1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Test driven development with Boost.Test</title> 5<link rel="stylesheet" href="../../../boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../index.html" title="Boost.Test"> 8<link rel="up" href="../tutorials.html" title="Tutorials"> 9<link rel="prev" href="../tutorials.html" title="Tutorials"> 10<link rel="next" href="hello.html" title="A testing framework, what for?"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="../tutorials.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../tutorials.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="hello.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h4 class="title"> 27<a name="boost_test.practical_usage_recommendations.tutorials.bt_and_tdd"></a><a class="link" href="bt_and_tdd.html" title="Test driven development with Boost.Test">Test 28 driven development with Boost.Test</a> 29</h4></div></div></div> 30<p> 31 Today is a momentous day - first day of new year. Today I am going to start 32 a new life. I am going to stop eating a greasy food, start attending a 33 fitness club and ... today I am going to test programs I am writing. I 34 can start right after the last line of a program is completed or, even 35 better, I can write tests while I am coding. And maybe next time I will 36 write tests before the coding, during the design stage. I have read a lot 37 of literature on how to write the tests, I have the unit test framework 38 in hand and an idea of new class. So let's get started. 39 </p> 40<p> 41 Let say I want to encapsulate an unchangeable C character buffer with a 42 length into the simple class <code class="computeroutput"><span class="identifier">const_string</span></code>. 43 Rationale: a string class that does not allocate a memory and provide a 44 convenient read-only access to the pre-allocated character buffer. I will 45 probably want <code class="computeroutput"><span class="identifier">const_string</span></code> 46 to have an interface similar to the class std::string. What will I do first? 47 In my new life I will start with writing a test module for future class 48 <code class="computeroutput"><span class="identifier">const_string</span></code>. It will look 49 like this: 50 </p> 51<pre class="programlisting"><span class="preprocessor">#define</span> <a class="link" href="../../utf_reference/link_references/link_boost_test_module_macro.html" title="BOOST_TEST_MODULE"><code class="computeroutput"><span class="identifier">BOOST_TEST_MODULE</span></code></a> <span class="identifier">const_string</span> <span class="identifier">test</span> 52<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 53</pre> 54<p> 55 Now I can compile it and link with the unit test framework. Done! I have 56 a working test program. It is empty, so when I run the program it produces 57 following output: 58 </p> 59<pre class="programlisting"><span class="special">***</span> <span class="identifier">No</span> <span class="identifier">errors</span> <span class="identifier">detected</span></pre> 60<p> 61 Well, now it could be a good time to start a work on <code class="computeroutput"><span class="identifier">const_string</span></code>. 62 First thing I imagine would be good to have is a constructors and trivial 63 access methods. So my class initial version looks like this: 64 </p> 65<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">const_string</span> <span class="special">{</span> 66<span class="keyword">public</span><span class="special">:</span> 67 <span class="comment">// Constructors</span> 68 <span class="identifier">const_string</span><span class="special">();</span> 69 <span class="identifier">const_string</span><span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">s</span> <span class="special">)</span> 70 <span class="identifier">const_string</span><span class="special">(</span> <span class="keyword">char</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">s</span> <span class="special">);</span> 71 <span class="identifier">const_string</span><span class="special">(</span> <span class="keyword">char</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">length</span> <span class="special">);</span> 72 <span class="identifier">const_string</span><span class="special">(</span> <span class="keyword">char</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">begin</span><span class="special">,</span> <span class="keyword">char</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">end</span> <span class="special">);</span> 73 74 <span class="comment">// Access methods</span> 75 <span class="keyword">char</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">data</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span> 76 <span class="identifier">size_t</span> <span class="identifier">length</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span> 77 <span class="keyword">bool</span> <span class="identifier">is_empty</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span> 78 79 <span class="comment">// ...</span> 80<span class="special">};</span> 81</pre> 82<p> 83 Now I am able to write a first test case - constructors testing - and add 84 it to a test suite. My test program became to look like this: 85 </p> 86<pre class="programlisting"><span class="preprocessor">#define</span> <a class="link" href="../../utf_reference/link_references/link_boost_test_module_macro.html" title="BOOST_TEST_MODULE"><code class="computeroutput"><span class="identifier">BOOST_TEST_MODULE</span></code></a> <span class="identifier">const_string</span> <span class="identifier">test</span> 87<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 88 89<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">constructors_test</span> <span class="special">)</span> 90<span class="special">{</span> 91 <span class="identifier">const_string</span> <span class="identifier">cs0</span><span class="special">(</span> <span class="string">""</span> <span class="special">);</span> <span class="comment">// 1 //</span> 92 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">cs0</span><span class="special">.