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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <string>
#include "base/metrics/field_trial_param_associator.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/run_loop.h"
#include "base/task/post_task.h"
#include "base/test/scoped_feature_list.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/browser_process_impl.h"
#include "chrome/browser/chrome_content_browser_client.h"
#include "chrome/browser/net/system_network_context_manager.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "chrome/test/base/in_process_browser_test.h"
#include "chrome/test/base/ui_test_utils.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/network_service_instance.h"
#include "content/public/common/content_features.h"
#include "content/public/common/service_manager_connection.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/browser_test_base.h"
#include "content/public/test/browser_test_utils.h"
#include "net/nqe/effective_connection_type.h"
#include "net/nqe/network_quality_estimator.h"
#include "net/test/embedded_test_server/embedded_test_server.h"
#include "services/network/network_service.h"
#include "services/network/public/cpp/features.h"
#include "services/network/public/cpp/network_quality_tracker.h"
// Tests if the save data header holdback works as expected.
class NetInfoNetworkQualityEstimatorHoldbackBrowserTest
: public InProcessBrowserTest,
public testing::WithParamInterface<bool> {
protected:
NetInfoNetworkQualityEstimatorHoldbackBrowserTest() {
ConfigureHoldbackExperiment();
}
void SetUp() override {
test_server_.ServeFilesFromSourceDirectory(GetChromeTestDataDir());
ASSERT_TRUE(test_server_.Start());
InProcessBrowserTest::SetUp();
}
void VerifyNetworkQualityNetInfoWebAPI(
const std::string& expected_effective_connection_type) {
ui_test_utils::NavigateToURL(browser(),
test_server_.GetURL("/net_info.html"));
content::NavigationEntry* entry =
GetWebContents()->GetController().GetVisibleEntry();
EXPECT_EQ(content::PAGE_TYPE_NORMAL, entry->GetPageType());
EXPECT_EQ(expected_effective_connection_type,
RunScriptExtractString("getEffectiveType()"));
if (expected_effective_connection_type == "slow-2g") {
VerifyRtt(base::TimeDelta::FromMilliseconds(3600),
RunScriptExtractDouble("getRtt()"));
VerifyDownlinkKbps(40, RunScriptExtractDouble("getDownlink()") * 1000);
} else if (expected_effective_connection_type == "2g") {
VerifyRtt(base::TimeDelta::FromMilliseconds(1800),
RunScriptExtractDouble("getRtt()"));
VerifyDownlinkKbps(75, RunScriptExtractDouble("getDownlink()") * 1000);
} else if (expected_effective_connection_type == "3g") {
VerifyRtt(base::TimeDelta::FromMilliseconds(450),
RunScriptExtractDouble("getRtt()"));
VerifyDownlinkKbps(400, RunScriptExtractDouble("getDownlink()") * 1000);
} else if (expected_effective_connection_type == "4g") {
VerifyRtt(base::TimeDelta::FromMilliseconds(175),
RunScriptExtractDouble("getRtt()"));
VerifyDownlinkKbps(1600, RunScriptExtractDouble("getDownlink()") * 1000);
} else {
DCHECK(false);
}
}
void ConfigureHoldbackExperiment() {
std::map<std::string, std::string> params;
if (GetParam()) {
params["web_effective_connection_type_override"] = "2G";
}
scoped_feature_list_.InitAndEnableFeatureWithParameters(
features::kNetworkQualityEstimatorWebHoldback, params);
}
// Simulates a network quality change.
void SimulateNetworkQualityChange(net::EffectiveConnectionType type) {
g_browser_process->network_quality_tracker()
->ReportEffectiveConnectionTypeForTesting(type);
// Values taken from net/nqe/network_quality_estimator_params.h.
// TODO(tbansal): Declare the values in a common place, and read
// them directly.
if (type == net::EFFECTIVE_CONNECTION_TYPE_3G) {
g_browser_process->network_quality_tracker()
->ReportRTTsAndThroughputForTesting(
base::TimeDelta::FromMilliseconds(450), 400);
} else if (type == net::EFFECTIVE_CONNECTION_TYPE_SLOW_2G) {
g_browser_process->network_quality_tracker()
->ReportRTTsAndThroughputForTesting(
base::TimeDelta::FromMilliseconds(3600), 40);
} else {
NOTREACHED();
}
}
private:
content::WebContents* GetWebContents() const {
return browser()->tab_strip_model()->GetActiveWebContents();
}
void VerifyRtt(base::TimeDelta expected_rtt, int32_t got_rtt_milliseconds) {
EXPECT_EQ(0, got_rtt_milliseconds % 50)
<< " got_rtt_milliseconds=" << got_rtt_milliseconds;
if (expected_rtt > base::TimeDelta::FromMilliseconds(3000))
expected_rtt = base::TimeDelta::FromMilliseconds(3000);
// The difference between the actual and the estimate value should be within
// 10%. Add 50 (bucket size used in Blink) to account for the cases when the
// sample may spill over to the next bucket due to the added noise of 10%.
