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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head><title>Python: module telemetry.page.page_test</title>
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<td valign=bottom>&nbsp;<br>
<font color="#ffffff" face="helvetica, arial">&nbsp;<br><big><big><strong><a href="telemetry.html"><font color="#ffffff">telemetry</font></a>.<a href="telemetry.page.html"><font color="#ffffff">page</font></a>.page_test</strong></big></big></font></td
><td align=right valign=bottom
><font color="#ffffff" face="helvetica, arial"><a href=".">index</a><br><a href="../telemetry/page/page_test.py">telemetry/page/page_test.py</a></font></td></tr></table>
    <p><tt>#&nbsp;Copyright&nbsp;2012&nbsp;The&nbsp;Chromium&nbsp;Authors.&nbsp;All&nbsp;rights&nbsp;reserved.<br>
#&nbsp;Use&nbsp;of&nbsp;this&nbsp;source&nbsp;code&nbsp;is&nbsp;governed&nbsp;by&nbsp;a&nbsp;BSD-style&nbsp;license&nbsp;that&nbsp;can&nbsp;be<br>
#&nbsp;found&nbsp;in&nbsp;the&nbsp;LICENSE&nbsp;file.</tt></p>
<p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#aa55cc">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Modules</strong></big></font></td></tr>
    
<tr><td bgcolor="#aa55cc"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
<td width="100%"><table width="100%" summary="list"><tr><td width="25%" valign=top><a href="telemetry.page.action_runner.html">telemetry.page.action_runner</a><br>
</td><td width="25%" valign=top><a href="telemetry.core.exceptions.html">telemetry.core.exceptions</a><br>
</td><td width="25%" valign=top><a href="logging.html">logging</a><br>
</td><td width="25%" valign=top></td></tr></table></td></tr></table><p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ee77aa">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Classes</strong></big></font></td></tr>
    
<tr><td bgcolor="#ee77aa"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
<td width="100%"><dl>
<dt><font face="helvetica, arial"><a href="__builtin__.html#object">__builtin__.object</a>
</font></dt><dd>
<dl>
<dt><font face="helvetica, arial"><a href="telemetry.page.page_test.html#PageTest">PageTest</a>
</font></dt></dl>
</dd>
<dt><font face="helvetica, arial"><a href="exceptions.html#Exception">exceptions.Exception</a>(<a href="exceptions.html#BaseException">exceptions.BaseException</a>)
</font></dt><dd>
<dl>
<dt><font face="helvetica, arial"><a href="telemetry.page.page_test.html#MultiTabTestAppCrashError">MultiTabTestAppCrashError</a>
</font></dt><dt><font face="helvetica, arial"><a href="telemetry.page.page_test.html#TestNotSupportedOnPlatformError">TestNotSupportedOnPlatformError</a>
</font></dt></dl>
</dd>
<dt><font face="helvetica, arial"><a href="telemetry.web_perf.story_test.html#Failure">telemetry.web_perf.story_test.Failure</a>(<a href="exceptions.html#Exception">exceptions.Exception</a>)
</font></dt><dd>
<dl>
<dt><font face="helvetica, arial"><a href="telemetry.page.page_test.html#MeasurementFailure">MeasurementFailure</a>
</font></dt></dl>
</dd>
</dl>
 <p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ffc8d8">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#000000" face="helvetica, arial"><a name="MeasurementFailure">class <strong>MeasurementFailure</strong></a>(<a href="telemetry.web_perf.story_test.html#Failure">telemetry.web_perf.story_test.Failure</a>)</font></td></tr>
    