</span><span class="identifier">length</span><span class="special">()</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">size_t</span><span class="special">)</span><span class="number">0</span> <span class="special">);</span> 93 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">cs0</span><span class="special">.</span><span class="identifier">is_empty</span><span class="special">()</span> <span class="special">);</span> 94 95 <span class="identifier">const_string</span> <span class="identifier">cs01</span><span class="special">(</span> <span class="identifier">NULL</span> <span class="special">);</span> <span class="comment">// 2 //</span> 96 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">cs01</span><span class="special">.</span><span class="identifier">length</span><span class="special">()</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">size_t</span><span class="special">)</span><span class="number">0</span> <span class="special">);</span> 97 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">cs01</span><span class="special">.</span><span class="identifier">is_empty</span><span class="special">()</span> <span class="special">);</span> 98 99 <span class="identifier">const_string</span> <span class="identifier">cs1</span><span class="special">(</span> <span class="string">"test_string"</span> <span class="special">);</span> <span class="comment">// 3 //</span> 100 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">strcmp</span><span class="special">(</span> <span class="identifier">cs1</span><span class="special">.</span><span class="identifier">data</span><span class="special">(),</span> <span class="string">"test_string"</span> <span class="special">)</span> <span class="special">==</span> <span class="number">0</span> <span class="special">);</span> 101 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">cs1</span><span class="special">.</span><span class="identifier">length</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">strlen</span><span class="special">(</span><span class="string">"test_string"</span><span class="special">)</span> <span class="special">);</span> 102 103 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">s</span><span class="special">(</span> <span class="string">"test_string"</span> <span class="special">);</span> <span class="comment">// 4 //</span> 104 <span class="identifier">const_string</span> <span class="identifier">cs2</span><span class="special">(</span> <span class="identifier">s</span> <span class="special">);</span> 105 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">strcmp</span><span class="special">(</span> <span class="identifier">cs2</span><span class="special">.</span><span class="identifier">data</span><span class="special">(),</span> <span class="string">"test_string"</span> <span class="special">)</span> <span class="special">==</span> <span class="number">0</span> <span class="special">);</span> 106 107 <span class="identifier">const_string</span> <span class="identifier">cs3</span><span class="special">(</span> <span class="identifier">cs1</span> <span class="special">);</span> <span class="comment">// 5 //</span> 108 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">strcmp</span><span class="special">(</span> <span class="identifier">cs3</span><span class="special">.</span><span class="identifier">data</span><span class="special">(),</span> <span class="string">"test_string"</span> <span class="special">)</span> <span class="special">==</span> <span class="number">0</span> <span class="special">);</span> 109 110 <span class="identifier">const_string</span> <span class="identifier">cs4</span><span class="special">(</span> <span class="string">"test_string"</span><span class="special">,</span> <span class="number">4</span> <span class="special">);</span> <span class="comment">// 6 //</span> 111 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">strncmp</span><span class="special">(</span> <span class="identifier">cs4</span><span class="special">.</span><span class="identifier">data</span><span class="special">(),</span> <span class="string">"test"</span><span class="special">,</span> <span class="identifier">cs4</span><span class="special">.</span><span class="identifier">length</span><span class="special">()</span> <span class="special">)</span> <span class="special">==</span> <span class="number">0</span> <span class="special">);</span> 112 113 <span class="identifier">const_string</span> <span class="identifier">cs5</span><span class="special">(</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">data</span><span class="special">(),</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">data</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">length</span><span class="special">()</span> <span class="special">);</span> <span class="comment">// 7 //</span> 114 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">strncmp</span><span class="special">(</span> <span class="identifier">cs5</span><span class="special">.</span><span class="identifier">data</span><span class="special">(),</span> <span class="string">"test_string"</span><span class="special">,</span> <span class="identifier">cs5</span><span class="special">.