123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152 |
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
- <title>Fixtures</title>
- <link rel="stylesheet" href="../../boostbook.css" type="text/css">
- <meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
- <link rel="home" href="../../index.html" title="Boost.Test">
- <link rel="up" href="../tests_organization.html" title="Declaring and organizing tests">
- <link rel="prev" href="decorators/explicit_decorator_declaration.html" title="Explicit decorator declaration">
- <link rel="next" href="fixtures/models.html" title="Fixture models">
- </head>
- <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
- <table cellpadding="2" width="100%"><tr>
- <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td>
- <td align="center"><a href="../../../../../../index.html">Home</a></td>
- <td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td>
- <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
- <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
- <td align="center"><a href="../../../../../../more/index.htm">More</a></td>
- </tr></table>
- <hr>
- <div class="spirit-nav">
- <a accesskey="p" href="decorators/explicit_decorator_declaration.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../tests_organization.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="fixtures/models.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h3 class="title">
- <a name="boost_test.tests_organization.fixtures"></a><a class="link" href="fixtures.html" title="Fixtures">Fixtures</a>
- </h3></div></div></div>
- <div class="toc"><dl class="toc">
- <dt><span class="section"><a href="fixtures/models.html">Fixture
- models</a></span></dt>
- <dt><span class="section"><a href="fixtures/case.html">Test case
- fixture</a></span></dt>
- <dt><span class="section"><a href="fixtures/per_test_suite_fixture.html">Test
- suite entry/exit fixture</a></span></dt>
- <dt><span class="section"><a href="fixtures/global.html">Global
- fixture</a></span></dt>
- </dl></div>
- <p>
- In general terms a test fixture or test context is the collection of one
- or more of the following items, required to perform the test:
- </p>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem">
- preconditions
- </li>
- <li class="listitem">
- particular states of tested units
- </li>
- <li class="listitem">
- necessary cleanup procedures
- </li>
- </ul></div>
- <p>
- Though these tasks are encountered in many if not all test cases, what makes
- a test fixture different is repetition. Where a normal test case implementation
- does all preparatory and cleanup work itself, a test fixture allows it to
- be implemented in a separate reusable unit.
- </p>
- <p>
- With introduction of e<span class="bold"><strong>X</strong></span>treme <span class="bold"><strong>P</strong></span>rogramming
- (XP), the testing style, that require test setup/cleanup repetition, has
- become even more popular. Single XP adopted test modules may contain hundreds
- of single assertion test cases, many requiring very similar test setup/cleanup.
- This is the problem that the test fixture is designed to solve.
- </p>
- <p>
- In practice a test fixture usually is a combination of <code class="computeroutput"><span class="identifier">setup</span></code>
- and <code class="computeroutput"><span class="identifier">teardown</span></code> functions, associated
- with test case. The former serves the purposes of test setup. The later is
- dedicated to the cleanup tasks. Ideally we'd like for a test module author
- to be able to define variables used in fixtures on the stack and, at the
- same time, to refer to them directly in a test case.
- </p>
- <p>
- It's important to understand that C++ provides a way to implement a straightforward
- test fixture solution that almost satisfies our requirements without any
- extra support from the test framework. Here is how simple test module with
- such a fixture may look like:
- </p>
- <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">MyFixture</span> <span class="special">{</span>
- <span class="identifier">MyFixture</span><span class="special">()</span> <span class="special">{</span> <span class="identifier">i</span> <span class="special">=</span> <span class="keyword">new</span> <span class="keyword">int</span><span class="special">;</span> <span class="special">*</span><span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span> <span class="special">}</span>
- <span class="special">~</span><span class="identifier">MyFixture</span><span class="special">()</span> <span class="special">{</span> <span class="keyword">delete</span> <span class="identifier">i</span><span class="special">;</span> <span class="special">}</span>
- <span class="keyword">int</span><span class="special">*</span> <span class="identifier">i</span><span class="special">;</span>
- <span class="special">};</span>
- <a class="link" href="../utf_reference/test_org_reference/test_org_boost_auto_test_case.html" title="BOOST_AUTO_TEST_CASE"><code class="computeroutput"><span class="identifier">BOOST_AUTO_TEST_CASE</span></code></a><span class="special">(</span> <span class="identifier">test_case1</span> <span class="special">)</span>
- <span class="special">{</span>
- <span class="identifier">MyFixture</span> <span class="identifier">f</span><span class="special">;</span>
- <span class="comment">// do something involving f.i</span>
- <span class="special">}</span>
- <a class="link" href="../utf_reference/test_org_reference/test_org_boost_auto_test_case.html" title="BOOST_AUTO_TEST_CASE"><code class="computeroutput"><span class="identifier">BOOST_AUTO_TEST_CASE</span></code></a><span class="special">(</span> <span class="identifier">test_case2</span> <span class="special">)</span>
- <span class="special">{</span>
- <span class="identifier">MyFixture</span> <span class="identifier">f</span><span class="special">;</span>
- <span class="comment">// do something involving f.i</span>
- <span class="special">}</span>
- </pre>
- <p>
- This is a generic solution that can be used to implement any kind of shared
- setup or cleanup procedure. Still there are several more or less minor practical
- issues with this pure C++ based fixtures solution:
- </p>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem">
- We need to add a fixture declaration statement into each test case manually.
- </li>
- <li class="listitem">
- Objects defined in fixture are references with <code class="computeroutput"><span class="special"><</span><span class="identifier">fixture</span><span class="special">-</span><span class="identifier">instance</span><span class="special">-</span><span class="identifier">name</span><span class="special">></span></code>
- prefix.
- </li>
- <li class="listitem">
- There is no place to execute a <span class="emphasis"><em>global</em></span> fixture, which
- performs <span class="emphasis"><em>global</em></span> setup/cleanup procedures before
- and after testing.
- </li>
- </ul></div>
- <p>
- The <span class="emphasis"><em>Unit Test Framework</em></span> lets you define a fixture according
- to <a class="link" href="fixtures/models.html" title="Fixture models">several
- generic interfaces</a>, and thus helps you with following tasks:
- </p>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem">
- define shared setup/teardown procedures for a single or group of test
- cases
- </li>
- <li class="listitem">
- define setup/teardown procedures which are performed once per test suite
- </li>
- <li class="listitem">
- define <a class="link" href="fixtures/global.html" title="Global fixture">global
- setup/teardown</a> procedures which are performed once per test module
- </li>
- </ul></div>
- </div>
- <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
- <td align="left"></td>
- <td align="right"><div class="copyright-footer">Copyright © 2001-2019 Boost.Test
- contributors<p>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
- </p>
- </div></td>
- </tr></table>
- <hr>
- <div class="spirit-nav">
- <a accesskey="p" href="decorators/explicit_decorator_declaration.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../tests_organization.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="fixtures/models.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
- </div>
- </body>
- </html>
|