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3 <head>
4 <title>JSCoverage - FAQ</title>
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8 <body>
9 <div id="doc3" class="yui-t5">
10 <div id="hd"><h1><a href="./">JSCoverage</a><br><span class="tag">code coverage for JavaScript</span></h1></div>
11 <div id="bd">
12 <div id="yui-main">
13 <div id="jscoverage-main" class="yui-b">
14 <h2><abbr title="Frequently Asked Questions">FAQ</abbr></h2>
16 <h3>Can I use JSCoverage to measure code coverage for a page on <code>http://example.com/</code>?</h3>
18 <p>
19 In order to measure the code coverage of a page on <code>http://example.com/</code>,
20 you must run <code>jscoverage</code> to create a <code>jscoverage.html</code> file on the
21 <code>example.com</code> server. You cannot use <code>http://example.org/jscoverage.html</code>
22 to measure the code coverage of a page located on <code>http://example.com/</code>.
23 </p>
25 <p>
26 The fundamental reason for this limitation is the
27 <a href="http://www.mozilla.org/projects/security/components/same-origin.html">Same Origin Policy</a>
28 for untrusted JavaScript.
29 </p>
31 <p>
32 (In fact, the current version of JSCoverage is slightly more restrictive
33 than this: it requires that the JavaScript being measured reside under the
34 same <strong>directory</strong> as the <code>jscoverage.html</code> file.)
35 </p>
37 <h3>Why doesn't my test suite run under JSCoverage in Firefox 3?</h3>
39 <p>
40 Firefox 3 introduces <a
41 href="http://tech.groups.yahoo.com/group/jsunit/message/1075">new
42 security restrictions</a> on local files. Depending on the way your
43 test suite is organized, this may cause problems for JSCoverage.
44 (You may get the error "uncaught exception: Permission denied to get property Window._$jscoverage".)
45 There are several workarounds:
46 </p>
48 <ul class="list">
49 <li><p>Place your files on a web server instead of loading them from the file system.
50 This is usually the simplest solution.</p>
51 <li><p>Organize your HTML files in your test suite in a flat directory structure. For example, suppose that
52 you instrument your test suite with this command:</p>
53 <pre>
54 jscoverage src instrumented
55 </pre>
56 <p>If all your HTML files are located directly under the <code>src/</code> directory (i.e., not in a
57 subdirectory of <code>src/</code>), then you should not have any problems using Firefox 3.</p>
58 <li><p>Set the <a href="http://kb.mozillazine.org/Editing_configuration">Firefox preference</a> named
59 <code><a href="http://kb.mozillazine.org/Security.fileuri.origin_policy">security.fileuri.origin_policy</a></code>
60 to 3.</p>
61 </ul>
63 <h3>I'm trying to load my code with the URL
64 <code>file:///C:/foo/bar/jscoverage.html?foo/bar.html</code>
65 and I'm getting all kinds of JavaScript errors.</h3>
67 <p>
68 Internet Explorer 6 seems to have problems with a <code>file:</code> URL
69 that has a query string with a slash in it.
70 </p>
71 <p>
72 As a workaround:
73 </p>
74 <ul class="list">
75 <li><p>Place your files on a web server instead of loading them from the file system.
76 (<code>http:</code> URLs work fine.)</p>
77 <li><p>Do not use a query string; enter your URL in the "URL" field in the "Browser" tab.</p>
78 <li><p>Rearrange your directory structure so that <code>bar.html</code>
79 ends up in the same directory as <code>jscoverage.html</code>; then
80 you can use the URL
81 <code>file:///C:/foo/bar/jscoverage.html?bar.html</code>
82 with no slash in the query string.</p>
83 <li><p>Use a different browser. (IE 7 seems to work.)</p>
84 </ul>
86 <h3>JSCoverage changes my cursor to a busy cursor, and it never changes back!</h3>
88 <p>
89 Certain browsers (<i>e. g</i>., Internet Explorer 6, Opera, Safari) have trouble changing
90 the cursor. Try moving the mouse and your cursor should change back to normal.
91 </p>
93 <p>
94 See <a href="http://groups.google.com/group/Google-Web-Toolkit/browse_thread/thread/631908bd63241136/783c307480f95d8c">this discussion</a> for more information.
95 </p>
97 <h3>JSCoverage hangs sometimes when rendering the coverage report.</h3>
99 <p>
100 With Internet Explorer 6 (I think I see a pattern here), garbage collection can cause performance problems.
101 (More information <a href="http://ajaxian.com/archives/garbage-collection-in-ie6">here</a>.)
102 </p>
104 <h3 id="jsunit">Can JSCoverage be used with <a href="http://www.jsunit.net/">JsUnit</a>?</h3>
106 <p>
107 It is necessary to run JSCoverage in <dfn>inverted mode</dfn>. You will have to
108 modify JsUnit to launch JSCoverage.
109 </p>
111 <p>
112 See the directory <code>doc/example-jsunit</code> for an example. It
113 contains a copy of JsUnit version 2.2alpha11, with the file
114 <code>jsunit/app/main-data.html</code> slightly modified to add a button
115 which launches JSCoverage. It also contains a simple unit test file <code>test.html</code>. You
116 can instrument this example as follows:
117 </p>
119 <pre>
120 jscoverage --no-instrument=jsunit doc/example-jsunit doc/instrumented-jsunit
121 </pre>
123 <p>
124 You can then run the <code>test.html</code> file in JsUnit's <code>jsunit/testRunner.html</code>.
125 The simplest way to do this is probably to copy the contents of <code>doc/instrumented-jsunit</code>
126 to the root of a web server and then access the URL
127 </p>
129 <pre>
131 </pre>
133 <p>
134 After the test suite has been run, click on the "Coverage report" button
135 to get a coverage report.
136 </p>
138 <h3 id="ie-proxy">Does Internet Explorer work with <code>jscoverage-server --proxy</code>?</h3>
140 <p>
141 Internet Explorer <a href="http://www.fiddler2.com/fiddler/help/hookup.asp#Q-LocalTraffic">does
142 not use a proxy for URLs with host <code></code> or
143 <code>localhost</code></a>.
144 The proxy <em>will</em> be used if you use your machine's actual IP
145 address or host name.
146 For example, if your IP address is <code></code>, you can
147 access a URL like <code></code> in
148 Internet Explorer and it will work.
149 (Under Windows, you can get your machine's IP address with the <code>ipconfig</code> command.)
150 </p>
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