1 /*
2 * Copyright (C) 2017 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
19 #include "chre/apps/wifi_offload/channel_histogram.h"
20 #include "include/random_generator.h"
21 #include "include/utility.h"
22
23 using wifi_offload_test::kAllChannels_Test;
24 using wifi_offload_test::kAllFrequencies_Test;
25 using wifi_offload_test::kNumFrequencies_Test;
26
27 /**
28 * This file includes all the unit tests for ChannelHistogram class, except ==
29 * operator and serialize/deserialize functions which have already been covered
30 * in offloadtypes_test.cc.
31 */
32
33 class ChannelHistogramTest : public testing::Test {
34 public:
35 wifi_offload_test::RandomGenerator random_gen_;
36 wifi_offload::ChannelHistogram channel_histo_;
37 };
38
TEST_F(ChannelHistogramTest,UnsupportedFrequencyAndchannel_numbersAreHandled)39 TEST_F(ChannelHistogramTest, UnsupportedFrequencyAndchannel_numbersAreHandled) {
40 // some unsupported frequencies
41 channel_histo_.IncrementScanCountForFrequency(2000);
42 channel_histo_.IncrementScanCountForFrequency(42000);
43
44 // verify no count have been increased
45 for (size_t i = 0; i < kNumFrequencies_Test; i++) {
46 ASSERT_EQ(0, channel_histo_.GetChannelScanCount(kAllChannels_Test[i]));
47 }
48
49 // some unsupported channel numbers
50 EXPECT_EQ(0, channel_histo_.GetChannelScanCount(0));
51 EXPECT_EQ(0, channel_histo_.GetChannelScanCount(15));
52 EXPECT_EQ(0, channel_histo_.GetChannelScanCount(200));
53 }
54
TEST_F(ChannelHistogramTest,FrequenciesMapCorrectlyTochannel_numbers)55 TEST_F(ChannelHistogramTest, FrequenciesMapCorrectlyTochannel_numbers) {
56 for (size_t i = 0; i < kNumFrequencies_Test; i++) {
57 wifi_offload::ChannelHistogram histo;
58 histo.IncrementScanCountForFrequency(kAllFrequencies_Test[i]);
59
60 // verify only the increase channel is non-zero
61 for (size_t j = 0; j < kNumFrequencies_Test; j++) {
62 EXPECT_EQ(kAllChannels_Test[i] == kAllChannels_Test[j] ? 255 : 0,
63 histo.GetChannelScanCount(kAllChannels_Test[j]));
64 }
65 }
66 }
67
TEST_F(ChannelHistogramTest,IncreaseFrequencyScanCountAndGetChannelScanCount)68 TEST_F(ChannelHistogramTest, IncreaseFrequencyScanCountAndGetChannelScanCount) {
69 uint32_t increase = 1;
70 for (size_t i = 0; i < 12; i++) {
71 increase *= 2;
72 channel_histo_.IncrementScanCountForFrequencyForTest(
73 kAllFrequencies_Test[i], increase);
74 }
75
76 uint32_t expected = 1;
77 for (size_t i = 0; i < 12; i++) {
78 uint8_t scaled_value =
79 channel_histo_.GetChannelScanCount(kAllChannels_Test[i]);
80
81 expected *= 2;
82 EXPECT_EQ(expected * 254 / increase + 1, scaled_value);
83 }
84
85 for (size_t i = 12; i < 14; i++) {
86 EXPECT_EQ(0, channel_histo_.GetChannelScanCount(kAllChannels_Test[i]));
87 }
88 }
89
TEST_F(ChannelHistogramTest,SetScanCountToMaxUInt32)90 TEST_F(ChannelHistogramTest, SetScanCountToMaxUInt32) {
91 // add some nice scan counts
92 uint32_t increase = 1;
93 for (size_t i = 0; i < 12; i++) {
94 increase *= 2;
95 channel_histo_.IncrementScanCountForFrequencyForTest(
96 kAllFrequencies_Test[i], increase);
97 }
98 /* set the next scan count to be 2 ^ 32 - 1, this will force all other counts
99 * to get mapped to 1 */
100 channel_histo_.IncrementScanCountForFrequencyForTest(kAllFrequencies_Test[12],
101 0xffffffff);
102
103 for (size_t i = 0; i < 12; i++) {
104 EXPECT_EQ(1, channel_histo_.GetChannelScanCount(kAllChannels_Test[i]));
105 }
106 EXPECT_EQ(255, channel_histo_.GetChannelScanCount(kAllChannels_Test[12]));
107 }
108
