blob: c3569c2b136892a7a1d69e68ce87155436addac5 (
plain)
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
|
"use strict";
/**
* Tests the FX_TAB_SWITCH_SPINNER_VISIBLE_MS and
* FX_TAB_SWITCH_SPINNER_VISIBLE_LONG_MS telemetry probes
*/
let gMinHangTime = 500; // ms
let gMaxHangTime = 5 * 1000; // ms
/**
* Make a data URI for a generic webpage with a script that hangs for a given
* amount of time.
* @param {?Number} aHangMs Number of milliseconds that the hang should last.
* Defaults to 0.
* @return {String} The data URI generated.
*/
function makeDataURI(aHangMs = 0) {
return `data:text/html,
<html>
<head>
<meta charset="utf-8"/>
<title>Tab Spinner Test</title>
<script>
function hang() {
let hangDuration = ${aHangMs};
if (hangDuration > 0) {
let startTime = window.performance.now();
while(window.performance.now() - startTime < hangDuration) {}
}
}
</script>
</head>
<body>
<h1 id='header'>Tab Spinner Test</h1>
</body>
</html>`;
}
/**
* Returns the sum of all values in an array.
* @param {Array} aArray An array of integers
* @return {Number} The sum of the integers in the array
*/
function sum(aArray) {
return aArray.reduce(function(previousValue, currentValue) {
return previousValue + currentValue;
});
}
/**
* A generator intended to be run as a Task. It tests one of the tab spinner
* telemetry probes.
* @param {String} aProbe The probe to test. Should be one of:
* - FX_TAB_SWITCH_SPINNER_VISIBLE_MS
* - FX_TAB_SWITCH_SPINNER_VISIBLE_LONG_MS
*/
function* testProbe(aProbe) {
info(`Testing probe: ${aProbe}`);
let histogram = Services.telemetry.getHistogramById(aProbe);
let buckets = histogram.snapshot().ranges.filter(function(value) {
return (value > gMinHangTime && value < gMaxHangTime);
});
let delayTime = buckets[0]; // Pick a bucket arbitrarily
// The tab spinner does not show up instantly. We need to hang for a little
// bit of extra time to account for the tab spinner delay.
delayTime += gBrowser.selectedTab.linkedBrowser.getTabBrowser()._getSwitcher().TAB_SWITCH_TIMEOUT;
let dataURI1 = makeDataURI(delayTime);
let dataURI2 = makeDataURI();
let tab1 = yield BrowserTestUtils.openNewForegroundTab(gBrowser, dataURI1);
histogram.clear();
// Queue a hang in the content process when the
// event loop breathes next.
ContentTask.spawn(tab1.linkedBrowser, null, function*() {
content.wrappedJSObject.hang();
});
let tab2 = yield BrowserTestUtils.openNewForegroundTab(gBrowser, dataURI2);
let snapshot = histogram.snapshot();
yield BrowserTestUtils.removeTab(tab2);
yield BrowserTestUtils.removeTab(tab1);
ok(sum(snapshot.counts) > 0,
`Spinner probe should now have a value in some bucket`);
}
add_task(function* setup() {
yield SpecialPowers.pushPrefEnv({
set: [["dom.ipc.processCount", 1]]
});
});
add_task(testProbe.bind(null, "FX_TAB_SWITCH_SPINNER_VISIBLE_MS"));
add_task(testProbe.bind(null, "FX_TAB_SWITCH_SPINNER_VISIBLE_LONG_MS"));
|