<tr bgcolor="#ffc8d8"><td rowspan=2><tt>&nbsp;&nbsp;&nbsp;</tt></td>
<td colspan=2><tt><a href="#PageTest">PageTest</a>&nbsp;<a href="exceptions.html#Exception">Exception</a>&nbsp;raised&nbsp;when&nbsp;an&nbsp;undesired&nbsp;but&nbsp;designed-for&nbsp;problem.<br>&nbsp;</tt></td></tr>
<tr><td>&nbsp;</td>
<td width="100%"><dl><dt>Method resolution order:</dt>
<dd><a href="telemetry.page.page_test.html#MeasurementFailure">MeasurementFailure</a></dd>
<dd><a href="telemetry.web_perf.story_test.html#Failure">telemetry.web_perf.story_test.Failure</a></dd>
<dd><a href="exceptions.html#Exception">exceptions.Exception</a></dd>
<dd><a href="exceptions.html#BaseException">exceptions.BaseException</a></dd>
<dd><a href="__builtin__.html#object">__builtin__.object</a></dd>
</dl>
<hr>
Data descriptors inherited from <a href="telemetry.web_perf.story_test.html#Failure">telemetry.web_perf.story_test.Failure</a>:<br>
<dl><dt><strong>__weakref__</strong></dt>
<dd><tt>list&nbsp;of&nbsp;weak&nbsp;references&nbsp;to&nbsp;the&nbsp;object&nbsp;(if&nbsp;defined)</tt></dd>
</dl>
<hr>
Methods inherited from <a href="exceptions.html#Exception">exceptions.Exception</a>:<br>
<dl><dt><a name="MeasurementFailure-__init__"><strong>__init__</strong></a>(...)</dt><dd><tt>x.<a href="#MeasurementFailure-__init__">__init__</a>(...)&nbsp;initializes&nbsp;x;&nbsp;see&nbsp;help(type(x))&nbsp;for&nbsp;signature</tt></dd></dl>

<hr>
Data and other attributes inherited from <a href="exceptions.html#Exception">exceptions.Exception</a>:<br>
<dl><dt><strong>__new__</strong> = &lt;built-in method __new__ of type object&gt;<dd><tt>T.<a href="#MeasurementFailure-__new__">__new__</a>(S,&nbsp;...)&nbsp;-&gt;&nbsp;a&nbsp;new&nbsp;<a href="__builtin__.html#object">object</a>&nbsp;with&nbsp;type&nbsp;S,&nbsp;a&nbsp;subtype&nbsp;of&nbsp;T</tt></dl>

<hr>
Methods inherited from <a href="exceptions.html#BaseException">exceptions.BaseException</a>:<br>
<dl><dt><a name="MeasurementFailure-__delattr__"><strong>__delattr__</strong></a>(...)</dt><dd><tt>x.<a href="#MeasurementFailure-__delattr__">__delattr__</a>('name')&nbsp;&lt;==&gt;&nbsp;del&nbsp;x.name</tt></dd></dl>

<dl><dt><a name="MeasurementFailure-__getattribute__"><strong>__getattribute__</strong></a>(...)</dt><dd><tt>x.<a href="#MeasurementFailure-__getattribute__">__getattribute__</a>('name')&nbsp;&lt;==&gt;&nbsp;x.name</tt></dd></dl>

<dl><dt><a name="MeasurementFailure-__getitem__"><strong>__getitem__</strong></a>(...)</dt><dd><tt>x.<a href="#MeasurementFailure-__getitem__">__getitem__</a>(y)&nbsp;&lt;==&gt;&nbsp;x[y]</tt></dd></dl>

<dl><dt><a name="MeasurementFailure-__getslice__"><strong>__getslice__</strong></a>(...)</dt><dd><tt>x.<a href="#MeasurementFailure-__getslice__">__getslice__</a>(i,&nbsp;j)&nbsp;&lt;==&gt;&nbsp;x[i:j]<br>
&nbsp;<br>
Use&nbsp;of&nbsp;negative&nbsp;indices&nbsp;is&nbsp;not&nbsp;supported.</tt></dd></dl>

<dl><dt><a name="MeasurementFailure-__reduce__"><strong>__reduce__</strong></a>(...)</dt></dl>

<dl><dt><a name="MeasurementFailure-__repr__"><strong>__repr__</strong></a>(...)</dt><dd><tt>x.<a href="#MeasurementFailure-__repr__">__repr__</a>()&nbsp;&lt;==&gt;&nbsp;repr(x)</tt></dd></dl>

<dl><dt><a name="MeasurementFailure-__setattr__"><strong>__setattr__</strong></a>(...)</dt><dd><tt>x.<a href="#MeasurementFailure-__setattr__">__setattr__</a>('name',&nbsp;value)&nbsp;&lt;==&gt;&nbsp;x.name&nbsp;=&nbsp;value</tt></dd></dl>

<dl><dt><a name="MeasurementFailure-__setstate__"><strong>__setstate__</strong></a>(...)</dt></dl>

<dl><dt><a name="MeasurementFailure-__str__"><strong>__str__</strong></a>(...)</dt><dd><tt>x.<a href="#MeasurementFailure-__str__">__str__</a>()&nbsp;&lt;==&gt;&nbsp;str(x)</tt></dd></dl>

<dl><dt><a name="MeasurementFailure-__unicode__"><strong>__unicode__</strong></a>(...)</dt></dl>

