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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.tradefed.util;
     17 
     18 import junit.framework.TestCase;
     19 
     20 /**
     21  * Unit tests for {@link NullUtil}
     22  */
     23 public class NullUtilTest extends TestCase {
     24     /**
     25      * Make sure countNulls works as expected
     26      */
     27     public void testCountNulls() throws Exception {
     28         assertEquals(0, NullUtil.countNulls());
     29         assertEquals(0, NullUtil.countNulls("hi"));
     30 
     31         assertEquals(1, NullUtil.countNulls((Object)null));
     32         assertEquals(1, NullUtil.countNulls(null, "hi"));
     33         assertEquals(1, NullUtil.countNulls("hi", null));
     34 
     35         assertEquals(2, NullUtil.countNulls(null, null));
     36     }
     37 
     38     /**
     39      * Make sure countNonNulls works as expected
     40      */
     41     public void testCountNonNulls() throws Exception {
     42         assertEquals(0, NullUtil.countNonNulls());
     43         assertEquals(0, NullUtil.countNonNulls((Object)null));
     44 
     45         assertEquals(1, NullUtil.countNonNulls("hi"));
     46         assertEquals(1, NullUtil.countNonNulls(null, "hi"));
     47         assertEquals(1, NullUtil.countNonNulls("hi", null));
     48 
     49         assertEquals(2, NullUtil.countNonNulls("hi", "hi"));
     50     }
     51 
     52     /**
     53      * Make sure allNull works as expected
     54      */
     55     public void testAllNull() throws Exception {
     56         assertTrue(NullUtil.allNull());
     57         assertTrue(NullUtil.allNull((Object)null));
     58         assertTrue(NullUtil.allNull(null, null));
     59 
     60         assertFalse(NullUtil.allNull(1));
     61         assertFalse(NullUtil.allNull(1, null, null));
     62         assertFalse(NullUtil.allNull(null, null, 1));
     63     }
     64 
     65     /**
     66      * Ensure that we return true only when exactly one passed value is non-null
     67      */
     68     public void testSingleNonNull() throws Exception {
     69         assertFalse(NullUtil.singleNonNull());
     70 
     71         assertFalse(NullUtil.singleNonNull(null, null, null));
     72         assertTrue(NullUtil.singleNonNull(1, null, null));
     73         assertTrue(NullUtil.singleNonNull(null, null, 1));
     74         assertFalse(NullUtil.singleNonNull(1, null, 1));
     75         assertFalse(NullUtil.singleNonNull(1, 1, 1));
     76     }
     77 
     78     /**
     79      * Ensure that we return true only when it is not the case that a null object is simultaneously
     80      * present with a non-null object
     81      */
     82     public void testHomogeneousSet() throws Exception {
     83         assertTrue(NullUtil.isHomogeneousSet());
     84 
     85         assertTrue(NullUtil.isHomogeneousSet(1));
     86         assertTrue(NullUtil.isHomogeneousSet((Object)null));
     87 
     88         assertTrue(NullUtil.isHomogeneousSet(1, 1));
     89         assertTrue(NullUtil.isHomogeneousSet(null, null));
     90 
     91         assertFalse(NullUtil.isHomogeneousSet(1, null));
     92         assertFalse(NullUtil.isHomogeneousSet(null, 1));
     93     }
     94 }
     95 
     96