1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
/*
* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
* @summary Basic tests for StableIntFunction methods
* @enablePreview
* @run junit StableIntFunctionTest
*/
import org.junit.jupiter.api.Test;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.IntFunction;
import static org.junit.jupiter.api.Assertions.*;
final class StableIntFunctionTest {
private static final int SIZE = 2;
private static final IntFunction<Integer> MAPPER = i -> i;
@Test
void factoryInvariants() {
assertThrows(IllegalArgumentException.class, () -> StableValue.intFunction(-1, MAPPER));
assertThrows(NullPointerException.class, () -> StableValue.intFunction(SIZE, null));
}
@Test
void basic() {
basic(MAPPER);
basic(i -> null);
}
void basic(IntFunction<Integer> mapper) {
StableTestUtil.CountingIntFunction<Integer> cif = new StableTestUtil.CountingIntFunction<>(mapper);
var cached = StableValue.intFunction(SIZE, cif);
assertEquals("[.unset, .unset]", cached.toString());
assertEquals(mapper.apply(1), cached.apply(1));
assertEquals(1, cif.cnt());
assertEquals(mapper.apply(1), cached.apply(1));
assertEquals(1, cif.cnt());
assertEquals("[.unset, " + mapper.apply(1) + "]", cached.toString());
assertThrows(IllegalArgumentException.class, () -> cached.apply(SIZE));
assertThrows(IllegalArgumentException.class, () -> cached.apply(-1));
assertThrows(IllegalArgumentException.class, () -> cached.apply(1_000_000));
}
@Test
void exception() {
StableTestUtil.CountingIntFunction<Integer> cif = new StableTestUtil.CountingIntFunction<>(_ -> {
throw new UnsupportedOperationException();
});
var cached = StableValue.intFunction(SIZE, cif);
assertThrows(UnsupportedOperationException.class, () -> cached.apply(1));
assertEquals(1, cif.cnt());
assertThrows(UnsupportedOperationException.class, () -> cached.apply(1));
assertEquals(2, cif.cnt());
assertEquals("[.unset, .unset]", cached.toString());
}
@Test
void circular() {
final AtomicReference<IntFunction<?>> ref = new AtomicReference<>();
IntFunction<IntFunction<?>> cached = StableValue.intFunction(SIZE, _ -> ref.get());
ref.set(cached);
cached.apply(0);
String toString = cached.toString();
assertEquals("[(this StableIntFunction), .unset]", toString);
assertDoesNotThrow(cached::hashCode);
assertDoesNotThrow((() -> cached.equals(cached)));
}
@Test
void equality() {
IntFunction<Integer> f0 = StableValue.intFunction(8, MAPPER);
IntFunction<Integer> f1 = StableValue.intFunction(8, MAPPER);
// No function is equal to another function
assertNotEquals(f0, f1);
}
@Test
void hashCodeStable() {
IntFunction<Integer> f0 = StableValue.intFunction(8, MAPPER);
assertEquals(System.identityHashCode(f0), f0.hashCode());
f0.apply(4);
assertEquals(System.identityHashCode(f0), f0.hashCode());
}
}
|