<hr>
Data descriptors inherited from <a href="exceptions.html#BaseException">exceptions.BaseException</a>:<br>
<dl><dt><strong>__dict__</strong></dt>
</dl>
<dl><dt><strong>args</strong></dt>
</dl>
<dl><dt><strong>message</strong></dt>
</dl>
</td></tr></table> <p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ffc8d8">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#000000" face="helvetica, arial"><a name="MultiTabTestAppCrashError">class <strong>MultiTabTestAppCrashError</strong></a>(<a href="exceptions.html#Exception">exceptions.Exception</a>)</font></td></tr>
    
<tr bgcolor="#ffc8d8"><td rowspan=2><tt>&nbsp;&nbsp;&nbsp;</tt></td>
<td colspan=2><tt><a href="#PageTest">PageTest</a>&nbsp;<a href="exceptions.html#Exception">Exception</a>&nbsp;raised&nbsp;after&nbsp;browser&nbsp;or&nbsp;tab&nbsp;crash&nbsp;for&nbsp;multi-tab&nbsp;tests.<br>
&nbsp;<br>
Used&nbsp;to&nbsp;abort&nbsp;the&nbsp;test&nbsp;rather&nbsp;than&nbsp;try&nbsp;to&nbsp;recover&nbsp;from&nbsp;an&nbsp;unknown&nbsp;state.<br>&nbsp;</tt></td></tr>
<tr><td>&nbsp;</td>
<td width="100%"><dl><dt>Method resolution order:</dt>
<dd><a href="telemetry.page.page_test.html#MultiTabTestAppCrashError">MultiTabTestAppCrashError</a></dd>
<dd><a href="exceptions.html#Exception">exceptions.Exception</a></dd>
<dd><a href="exceptions.html#BaseException">exceptions.BaseException</a></dd>
<dd><a href="__builtin__.html#object">__builtin__.object</a></dd>
</dl>
<hr>
Data descriptors defined here:<br>
<dl><dt><strong>__weakref__</strong></dt>
<dd><tt>list&nbsp;of&nbsp;weak&nbsp;references&nbsp;to&nbsp;the&nbsp;object&nbsp;(if&nbsp;defined)</tt></dd>
</dl>
<hr>
Methods inherited from <a href="exceptions.html#Exception">exceptions.Exception</a>:<br>
<dl><dt><a name="MultiTabTestAppCrashError-__init__"><strong>__init__</strong></a>(...)</dt><dd><tt>x.<a href="#MultiTabTestAppCrashError-__init__">__init__</a>(...)&nbsp;initializes&nbsp;x;&nbsp;see&nbsp;help(type(x))&nbsp;for&nbsp;signature</tt></dd></dl>

<hr>
Data and other attributes inherited from <a href="exceptions.html#Exception">exceptions.Exception</a>:<br>
<dl><dt><strong>__new__</strong> = &lt;built-in method __new__ of type object&gt;<dd><tt>T.<a href="#MultiTabTestAppCrashError-__new__">__new__</a>(S,&nbsp;...)&nbsp;-&gt;&nbsp;a&nbsp;new&nbsp;<a href="__builtin__.html#object">object</a>&nbsp;with&nbsp;type&nbsp;S,&nbsp;a&nbsp;subtype&nbsp;of&nbsp;T</tt></dl>

<hr>
Methods inherited from <a href="exceptions.html#BaseException">exceptions.BaseException</a>:<br>
<dl><dt><a name="MultiTabTestAppCrashError-__delattr__"><strong>__delattr__</strong></a>(...)</dt><dd><tt>x.<a href="#MultiTabTestAppCrashError-__delattr__">__delattr__</a>('name')&nbsp;&lt;==&gt;&nbsp;del&nbsp;x.name</tt></dd></dl>

<dl><dt><a name="MultiTabTestAppCrashError-__getattribute__"><strong>__getattribute__</strong></a>(...)</dt><dd><tt>x.<a href="#MultiTabTestAppCrashError-__getattribute__">__getattribute__</a>('name')&nbsp;&lt;==&gt;&nbsp;x.name</tt></dd></dl>

<dl><dt><a name="MultiTabTestAppCrashError-__getitem__"><strong>__getitem__</strong></a>(...)</dt><dd><tt>x.<a href="#MultiTabTestAppCrashError-__getitem__">__getitem__</a>(y)&nbsp;&lt;==&gt;&nbsp;x[y]</tt></dd></dl>

