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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<html>
+<head>
+<title>JSCoverage - FAQ</title>
+<link rel="stylesheet" type="text/css" href="reset-fonts-grids.css">
+<link rel="stylesheet" type="text/css" href="style.css">
+</head>
+<body>
+<div id="doc3" class="yui-t5">
+ <div id="hd"><h1><a href="./">JSCoverage</a><br><span class="tag">code coverage for JavaScript</span></h1></div>
+ <div id="bd">
+ <div id="yui-main">
+ <div id="jscoverage-main" class="yui-b">
+ <h2><abbr title="Frequently Asked Questions">FAQ</abbr></h2>
+
+ <h3>Can I use JSCoverage to measure code coverage for a page on <code>http://example.com/</code>?</h3>
+
+ <p>
+ In order to measure the code coverage of a page on <code>http://example.com/</code>,
+ you must run <code>jscoverage</code> to create a <code>jscoverage.html</code> file on the
+ <code>example.com</code> server. You cannot use <code>http://example.org/jscoverage.html</code>
+ to measure the code coverage of a page located on <code>http://example.com/</code>.
+ </p>
+
+ <p>
+ The fundamental reason for this limitation is the
+ <a href="http://www.mozilla.org/projects/security/components/same-origin.html">Same Origin Policy</a>
+ for untrusted JavaScript.
+ </p>
+
+ <p>
+ (In fact, the current version of JSCoverage is slightly more restrictive
+ than this: it requires that the JavaScript being measured reside under the
+ same <strong>directory</strong> as the <code>jscoverage.html</code> file.)
+ </p>
+
+ <h3>Why doesn't my test suite run under JSCoverage in Firefox 3?</h3>
+
+ <p>
+ Firefox 3 introduces <a
+ href="http://tech.groups.yahoo.com/group/jsunit/message/1075">new
+ security restrictions</a> on local files. Depending on the way your
+ test suite is organized, this may cause problems for JSCoverage.
+ (You may get the error "uncaught exception: Permission denied to get property Window._$jscoverage".)
+ There are several workarounds:
+ </p>
+
+ <ul class="list">
+ <li><p>Place your files on a web server instead of loading them from the file system.
+ This is usually the simplest solution.</p>
+ <li><p>Organize your HTML files in your test suite in a flat directory structure. For example, suppose that
+ you instrument your test suite with this command:</p>
+<pre>
+jscoverage src instrumented
+</pre>
+ <p>If all your HTML files are located directly under the <code>src/</code> directory (i.e., not in a
+ subdirectory of <code>src/</code>), then you should not have any problems using Firefox 3.</p>
+ <li><p>Set the <a href="http://kb.mozillazine.org/Editing_configuration">Firefox preference</a> named
+ <code><a href="http://kb.mozillazine.org/Security.fileuri.origin_policy">security.fileuri.origin_policy</a></code>
+ to 3.</p>
+ </ul>
+
+ <h3>I'm trying to load my code with the URL
+ <code>file:///C:/foo/bar/jscoverage.html?foo/bar.html</code>
+ and I'm getting all kinds of JavaScript errors.</h3>
+
+ <p>
+ Internet Explorer 6 seems to have problems with a <code>file:</code> URL
+ that has a query string with a slash in it.
+ </p>
+ <p>
+ As a workaround:
+ </p>
+ <ul class="list">
+ <li><p>Place your files on a web server instead of loading them from the file system.
+ (<code>http:</code> URLs work fine.)</p>
+ <li><p>Do not use a query string; enter your URL in the "URL" field in the "Browser" tab.</p>
+ <li><p>Rearrange your directory structure so that <code>bar.html</code>
+ ends up in the same directory as <code>jscoverage.html</code>; then
+ you can use the URL
+ <code>file:///C:/foo/bar/jscoverage.html?bar.html</code>
+ with no slash in the query string.</p>
+ <li><p>Use a different browser. (IE 7 seems to work.)</p>
+ </ul>
+
+ <h3>JSCoverage changes my cursor to a busy cursor, and it never changes back!</h3>
+
+ <p>
+ Certain browsers (<i>e. g</i>., Internet Explorer 6, Opera, Safari) have trouble changing
+ the cursor. Try moving the mouse and your cursor should change back to normal.
+ </p>
+
+ <p>
+ See <a href="http://groups.google.com/group/Google-Web-Toolkit/browse_thread/thread/631908bd63241136/783c307480f95d8c">this discussion</a> for more information.
+ </p>
+
+ <h3>JSCoverage hangs sometimes when rendering the coverage report.</h3>
+
+ <p>
+ With Internet Explorer 6 (I think I see a pattern here), garbage collection can cause performance problems.
+ (More information <a href="http://ajaxian.com/archives/garbage-collection-in-ie6">here</a>.)
+ </p>
+
+ <h3 id="jsunit">Can JSCoverage be used with <a href="http://www.jsunit.net/">JsUnit</a>?</h3>
+
+ <p>
+ It is necessary to run JSCoverage in <dfn>inverted mode</dfn>. You will have to
+ modify JsUnit to launch JSCoverage.
+ </p>
+
+ <p>
+ See the directory <code>doc/example-jsunit</code> for an example. It
+ contains a copy of JsUnit version 2.2alpha11, with the file
+ <code>jsunit/app/main-data.html</code> slightly modified to add a button
+ which launches JSCoverage. It also contains a simple unit test file <code>test.html</code>. You
+ can instrument this example as follows:
+ </p>
+
+<pre>
+jscoverage --no-instrument=jsunit doc/example-jsunit doc/instrumented-jsunit
+</pre>
+
+ <p>
+ You can then run the <code>test.html</code> file in JsUnit's <code>jsunit/testRunner.html</code>.
+ The simplest way to do this is probably to copy the contents of <code>doc/instrumented-jsunit</code>
+ to the root of a web server and then access the URL
+ </p>
+
+<pre>
+http://127.0.0.1/jsunit/testRunner.html?testPage=http://127.0.0.1/test.html&amp;autoRun=true
+</pre>
+
+ <p>
+ After the test suite has been run, click on the "Coverage report" button
+ to get a coverage report.
+ </p>
+
+ </div>
+ </div>
+ <div id="jscoverage-sidebar" class="yui-b">
+ <ul>
+ <li><a href="./">Home</a>
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+ <li><a href="manual.html">Documentation</a>
+ <li><a href="demo.html">Demo</a>
+ <li><a href="http://siliconforks.com/jscoverage/download.html">Download</a>
+ <li>FAQ
+ <li><a href="help.html">Help</a>
+ <li><a href="license.html">License</a>
+ <li><a href="links.html">Links</a>
+ <li><a href="users.html">Users</a>
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+ </ul>
+ </div>
+ </div>
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+ <address>
+ Copyright &copy; 2007, 2008 <a href="http://siliconforks.com/"><img src="siliconforks-16x16.png" width="16" height="16" class="icon" alt="Silicon Forks"></a> <a href="http://siliconforks.com/">siliconforks.com</a><br>
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