1 /**

     2  * 

     3  */

     4 package org.junit.internal.runners.statements;

     5 

     6 import org.junit.runners.model.Statement;

     7 

     8 

     9 public class ExpectException extends Statement {

    10 	private Statement fNext;

    11 	private final Class<? extends Throwable> fExpected;

    12 	

    13 	public ExpectException(Statement next, Class<? extends Throwable> expected) {

    14 		fNext= next;

    15 		fExpected= expected;

    16 	}

    17 	

    18 	@Override

    19 	public void evaluate() throws Exception {

    20 		boolean complete = false;

    21 		try {

    22 			fNext.evaluate();

    23 			complete = true;

    24 		} catch (Throwable e) {

    25 			if (!fExpected.isAssignableFrom(e.getClass())) {

    26 				String message= "Unexpected exception, expected<"

    27 							+ fExpected.getName() + "> but was<"

    28 							+ e.getClass().getName() + ">";

    29 				throw new Exception(message, e);

    30 			}

    31 		}

    32 		if (complete)

    33 			throw new AssertionError("Expected exception: "

    34 					+ fExpected.getName());

    35 	}

    36 }