<dl><dt><a name="MultiTabTestAppCrashError-__getslice__"><strong>__getslice__</strong></a>(...)</dt><dd><tt>x.<a href="#MultiTabTestAppCrashError-__getslice__">__getslice__</a>(i,&nbsp;j)&nbsp;&lt;==&gt;&nbsp;x[i:j]<br>
&nbsp;<br>
Use&nbsp;of&nbsp;negative&nbsp;indices&nbsp;is&nbsp;not&nbsp;supported.</tt></dd></dl>

<dl><dt><a name="MultiTabTestAppCrashError-__reduce__"><strong>__reduce__</strong></a>(...)</dt></dl>

<dl><dt><a name="MultiTabTestAppCrashError-__repr__"><strong>__repr__</strong></a>(...)</dt><dd><tt>x.<a href="#MultiTabTestAppCrashError-__repr__">__repr__</a>()&nbsp;&lt;==&gt;&nbsp;repr(x)</tt></dd></dl>

<dl><dt><a name="MultiTabTestAppCrashError-__setattr__"><strong>__setattr__</strong></a>(...)</dt><dd><tt>x.<a href="#MultiTabTestAppCrashError-__setattr__">__setattr__</a>('name',&nbsp;value)&nbsp;&lt;==&gt;&nbsp;x.name&nbsp;=&nbsp;value</tt></dd></dl>

<dl><dt><a name="MultiTabTestAppCrashError-__setstate__"><strong>__setstate__</strong></a>(...)</dt></dl>

<dl><dt><a name="MultiTabTestAppCrashError-__str__"><strong>__str__</strong></a>(...)</dt><dd><tt>x.<a href="#MultiTabTestAppCrashError-__str__">__str__</a>()&nbsp;&lt;==&gt;&nbsp;str(x)</tt></dd></dl>

<dl><dt><a name="MultiTabTestAppCrashError-__unicode__"><strong>__unicode__</strong></a>(...)</dt></dl>

<hr>
Data descriptors inherited from <a href="exceptions.html#BaseException">exceptions.BaseException</a>:<br>
<dl><dt><strong>__dict__</strong></dt>
</dl>
<dl><dt><strong>args</strong></dt>
</dl>
<dl><dt><strong>message</strong></dt>
</dl>
</td></tr></table> <p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ffc8d8">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#000000" face="helvetica, arial"><a name="PageTest">class <strong>PageTest</strong></a>(<a href="__builtin__.html#object">__builtin__.object</a>)</font></td></tr>
    
<tr bgcolor="#ffc8d8"><td rowspan=2><tt>&nbsp;&nbsp;&nbsp;</tt></td>
<td colspan=2><tt>A&nbsp;class&nbsp;styled&nbsp;on&nbsp;unittest.TestCase&nbsp;for&nbsp;creating&nbsp;page-specific&nbsp;tests.<br>
&nbsp;<br>
Test&nbsp;should&nbsp;override&nbsp;ValidateAndMeasurePage&nbsp;to&nbsp;perform&nbsp;test<br>
validation&nbsp;and&nbsp;page&nbsp;measurement&nbsp;as&nbsp;necessary.<br>
&nbsp;<br>
&nbsp;&nbsp;&nbsp;class&nbsp;BodyChildElementMeasurement(<a href="#PageTest">PageTest</a>):<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;<a href="#PageTest-ValidateAndMeasurePage">ValidateAndMeasurePage</a>(self,&nbsp;page,&nbsp;tab,&nbsp;results):<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;body_child_count&nbsp;=&nbsp;tab.EvaluateJavaScript(<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'document.body.children.length')<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;results.AddValue(scalar.ScalarValue(<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;page,&nbsp;'body_children',&nbsp;'count',&nbsp;body_child_count))<br>&nbsp;</tt></td></tr>
<tr><td>&nbsp;</td>
<td width="100%">Methods defined here:<br>
<dl><dt><a name="PageTest-CustomizeBrowserOptions"><strong>CustomizeBrowserOptions</strong></a>(self, options)</dt><dd><tt>Override&nbsp;to&nbsp;add&nbsp;test-specific&nbsp;options&nbsp;to&nbsp;the&nbsp;BrowserOptions&nbsp;<a href="__builtin__.html#object">object</a></tt></dd></dl>

