将列表<T>转换为集合<对象[]>，用于 JUnit 参数化测试

Question

我想在数据是外部的情况下执行JUnit参数化测试。我有一个对象列表，只需要知道如何将其转换为对象数组的集合。我看到下面的堆栈溢出问题，但我想从从我的方法读取的文件中添加数据。

使用非基元参数的参数化 JUnit 测试？

工作代码：像这样：

@RunWith(Parameterized.class)
public class sampletest {
  private BranchMailChildSample branch;
  public sampletest(BranchMailChildSample branch)
  {
    this.branch = branch;
  }
  @Parameters
  public static Collection<Object[]> data()
  {
    String excel = "C:\Resources\TestData\ExcelSheets\BranchMail\branchmail_TestData.xlsx";
    ExcelMarshallerTool tool = new ExcelMarshallerTool(excel);
    List<BranchMailChildSample> items = tool.unmarshallExcel(BranchMailChildSample.class);
   //RIGHT HERE I NEED HELP: Convert list to Collection<Object[]>
    //return items as Collection of object arrays 
  }
  @Test
  public void test()
  {
    System.out.println(branch.toString());
  }
}

Answer 1

您不必转换列表。

@RunWith(Parameterized.class)
public class SampleTest {
  @Parameters(name = "{0}")
  public static List<BranchMailChildSample> data() {
    String excel = "C:\Resources\TestData\ExcelSheets\BranchMail\branchmail_TestData.xlsx";
    ExcelMarshallerTool tool = new ExcelMarshallerTool(excel);
    return tool.unmarshallExcel(BranchMailChildSample.class);
  }
  @Parameter(0)
  public BranchMailChildSample branch;
  @Test
  public void test() {
    System.out.println(branch.toString());
  }
}

我使用了字段注入，因为它需要的代码比构造函数注入少。将名称设置为受测对象可打印更有用的输出。请查看参数化运行器的文档。

如果您不喜欢公共字段，可以使用构造函数注入。

@RunWith(Parameterized.class)
public class SampleTest {
  @Parameters(name = "{0}")
  public static List<BranchMailChildSample> data() {
    String excel = "C:\Resources\TestData\ExcelSheets\BranchMail\branchmail_TestData.xlsx";
    ExcelMarshallerTool tool = new ExcelMarshallerTool(excel);
    return tool.unmarshallExcel(BranchMailChildSample.class);
  }
  private final BranchMailChildSample branch;
  public SampleTest(BranchMailChildSample branch) {
    this.branch = branch;
  }
  @Test
  public void test() {
    System.out.println(branch.toString());
  }
}

Answer 2

这就是为什么

我建议你尽可能使用TestNG。它的工作方式与 JUnit 相同，但您可以使用内部或外部数据提供程序，按给定顺序执行方法......使用起来更方便

//This method will provide data to any test method that declares that its Data Provider
//is named "test1"
@DataProvider(name = "test1")
public Object[][] createData1() {
 return new Object[][] {
   { "Cedric", new Integer(36) },
   { "Anne", new Integer(37)},
 };
}
//This test method declares that its data should be supplied by the Data Provider
//named "test1"
@Test(dataProvider = "test1")
public void verifyData1(String n1, Integer n2) {
 System.out.println(n1 + " " + n2);
}

Answer 3

我让它这样做：

    List<BranchMailChildSample> items = tool.unmarshallExcel(BranchMailChildSample.class);
    Collection<Object[]> data = new ArrayList<Object[]>();
    for(BranchMailChildSample item : items)
    {
        Object[] objItem = new Object[] { item };
        data.add(objItem);
    }
    return data;

Answer 4

实际上，如果您使用 JUnit 4.12 和理论运行器，这样的事情应该可以工作：

@RunWith(Theories.class)
public class MyTest 
{
   @DataPoints public static List<MyClass> myFunctionThatReturnsTestData() 
   {
        // TODO
   }
   @Theory
   public void canDoTheThing(MyClass m) throws Exception {