// For example, if sample is 300 msec, after adding noise, it may become
// 330, and after rounding off, it would spill over to the next bucket of
// 350 msec.
EXPECT_GE((expected_rtt.InMilliseconds() * 0.1) + 50,
std::abs(expected_rtt.InMilliseconds() - got_rtt_milliseconds));
}
void VerifyDownlinkKbps(double expected_kbps, double got_kbps) {
// First verify that |got_kbps| is a multiple of 50.
int quotient = static_cast<int>(got_kbps / 50);
// |mod| is the remainder left after dividing |got_kbps| by 50 while
// restricting the quotient to integer. For example, if |got_kbps| is
// 1050, then mod will be 0. If |got_kbps| is 1030, mod will be 30.
double mod = got_kbps - 50 * quotient;
EXPECT_LE(0.0, mod);
EXPECT_GT(50.0, mod);
// It is possible that |mod| is not exactly 0 because of floating point
// computations. e.g., |got_kbps| may be 99.999999, in which case |mod|
// will be 49.999999.
EXPECT_TRUE(mod < (1e-5) || (50 - mod) < 1e-5) << " got_kbps=" << got_kbps;
if (expected_kbps > 10000)
expected_kbps = 10000;
// The difference between the actual and the estimate value should be within
// 10%. Add 50 (bucket size used in Blink) to account for the cases when the
// sample may spill over to the next bucket due to the added noise of 10%.
// For example, if sample is 300 kbps, after adding noise, it may become
// 330, and after rounding off, it would spill over to the next bucket of
// 350 kbps.
EXPECT_GE((expected_kbps * 0.1) + 50, std::abs(expected_kbps - got_kbps));
}
std::string RunScriptExtractString(const std::string& script) {
std::string data;
EXPECT_TRUE(content::ExecuteScriptAndExtractString(
browser()->tab_strip_model()->GetActiveWebContents(), script, &data));
return data;
}
double RunScriptExtractDouble(const std::string& script) {
double data = 0.0;
EXPECT_TRUE(ExecuteScriptAndExtractDouble(
browser()->tab_strip_model()->GetActiveWebContents(), script, &data));
return data;
}
int RunScriptExtractInt(const std::string& script) {
int data = 0;
EXPECT_TRUE(ExecuteScriptAndExtractInt(
browser()->tab_strip_model()->GetActiveWebContents(), script, &data));
return data;
}
net::EmbeddedTestServer test_server_;
base::test::ScopedFeatureList scoped_feature_list_;
};
// Make sure the changes in the effective connection typeare notified to the
// render thread.
IN_PROC_BROWSER_TEST_P(NetInfoNetworkQualityEstimatorHoldbackBrowserTest,
EffectiveConnectionTypeChangeNotified) {
SimulateNetworkQualityChange(net::EFFECTIVE_CONNECTION_TYPE_3G);
base::RunLoop().RunUntilIdle();
EXPECT_TRUE(embedded_test_server()->Start());
ui_test_utils::NavigateToURL(
browser(), embedded_test_server()->GetURL("/net_info.html"));
if (GetParam()) {
// ConfigureHoldbackExperiment() sets holdback ECT to 2G.
VerifyNetworkQualityNetInfoWebAPI("2g");
} else {
VerifyNetworkQualityNetInfoWebAPI("3g");
}
SimulateNetworkQualityChange(net::EFFECTIVE_CONNECTION_TYPE_SLOW_2G);
base::RunLoop().RunUntilIdle();
if (GetParam()) {
// ConfigureHoldbackExperiment() sets holdback ECT to 2G.
VerifyNetworkQualityNetInfoWebAPI("2g");
} else {
VerifyNetworkQualityNetInfoWebAPI("slow-2g");
}
}
// The network quality estimator web holdback is enabled only if the first
// param is true.
INSTANTIATE_TEST_SUITE_P(,
NetInfoNetworkQualityEstimatorHoldbackBrowserTest,
testing::Bool());
|