<dl><dt><a name="PageTest-DidNavigateToPage"><strong>DidNavigateToPage</strong></a>(self, page, tab)</dt><dd><tt>Override&nbsp;to&nbsp;do&nbsp;operations&nbsp;right&nbsp;after&nbsp;the&nbsp;page&nbsp;is&nbsp;navigated&nbsp;and&nbsp;after<br>
all&nbsp;waiting&nbsp;for&nbsp;completion&nbsp;has&nbsp;occurred.</tt></dd></dl>

<dl><dt><a name="PageTest-DidRunPage"><strong>DidRunPage</strong></a>(self, platform)</dt><dd><tt>Called&nbsp;after&nbsp;the&nbsp;test&nbsp;run&nbsp;method&nbsp;was&nbsp;run,&nbsp;even&nbsp;if&nbsp;it&nbsp;failed.</tt></dd></dl>

<dl><dt><a name="PageTest-DidStartBrowser"><strong>DidStartBrowser</strong></a>(self, browser)</dt><dd><tt>Override&nbsp;to&nbsp;customize&nbsp;the&nbsp;browser&nbsp;right&nbsp;after&nbsp;it&nbsp;has&nbsp;launched.</tt></dd></dl>

<dl><dt><a name="PageTest-RestartBrowserBeforeEachPage"><strong>RestartBrowserBeforeEachPage</strong></a>(self)</dt><dd><tt>Should&nbsp;the&nbsp;browser&nbsp;be&nbsp;restarted&nbsp;for&nbsp;the&nbsp;page?<br>
&nbsp;<br>
This&nbsp;returns&nbsp;true&nbsp;if&nbsp;the&nbsp;test&nbsp;needs&nbsp;to&nbsp;unconditionally&nbsp;restart&nbsp;the<br>
browser&nbsp;for&nbsp;each&nbsp;page.&nbsp;It&nbsp;may&nbsp;be&nbsp;called&nbsp;before&nbsp;the&nbsp;browser&nbsp;is&nbsp;started.</tt></dd></dl>

<dl><dt><a name="PageTest-RunNavigateSteps"><strong>RunNavigateSteps</strong></a>(self, page, tab)</dt><dd><tt>Navigates&nbsp;the&nbsp;tab&nbsp;to&nbsp;the&nbsp;page&nbsp;URL&nbsp;attribute.<br>
&nbsp;<br>
Runs&nbsp;the&nbsp;'navigate_steps'&nbsp;page&nbsp;attribute&nbsp;as&nbsp;a&nbsp;compound&nbsp;action.</tt></dd></dl>

<dl><dt><a name="PageTest-SetOptions"><strong>SetOptions</strong></a>(self, options)</dt><dd><tt>Sets&nbsp;the&nbsp;BrowserFinderOptions&nbsp;instance&nbsp;to&nbsp;use.</tt></dd></dl>

<dl><dt><a name="PageTest-StopBrowserAfterPage"><strong>StopBrowserAfterPage</strong></a>(self, browser, page)</dt><dd><tt>Should&nbsp;the&nbsp;browser&nbsp;be&nbsp;stopped&nbsp;after&nbsp;the&nbsp;page&nbsp;is&nbsp;run?<br>
&nbsp;<br>
This&nbsp;is&nbsp;called&nbsp;after&nbsp;a&nbsp;page&nbsp;is&nbsp;run&nbsp;to&nbsp;decide&nbsp;whether&nbsp;the&nbsp;browser&nbsp;needs&nbsp;to<br>
be&nbsp;stopped&nbsp;to&nbsp;clean&nbsp;up&nbsp;its&nbsp;state.&nbsp;If&nbsp;it&nbsp;is&nbsp;stopped,&nbsp;then&nbsp;it&nbsp;will&nbsp;be<br>
restarted&nbsp;to&nbsp;run&nbsp;the&nbsp;next&nbsp;page.<br>
&nbsp;<br>
A&nbsp;test&nbsp;that&nbsp;overrides&nbsp;this&nbsp;can&nbsp;look&nbsp;at&nbsp;both&nbsp;the&nbsp;page&nbsp;and&nbsp;the&nbsp;browser&nbsp;to<br>
decide&nbsp;whether&nbsp;it&nbsp;needs&nbsp;to&nbsp;stop&nbsp;the&nbsp;browser.</tt></dd></dl>

<dl><dt><a name="PageTest-TabForPage"><strong>TabForPage</strong></a>(self, page, browser)</dt><dd><tt>Override&nbsp;to&nbsp;select&nbsp;a&nbsp;different&nbsp;tab&nbsp;for&nbsp;the&nbsp;page.&nbsp;&nbsp;For&nbsp;instance,&nbsp;to<br>
create&nbsp;a&nbsp;new&nbsp;tab&nbsp;for&nbsp;every&nbsp;page,&nbsp;return&nbsp;browser.tabs.New().</tt></dd></dl>

