junit 测试 这是什么错误啊

[司马他]

机的运行成功过忽然之间就不行了

package junit;

import junit.framework.Assert;
import junit.framework.TestCase;

public class arrayTest extends TestCase{
	
	array array;
	
	public void setUp ()
	{
		array = new array();
	}
	
	public void testGetLargest(){
		int[] a={3,4,5,6};
		int result = 0;
		try {
			
			result = array.getLargest(a);
			
		} catch (Exception e) {
			
			e.printStackTrace();
			Assert.fail("test fail");
		}
		Assert.assertEquals(6, result);
	}
	
	public void testgetLargest2(){
	    Throwable tx = null;
	    int[] a = {};
	    try{
	    	array.getLargest(a);
	    	Assert.fail("test");
	    }
	    catch(Exception ex){
	    	tx = ex;
	    }
	    Assert.assertNotNull(tx);
	    Assert.assertEquals(Exception.class, tx.getClass());
	    Assert.assertEquals("array can't be null",tx.getMessage());
	}
	
//	public void testgetLargest3(){
//		Throwable tx = null;
//		int[] a = null;
//		try{
//			array.getLargest(a);
//			Assert.fail();
//		}catch(Exception ex){
//			tx = ex;
//		}
//		Assert.assertNotNull(tx);
//		Assert.assertEquals(Exception.class, tx.getClass());
//		Assert.assertEquals("length is null", tx.getMessage());
//	}

		
}

package junit;

public class array {
	
	
	
	public int getLargest(int[] array) throws Exception
	{
		
		if (array == null||array.length == 0){
			throw new Exception("The array can't be null");
		}
		else
		{
			int largest = array[0];
			for(int i=0;i<array.length;i++){
				if(largest < array[i]){
					largest = array[i];
				}
			}
			return largest;
		}
	}

}

错误是：

arrayTest
junit.arrayTest
testgetLargest2(junit.arrayTest)
junit.framework.ComparisonFailure: null expected:<[]array can't be null> but was:<[The ]array can't be null>

	at junit.framework.Assert.assertEquals(Assert.java:81)

	at junit.framework.Assert.assertEquals(Assert.java:87)

	at junit.arrayTest.testgetLargest2(arrayTest.java:42)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

	at java.lang.reflect.Method.invoke(Unknown Source)

	at junit.framework.TestCase.runTest(TestCase.java:168)

	at junit.framework.TestCase.runBare(TestCase.java:134)

	at junit.framework.TestResult$1.protect(TestResult.java:110)

	at junit.framework.TestResult.runProtected(TestResult.java:128)

	at junit.framework.TestResult.run(TestResult.java:113)

	at junit.framework.TestCase.run(TestCase.java:124)

	at junit.framework.TestSuite.runTest(TestSuite.java:243)

	at junit.framework.TestSuite.run(TestSuite.java:238)

	at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)

	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)

	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)

	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)

	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

[小笨熊]

实际值和期望值不一致