1 /*
2 * Copyright (C) 2019 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
17 #include <gtest/gtest.h>
18 #include <sys/param.h>
19
TEST(sys_param_test,powerof2_positives)20 TEST(sys_param_test, powerof2_positives) {
21 ASSERT_TRUE(powerof2(1));
22 ASSERT_TRUE(powerof2(2));
23 ASSERT_TRUE(powerof2(4));
24 ASSERT_TRUE(powerof2(8));
25 ASSERT_FALSE(powerof2(3));
26 ASSERT_FALSE(powerof2(5));
27 ASSERT_FALSE(powerof2(7));
28 ASSERT_FALSE(powerof2(9));
29 ASSERT_FALSE(powerof2(10));
30 }
31
TEST(sys_param_test,powerof2_zero)32 TEST(sys_param_test, powerof2_zero) {
33 // 0 isn't a power of 2, but for compatibility, we assume it is.
34 ASSERT_TRUE(powerof2(0));
35 uint32_t zero = 0;
36 ASSERT_TRUE(powerof2(zero));
37 }
38
TEST(sys_param_test,powerof2_negatives)39 TEST(sys_param_test, powerof2_negatives) {
40 // negative numbers can never be a power of 2, but for compatibility,
41 // we assume they can be.
42 int32_t min32 = INT32_MIN;
43 int64_t min64 = INT64_MIN;
44 ASSERT_TRUE(powerof2(min32));
45 ASSERT_FALSE(powerof2(min32 + 1));
46 ASSERT_TRUE(powerof2(min64));
47 ASSERT_FALSE(powerof2(min64 + 1));
48 }
49