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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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23 package org.openjdk.tests.java.util;
24 
25 import org.testng.annotations.Test;
26 
27 import java.util.Arrays;
28 import java.util.function.Consumer;
29 
30 import static org.testng.Assert.fail;
31 
32 /**
33  * NullArgsTestCase -- Given a Consumer&ltObject[]&gt, and an Object[] array of args, call the block with the args,
34  * assert success, and then call the consumer N times, each time setting one of the args to null, and assert that
35  * all these throw NPE.
36  *
37  * Typically this would be combined with a DataProvider that serves up combinations of things to be tested, as in
38  * IteratorsNullTest.
39  */
40 public abstract class NullArgsTestCase {
41     public final String name;
42     public final Consumer<Object[]> sink;
43     public final Object[] args;
44 
NullArgsTestCase(String name, Consumer<Object[]> sink, Object[] args)45     protected NullArgsTestCase(String name, Consumer<Object[]> sink, Object[] args) {
46         this.name = name;
47         this.sink = sink;
48         this.args = args;
49     }
50 
51     @Test
goodNonNull()52     public void goodNonNull() {
53         sink.accept(args);
54     }
55 
56     @Test
throwWithNull()57     public void throwWithNull() {
58         for (int i=0; i<args.length; i++) {
59             Object[] temp = Arrays.copyOf(args, args.length);
60             temp[i] = null;
61             try {
62                 sink.accept(temp);
63                 fail(String.format("Expected NullPointerException for argument %d of test case %s", i, name));
64             }
65             catch (NullPointerException e) {
66                 // Success
67             }
68         }
69     }
70 }
71