter, String operation, int expectedResult) { 
    this.firstParameter = firstParameter; 
    this.secondParameter = secondParameter; 
    this.expectedResult = expectedResult; 
    this.operation = operation; 

} 

    @BeforeClass 
    public void makeData() throws IOException { 

     BufferedReader reader = new BufferedReader(new FileReader("C:\\Users\\third\\IdeaProjects\\MyJunit\\src\\test\\java\\com\\myLogicTest\\datafile.csv")); 

     ArrayList<Object[]> tempArray = new ArrayList<Object[]>(); 
     String newLine; 
     Object[] oneString; 
     while ((newLine = reader.readLine()) != null) { 


      oneString = newLine.split(";"); 
      tempArray.add(oneString); 
     } 
     data = new Object[tempArray.size()][]; 
     for (int i = 0; i < data.length; i++) { 
      Object[] row = tempArray.get(i); data[i] = row; } 
     }

@Test 
public void checkCalculator() { 
     final Calculator calculator = new Calculator(firstParameter, secondParameter, operation); 
     int result; 
     if (operation.equals("*")) { 
      result = calculator.multi(); 
      Assert.assertTrue("Результат (" + result + ") не равен" + expectedResult, result == expectedResult); 
     } 
     else if (operation.equals("+")) { 
      result = calculator.plus(); 
      Assert.assertTrue("Результат (" + result + ") не равен" + expectedResult, result == expectedResult); 
     } 
     else if (operation.equals("-")) { 
      result = calculator.minus(); 
      Assert.assertTrue("Результат (" + result + ") не равен" + expectedResult, result == expectedResult); 
     } 
     else if (operation.equals("/")) { 
      result = calculator.del(); 

      Assert.assertTrue("Результат (" + result + ") не равен" + expectedResult, result == expectedResult); 
     } 

     } 


    @Parameterized.Parameters(name = "{index}: Действие {0} {2} {1} = {3}") 
    public static Collection<Object[]> getTestData() { 
     return Arrays.asList(data 
       /* new Object[][]{ //<<<NULLPOINTER HERE 
       {2, 2, "*", 4}, 
       {2, 0, "+" , 2}, 
       {2, 2,"/", 1}, 
       {0, 2,"-",-2} 
     }*/); 
    } 
}

來源

2016-03-08 Aleks Be

NULLPOINTER HERE行似乎用/ *字符註釋。即使在運行時錯誤之前，這會給你一個編譯錯誤。 –

@RobertoLinares，不，這個評論是爲了在硬編碼模式下測試這個代碼，我只給了他一個沒有「數據」的新對象[] []，沒有更多 –

問題是標註@BeforeClass，當我們使用參數測試，@Before和@BeforeClass運行是不是第一次！在我的情況下，我需要在方法getTestData（）中調用方法makeData（）像這樣：

@Parameterized.Parameters(name = "{index}: Действие {0} {2} {1} = {3}") 
public static Collection<Object[]> getTestData() { 
    makedata(); // <<<<<I NEED USE IT HERE! 
    return Arrays.asList(data 
      /* new Object[][]{ //<<<NULLPOINTER HERE 
      {2, 2, "*", 4}, 
      {2, 0, "+" , 2}, 
      {2, 2,"/", 1}, 
      {0, 2,"-",-2} 
    }*/);

來源

2016-03-09 12:13:24

Junit @BeforeClass不明白

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