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<title>5.5 test.test_support -- Utility functions for tests</title>
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<H1><A NAME="SECTION007500000000000000000">
5.5 <tt class="module">test.test_support</tt> --
         Utility functions for tests</A>
</H1>

<P>
<A NAME="module-test.testsupport"></A>

<P>
The <tt class="module">test.test_support</tt> module provides support for Python's
regression tests.

<P>
This module defines the following exceptions:

<P>
<dl><dt><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-1181' xml:id='l2h-1181' class="exception">TestFailed</tt></b></dt>
<dd>
Exception to be raised when a test fails.
</dd></dl>

<P>
<dl><dt><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-1182' xml:id='l2h-1182' class="exception">TestSkipped</tt></b></dt>
<dd>
Subclass of <tt class="exception">TestFailed</tt>.
Raised when a test is skipped.
This occurs when a needed resource (such as a network connection) is not
available at the time of testing.
</dd></dl>

<P>
<dl><dt><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-1183' xml:id='l2h-1183' class="exception">ResourceDenied</tt></b></dt>
<dd>
Subclass of <tt class="exception">TestSkipped</tt>.
Raised when a resource (such as a network connection) is not available.
Raised by the <tt class="function">requires()</tt> function.
</dd></dl>

<P>
The <tt class="module">test.test_support</tt> module defines the following constants:

<P>
<dl><dt><b><tt id='l2h-1184' xml:id='l2h-1184'>verbose</tt></b></dt>
<dd>
<tt class="constant">True</tt> when verbose output is enabled.
Should be checked when more detailed information is desired about a running
test.
<var>verbose</var> is set by <tt class="module">test.regrtest</tt>.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-1185' xml:id='l2h-1185'>have_unicode</tt></b></dt>
<dd>
<tt class="constant">True</tt> when Unicode support is available.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-1186' xml:id='l2h-1186'>is_jython</tt></b></dt>
<dd>
<tt class="constant">True</tt> if the running interpreter is Jython.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-1187' xml:id='l2h-1187'>TESTFN</tt></b></dt>
<dd>
Set to the path that a temporary file may be created at.
Any temporary that is created should be closed and unlinked (removed).
</dd></dl>

<P>
The <tt class="module">test.test_support</tt> module defines the following functions:

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1188' xml:id='l2h-1188' class="function">forget</tt></b>(</nobr></td>
  <td><var>module_name</var>)</td></tr></table></dt>
<dd>
Removes the module named <var>module_name</var> from <code>sys.modules</code> and deletes
any byte-compiled files of the module.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1189' xml:id='l2h-1189' class="function">is_resource_enabled</tt></b>(</nobr></td>
  <td><var>resource</var>)</td></tr></table></dt>
<dd>
Returns <tt class="constant">True</tt> if <var>resource</var> is enabled and available.
The list of available resources is only set when <tt class="module">test.regrtest</tt>
is executing the tests.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1190' xml:id='l2h-1190' class="function">requires</tt></b>(</nobr></td>
  <td><var>resource</var><big>[</big><var>, msg</var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
Raises <tt class="exception">ResourceDenied</tt> if <var>resource</var> is not available.
<var>msg</var> is the argument to <tt class="exception">ResourceDenied</tt> if it is raised.
Always returns true if called by a function whose <code>__name__</code> is
<code>'__main__'</code>.
Used when tests are executed by <tt class="module">test.regrtest</tt>.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1191' xml:id='l2h-1191' class="function">findfile</tt></b>(</nobr></td>
  <td><var>filename</var>)</td></tr></table></dt>
<dd>
Return the path to the file named <var>filename</var>.
If no match is found <var>filename</var> is returned.
This does not equal a failure since it could be the path to the file.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1192' xml:id='l2h-1192' class="function">run_unittest</tt></b>(</nobr></td>
  <td><var>*classes</var>)</td></tr></table></dt>
<dd>
Execute <tt class="class">unittest.TestCase</tt> subclasses passed to the function.
The function scans the classes for methods starting with the prefix
"<tt class="samp">test_</tt>" and executes the tests individually.
This is the preferred way to execute tests.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1193' xml:id='l2h-1193' class="function">run_suite</tt></b>(</nobr></td>
  <td><var>suite</var><big>[</big><var>, testclass</var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
Execute the <tt class="class">unittest.TestSuite</tt> instance <var>suite</var>.
The optional argument <var>testclass</var> accepts one of the test classes in the
suite so as to print out more detailed information on where the testing suite
originated from.
</dl>

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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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