</span><span class="identifier">length</span><span class="special">()</span> <span class="special">)</span> <span class="special">==</span> <span class="number">0</span> <span class="special">);</span> 115 116 <span class="identifier">const_string</span> <span class="identifier">cs_array</span><span class="special">[]</span> <span class="special">=</span> <span class="special">{</span> <span class="string">"str1"</span><span class="special">,</span> <span class="string">"str2"</span> <span class="special">};</span> <span class="comment">// 8 //</span> 117 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">cs_array</span><span class="special">[</span><span class="number">0</span><span class="special">]</span> <span class="special">==</span> <span class="string">"str1"</span> <span class="special">);</span> 118 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">cs_array</span><span class="special">[</span><span class="number">1</span><span class="special">]</span> <span class="special">==</span> <span class="string">"str2"</span> <span class="special">);</span> 119<span class="special">}</span> 120</pre> 121<p> 122 The constructors_test test case is intended to check a simple feature of 123 the class <code class="computeroutput"><span class="identifier">const_string</span></code>: 124 an ability to construct itself properly based on different arguments. To 125 test this feature I am using such characteristics of constructed object 126 as a data it contains and a length. The specification of the class <code class="computeroutput"><span class="identifier">const_string</span></code> does not contain any expected 127 failures, so, though the constructor can fail if I would pass a pointer 128 to an invalid memory, error check control is not performed (can't require 129 what was not promised :-)). But for any valid input it should work. So 130 I am trying to check a construction for an empty string (1), a NULL string 131 (2) a regular C string(3), an STL string(4), a copy construction(5) and 132 so on. Well, after fixing all the errors in the implementation (do you 133 write programs without errors from scratch?) I am able to pass this test 134 case and the unit test framework gives me the following report: 135 </p> 136<pre class="programlisting"><span class="identifier">Running</span> <span class="number">1</span> <span class="identifier">test</span> <span class="keyword">case</span><span class="special">...</span> 137 138<span class="special">***</span> <span class="identifier">No</span> <span class="identifier">errors</span> <span class="identifier">detected</span> 139</pre> 140<p> 141 Encouraged I am moving on and adding more access methods: 142 </p> 143<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">const_string</span> <span class="special">{</span> 144<span class="keyword">public</span><span class="special">:</span> 145 <span class="comment">//...</span> 146 <span class="keyword">char</span> <span class="keyword">operator</span><span class="special">[](</span> <span class="identifier">size_t</span> <span class="identifier">index</span> <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 147 <span class="keyword">char</span> <span class="identifier">at</span><span class="special">(</span> <span class="identifier">size_t</span> <span class="identifier">index</span> <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 148 <span class="comment">//...</span> 149<span class="special">};</span> 150</pre> 151<p> 152 I added the new feature - I need a new test case to check it. As a result 153 my test suite became to look like this: 154 </p> 155<pre class="programlisting"><span class="preprocessor">#define</span> <a class="link" href="../../utf_reference/link_references/link_boost_test_module_macro.html" title="BOOST_TEST_MODULE"><code class="computeroutput"><span class="identifier">BOOST_TEST_MODULE</span></code></a> <span class="identifier">const_string</span> <span class="identifier">test</span> 156<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 157 158<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">constructors_test</span> <span class="special">)</span> 159<span class="special">{</span> 160 <span class="comment">//...</span> 161<span class="special">}</span> 162 163<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">data_access_test</span> <span class="special">)</span> 164<span class="special">{</span> 165 <span class="identifier">const_string</span> <span class="identifier">cs1</span><span class="special">(</span> <span class="string">"test_string"</span> <span class="special">);</span> <span class="comment">// 1 //</span> 166 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">cs1</span><span class="special">[(</span><span class="identifier">size_t</span><span class="special">)</span><span class="number">0</span><span class="special">]</span> <span class="special">==</span> <span class="char">'t'</span> <span class="special">);</span> 167 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">cs1</span><span class="special">[(</span><span class="identifier">size_t</span><span class="special">)</span><span class="number">4</span><span class="special">]</span> <span class="special">==</span> <span class="char">'_'</span> <span class="special">);</span> 168 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">cs1</span><span class="special">[</span><span class="identifier">cs1</span><span class="special">.