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
23using wifi_offload_test::kNumFrequencies_Test;
24using wifi_offload_test::kAllFrequencies_Test;
25using wifi_offload_test::kAllChannels_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
33class ChannelHistogramTest : public testing::Test {
34 public:
35  wifi_offload_test::RandomGenerator random_gen_;
36  wifi_offload::ChannelHistogram channel_histo_;
37};
38
39TEST_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
55TEST_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
68TEST_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
90TEST_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