<dl><dt><a name="PageTest-ValidateAndMeasurePage"><strong>ValidateAndMeasurePage</strong></a>(self, page, tab, results)</dt><dd><tt>Override&nbsp;to&nbsp;check&nbsp;test&nbsp;assertions&nbsp;and&nbsp;perform&nbsp;measurement.<br>
&nbsp;<br>
When&nbsp;adding&nbsp;measurement&nbsp;results,&nbsp;call&nbsp;results.AddValue(...)&nbsp;for<br>
each&nbsp;result.&nbsp;Raise&nbsp;an&nbsp;exception&nbsp;or&nbsp;add&nbsp;a&nbsp;failure.FailureValue&nbsp;on<br>
failure.&nbsp;page_test.py&nbsp;also&nbsp;provides&nbsp;several&nbsp;base&nbsp;exception&nbsp;classes<br>
to&nbsp;use.<br>
&nbsp;<br>
Prefer&nbsp;metric&nbsp;value&nbsp;names&nbsp;that&nbsp;are&nbsp;in&nbsp;accordance&nbsp;with&nbsp;python<br>
variable&nbsp;style.&nbsp;e.g.,&nbsp;metric_name.&nbsp;The&nbsp;name&nbsp;'url'&nbsp;must&nbsp;not&nbsp;be&nbsp;used.<br>
&nbsp;<br>
Put&nbsp;together:<br>
&nbsp;&nbsp;def&nbsp;<a href="#PageTest-ValidateAndMeasurePage">ValidateAndMeasurePage</a>(self,&nbsp;page,&nbsp;tab,&nbsp;results):<br>
&nbsp;&nbsp;&nbsp;&nbsp;res&nbsp;=&nbsp;tab.EvaluateJavaScript('2+2')<br>
&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;res&nbsp;!=&nbsp;4:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;raise&nbsp;<a href="exceptions.html#Exception">Exception</a>('Oh,&nbsp;wow.')<br>
&nbsp;&nbsp;&nbsp;&nbsp;results.AddValue(scalar.ScalarValue(<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;page,&nbsp;'two_plus_two',&nbsp;'count',&nbsp;res))<br>
&nbsp;<br>
Args:<br>
&nbsp;&nbsp;page:&nbsp;A&nbsp;telemetry.page.Page&nbsp;instance.<br>
&nbsp;&nbsp;tab:&nbsp;A&nbsp;telemetry.core.Tab&nbsp;instance.<br>
&nbsp;&nbsp;results:&nbsp;A&nbsp;telemetry.results.PageTestResults&nbsp;instance.</tt></dd></dl>

<dl><dt><a name="PageTest-WillNavigateToPage"><strong>WillNavigateToPage</strong></a>(self, page, tab)</dt><dd><tt>Override&nbsp;to&nbsp;do&nbsp;operations&nbsp;before&nbsp;the&nbsp;page&nbsp;is&nbsp;navigated,&nbsp;notably&nbsp;Telemetry<br>
will&nbsp;already&nbsp;have&nbsp;performed&nbsp;the&nbsp;following&nbsp;operations&nbsp;on&nbsp;the&nbsp;browser&nbsp;before<br>
calling&nbsp;this&nbsp;function:<br>
*&nbsp;Ensure&nbsp;only&nbsp;one&nbsp;tab&nbsp;is&nbsp;open.<br>
*&nbsp;Call&nbsp;WaitForDocumentReadyStateToComplete&nbsp;on&nbsp;the&nbsp;tab.</tt></dd></dl>

<dl><dt><a name="PageTest-WillStartBrowser"><strong>WillStartBrowser</strong></a>(self, platform)</dt><dd><tt>Override&nbsp;to&nbsp;manipulate&nbsp;the&nbsp;browser&nbsp;environment&nbsp;before&nbsp;it&nbsp;launches.</tt></dd></dl>

<dl><dt><a name="PageTest-__init__"><strong>__init__</strong></a>(self, needs_browser_restart_after_each_page<font color="#909090">=False</font>, clear_cache_before_each_run<font color="#909090">=False</font>)</dt></dl>