</span><span class="identifier">length</span><span class="special">()-</span><span class="number">1</span><span class="special">]</span> <span class="special">==</span> <span class="char">'g'</span> <span class="special">);</span> 169 170 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">cs1</span><span class="special">[(</span><span class="identifier">size_t</span><span class="special">)</span><span class="number">0</span><span class="special">]</span> <span class="special">==</span> <span class="identifier">cs1</span><span class="special">.</span><span class="identifier">at</span><span class="special">(</span> <span class="number">0</span> <span class="special">)</span> <span class="special">);</span> <span class="comment">// 2 //</span> 171 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">cs1</span><span class="special">[(</span><span class="identifier">size_t</span><span class="special">)</span><span class="number">2</span><span class="special">]</span> <span class="special">==</span> <span class="identifier">cs1</span><span class="special">.</span><span class="identifier">at</span><span class="special">(</span> <span class="number">5</span> <span class="special">)</span> <span class="special">);</span> 172 <a class="link" href="../../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a><span class="special">(</span> <span class="identifier">cs1</span><span class="special">.</span><span class="identifier">at</span><span class="special">(</span> <span class="identifier">cs1</span><span class="special">.</span><span class="identifier">length</span><span class="special">()</span> <span class="special">-</span> <span class="number">1</span> <span class="special">)</span> <span class="special">==</span> <span class="char">'g'</span> <span class="special">);</span> 173 174 <span class="identifier">BOOST_CHECK_THROW</span><span class="special">(</span> <span class="identifier">cs1</span><span class="special">.</span><span class="identifier">at</span><span class="special">(</span> <span class="identifier">cs1</span><span class="special">.</span><span class="identifier">length</span><span class="special">()</span> <span class="special">),</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">out_of_range</span> <span class="special">);</span> <span class="comment">// 3 //</span> 175<span class="special">}</span> 176</pre> 177<p> 178 In the data_access_test test case I am trying to check the class <code class="computeroutput"><span class="identifier">const_string</span></code> character access correctness. 179 While tests (1) checks valid access using <code class="computeroutput"><span class="identifier">const_string</span><span class="special">::</span><span class="keyword">operator</span><span class="special">[]</span></code> and test (2) checks valid access using 180 method <code class="computeroutput"><span class="identifier">const_string</span><span class="special">::</span><span class="identifier">at</span><span class="special">()</span></code>, 181 there is one more thing to test. The specification of the method <code class="computeroutput"><span class="identifier">const_string</span><span class="special">::</span><span class="identifier">at</span><span class="special">()</span></code> 182 contains validation for the out of bound access. That was test (3) is intended 183 to do: check that the validation is working. A testing of a validation 184 and error handling code is an important part of a unit testing and should 185 not be left for a production stage. The data_access_test test case passed 186 and I am ready for the next step. 187 </p> 188<p> 189 Continuing my effort I am able to complete class <code class="computeroutput"><span class="identifier">const_string</span></code> 190 (see <a href="../../../../snippet/const_string.hpp" target="_top">Listing 1 <code class="literal">const_string.hpp</code></a>) 191 and testing module for it (see <a href="../../../../snippet/const_string_test.cpp" target="_top">Listing 192 2 <code class="literal">const_string_test.cpp</code></a>) that is checking all 193 features that are presented in the class <code class="computeroutput"><span class="identifier">const_string</span></code> 194 specification. 195 </p> 196<p> 197 Well, I am step closer to fulfilling my new year resolution (we should 198 see about this fitness club sometime next ...). What about you? Your testing 199 habits could be a little different. You could start with a class/library 200 development and then at some point start writing test cases on feature 201 basis. Or you can, given a detailed specification for the future product, 202 including expected interfaces, immediately start with writing all test 203 cases (or it could be a different person, while you working on implementation 204 at the same time). In any case you should not have any problems to use 205 facilities provided by the Boost.Test unit test framework and, let me hope, 206 be able to write a stable, bulletproof code. And what is even more important 207 is your confidence in an ability to make changes of any complexity without 208 involving a lengthy regression testing of your whole product. Your test 209 module and the unit test framework will stay behind your back to help you 210 with any occasional errors. 211 </p> 212</div> 213<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 214<td align="left"></td> 215<td align="right"><div class="copyright-footer">Copyright © 2001-2020 Boost.Test contributors<p> 216 Distributed under the Boost Software License, Version 1.0. (See accompanying 217 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>) 218 </p> 219</div></td> 220</tr></table> 221<hr> 222<div class="spirit-nav"> 223<a accesskey="p" href="../tutorials.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../tutorials.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="hello.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 224</div> 225</body> 226</html> 227
