How to notify JUnit of exceptions thrown in @DataPoints annotated methods?

Question

I applied a general test for methods hashCodeand equalsusing the JUnit experimental annotation @Theory. The test case class itself is based on the dfa version .

However, when I tried to test the class java.net.InetAddress, I ran into a particular problem if the method providing the data contains code that throws an exception (in this case UnknownHostException):

So, I tried two alternatives that led to the same unsatisfactory result:

• Declare the method as the appropriate exception:

  @DataPoints
  public static InetAddress[] declareException() throws UnknownHostException {
      return new InetAddress[] {
          InetAddress.getByName("not a valid internet address")
      };
  }
  

• Explicitly catch the exception and re-throw as AssertionError:

  @DataPoints
  public static InetAddress[] rethrowAsAssertionError() {
      try {
          return new InetAddress[] {
              InetAddress.getByName("not a valid internet address")
          };
      } catch(UnknownHostException ex) {
          throw new AssertionError(ex);
      }
  }
  

a AssertionError " , . : []", @DataPoints.

- , JUnit (, , ) JUnit?

Answer 1

137: DataPoints.

- @BeforeClass, DataPoints:

private static InetAddress[] datapoints;

@BeforeClass
public static void generateData() throws UnknownHostException {
  // do all the work of generating the datapoints
  datapoints = new InetAddress[] {
    InetAddress.getByName("not a valid internet address")
  };
}

@DataPoints
public static InetAddress[] data() {
  return datapoints;
}

.

328: @, DataPoints, , .

Answer 2

. . . DataPoints. , .