<hr>
Data descriptors defined here:<br>
<dl><dt><strong>__dict__</strong></dt>
<dd><tt>dictionary&nbsp;for&nbsp;instance&nbsp;variables&nbsp;(if&nbsp;defined)</tt></dd>
</dl>
<dl><dt><strong>__weakref__</strong></dt>
<dd><tt>list&nbsp;of&nbsp;weak&nbsp;references&nbsp;to&nbsp;the&nbsp;object&nbsp;(if&nbsp;defined)</tt></dd>
</dl>
<dl><dt><strong>clear_cache_before_each_run</strong></dt>
<dd><tt>When&nbsp;set&nbsp;to&nbsp;True,&nbsp;the&nbsp;browser's&nbsp;disk&nbsp;and&nbsp;memory&nbsp;cache&nbsp;will&nbsp;be&nbsp;cleared<br>
before&nbsp;each&nbsp;run.</tt></dd>
</dl>
<dl><dt><strong>close_tabs_before_run</strong></dt>
<dd><tt>When&nbsp;set&nbsp;to&nbsp;True,&nbsp;all&nbsp;tabs&nbsp;are&nbsp;closed&nbsp;before&nbsp;running&nbsp;the&nbsp;test&nbsp;for&nbsp;the<br>
first&nbsp;time.</tt></dd>
</dl>
<dl><dt><strong>is_multi_tab_test</strong></dt>
<dd><tt>Returns&nbsp;True&nbsp;if&nbsp;the&nbsp;test&nbsp;opens&nbsp;multiple&nbsp;tabs.<br>
&nbsp;<br>
If&nbsp;the&nbsp;test&nbsp;overrides&nbsp;TabForPage,&nbsp;it&nbsp;is&nbsp;deemed&nbsp;a&nbsp;multi-tab&nbsp;test.<br>
Multi-tab&nbsp;tests&nbsp;do&nbsp;not&nbsp;retry&nbsp;after&nbsp;tab&nbsp;or&nbsp;browser&nbsp;crashes,&nbsp;whereas,<br>
single-tab&nbsp;tests&nbsp;too.&nbsp;That&nbsp;is&nbsp;because&nbsp;the&nbsp;state&nbsp;of&nbsp;multi-tab&nbsp;tests<br>
(e.g.,&nbsp;how&nbsp;many&nbsp;tabs&nbsp;are&nbsp;open,&nbsp;etc.)&nbsp;is&nbsp;unknown&nbsp;after&nbsp;crashes.</tt></dd>
</dl>
</td></tr></table> <p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ffc8d8">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#000000" face="helvetica, arial"><a name="TestNotSupportedOnPlatformError">class <strong>TestNotSupportedOnPlatformError</strong></a>(<a href="exceptions.html#Exception">exceptions.Exception</a>)</font></td></tr>
    
<tr bgcolor="#ffc8d8"><td rowspan=2><tt>&nbsp;&nbsp;&nbsp;</tt></td>
<td colspan=2><tt><a href="#PageTest">PageTest</a>&nbsp;<a href="exceptions.html#Exception">Exception</a>&nbsp;raised&nbsp;when&nbsp;a&nbsp;required&nbsp;feature&nbsp;is&nbsp;unavailable.<br>
&nbsp;<br>
The&nbsp;feature&nbsp;required&nbsp;to&nbsp;run&nbsp;the&nbsp;test&nbsp;could&nbsp;be&nbsp;part&nbsp;of&nbsp;the&nbsp;platform,<br>
hardware&nbsp;configuration,&nbsp;or&nbsp;browser.<br>&nbsp;</tt></td></tr>
<tr><td>&nbsp;</td>
<td width="100%"><dl><dt>Method resolution order:</dt>
<dd><a href="telemetry.page.page_test.html#TestNotSupportedOnPlatformError">TestNotSupportedOnPlatformError</a></dd>
<dd><a href="exceptions.html#Exception">exceptions.Exception</a></dd>
<dd><a href="exceptions.html#BaseException">exceptions.BaseException</a></dd>
<dd><a href="__builtin__.html#object">__builtin__.object</a></dd>
</dl>
<hr>
Data descriptors defined here:<br>
<dl><dt><strong>__weakref__</strong></dt>
<dd><tt>list&nbsp;of&nbsp;weak&nbsp;references&nbsp;to&nbsp;the&nbsp;object&nbsp;(if&nbsp;defined)</tt></dd>
</dl>
<hr>
Methods inherited from <a href="exceptions.html#Exception">exceptions.Exception</a>:<br>
<dl><dt><a name="TestNotSupportedOnPlatformError-__init__"><strong>__init__</strong></a>(...)</dt><dd><tt>x.<a href="#TestNotSupportedOnPlatformError-__init__">__init__</a>(...)&nbsp;initializes&nbsp;x;&nbsp;see&nbsp;help(type(x))&nbsp;for&nbsp;signature</tt></dd></dl>

<hr>
Data and other attributes inherited from <a href="exceptions.html#Exception">exceptions.Exception</a>:<br>
<dl><dt><strong>__new__</strong> = &lt;built-in method __new__ of type object&gt;<dd><tt>T.<a href="#TestNotSupportedOnPlatformError-__new__">__new__</a>(S,&nbsp;...)&nbsp;-&gt;&nbsp;a&nbsp;new&nbsp;<a href="__builtin__.html#object">object</a>&nbsp;with&nbsp;type&nbsp;S,&nbsp;a&nbsp;subtype&nbsp;of&nbsp;T</tt></dl>

<hr>
Methods inherited from <a href="exceptions.html#BaseException">exceptions.BaseException</a>:<br>
<dl><dt><a name="TestNotSupportedOnPlatformError-__delattr__"><strong>__delattr__</strong></a>(...)</dt><dd><tt>x.<a href="#TestNotSupportedOnPlatformError-__delattr__">__delattr__</a>('name')&nbsp;&lt;==&gt;&nbsp;del&nbsp;x.name</tt></dd></dl>

<dl><dt><a name="TestNotSupportedOnPlatformError-__getattribute__"><strong>__getattribute__</strong></a>(...)</dt><dd><tt>x.<a href="#TestNotSupportedOnPlatformError-__getattribute__">__getattribute__</a>('name')&nbsp;&lt;==&gt;&nbsp;x.name</tt></dd></dl>

<dl><dt><a name="TestNotSupportedOnPlatformError-__getitem__"><strong>__getitem__</strong></a>(...)</dt><dd><tt>x.<a href="#TestNotSupportedOnPlatformError-__getitem__">__getitem__</a>(y)&nbsp;&lt;==&gt;&nbsp;x[y]</tt></dd></dl>

<dl><dt><a name="TestNotSupportedOnPlatformError-__getslice__"><strong>__getslice__</strong></a>(...)</dt><dd><tt>x.<a href="#TestNotSupportedOnPlatformError-__getslice__">__getslice__</a>(i,&nbsp;j)&nbsp;&lt;==&gt;&nbsp;x[i:j]<br>
&nbsp;<br>
Use&nbsp;of&nbsp;negative&nbsp;indices&nbsp;is&nbsp;not&nbsp;supported.</tt></dd></dl>

<dl><dt><a name="TestNotSupportedOnPlatformError-__reduce__"><strong>__reduce__</strong></a>(...)</dt></dl>

<dl><dt><a name="TestNotSupportedOnPlatformError-__repr__"><strong>__repr__</strong></a>(...)</dt><dd><tt>x.<a href="#TestNotSupportedOnPlatformError-__repr__">__repr__</a>()&nbsp;&lt;==&gt;&nbsp;repr(x)</tt></dd></dl>

<dl><dt><a name="TestNotSupportedOnPlatformError-__setattr__"><strong>__setattr__</strong></a>(...)</dt><dd><tt>x.<a href="#TestNotSupportedOnPlatformError-__setattr__">__setattr__</a>('name',&nbsp;value)&nbsp;&lt;==&gt;&nbsp;x.name&nbsp;=&nbsp;value</tt></dd></dl>

<dl><dt><a name="TestNotSupportedOnPlatformError-__setstate__"><strong>__setstate__</strong></a>(...)</dt></dl>

<dl><dt><a name="TestNotSupportedOnPlatformError-__str__"><strong>__str__</strong></a>(...)</dt><dd><tt>x.<a href="#TestNotSupportedOnPlatformError-__str__">__str__</a>()&nbsp;&lt;==&gt;&nbsp;str(x)</tt></dd></dl>

<dl><dt><a name="TestNotSupportedOnPlatformError-__unicode__"><strong>__unicode__</strong></a>(...)</dt></dl>

<hr>
Data descriptors inherited from <a href="exceptions.html#BaseException">exceptions.BaseException</a>:<br>
<dl><dt><strong>__dict__</strong></dt>
</dl>
<dl><dt><strong>args</strong></dt>
</dl>
<dl><dt><strong>message</strong></dt>
</dl>
</td></tr></table></td></tr></table>
</body></html>