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- <div class="titlepage"><div><div><h4 class="title">
- <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
- driven development with Boost.Test</a>
- </h4></div></div></div>
- <p>
- Today is a momentous day - first day of new year. Today I am going to start
- a new life. I am going to stop eating a greasy food, start attending a
- fitness club and ... today I am going to test programs I am writing. I
- can start right after the last line of a program is completed or, even
- better, I can write tests while I am coding. And maybe next time I will
- write tests before the coding, during the design stage. I have read a lot
- of literature on how to write the tests, I have the unit test framework
- in hand and an idea of new class. So let's get started.
- </p>
- <p>
- Let say I want to encapsulate an unchangeable C character buffer with a
- length into the simple class <code class="computeroutput"><span class="identifier">const_string</span></code>.
- Rationale: a string class that does not allocate a memory and provide a
- convenient read-only access to the pre-allocated character buffer. I will
- probably want <code class="computeroutput"><span class="identifier">const_string</span></code>
- to have an interface similar to the class std::string. What will I do first?
- In my new life I will start with writing a test module for future class
- <code class="computeroutput"><span class="identifier">const_string</span></code>. It will look
- like this:
- </p>
- <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>
- <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>
- </pre>
- <p>
- Now I can compile it and link with the unit test framework. Done! I have
- a working test program. It is empty, so when I run the program it produces
- following output:
- </p>
- <pre class="programlisting"><span class="special">***</span> <span class="identifier">No</span> <span class="identifier">errors</span> <span class="identifier">detected</span></pre>
- <p>
- Well, now it could be a good time to start a work on <code class="computeroutput"><span class="identifier">const_string</span></code>.
- First thing I imagine would be good to have is a constructors and trivial
- access methods. So my class initial version looks like this:
- </p>
- <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">const_string</span> <span class="special">{</span>
- <span class="keyword">public</span><span class="special">:</span>
- <span class="comment">// Constructors</span>
- <span class="identifier">const_string</span><span class="special">();</span>
- <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>
- <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">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>
- <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>
- <span class="comment">// Access methods</span>
- <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>
- <span class="identifier">size_t</span> <span class="identifier">length</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
- <span class="keyword">bool</span> <span class="identifier">is_empty</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
- <span class="comment">// ...</span>
- <span class="special">};</span>
- </pre>
- <p>
- Now I am able to write a first test case - constructors testing - and add
- it to a test suite. My test program became to look like this:
- </p>
- <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>
- <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>
- <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>
- <span class="special">{</span>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <span class="identifier">const_string</span> <span class="identifier">cs2</span><span class="special">(</span> <span class="identifier">s</span> <span class="special">);</span>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <span class="special">}</span>
- </pre>
- <p>
- The constructors_test test case is intended to check a simple feature of
- the class <code class="computeroutput"><span class="identifier">const_string</span></code>:
- an ability to construct itself properly based on different arguments. To
- test this feature I am using such characteristics of constructed object
- 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
- failures, so, though the constructor can fail if I would pass a pointer
- to an invalid memory, error check control is not performed (can't require
- what was not promised :-)). But for any valid input it should work. So
- I am trying to check a construction for an empty string (1), a NULL string
- (2) a regular C string(3), an STL string(4), a copy construction(5) and
- so on. Well, after fixing all the errors in the implementation (do you
- write programs without errors from scratch?) I am able to pass this test
- case and the unit test framework gives me the following report:
- </p>
- <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>
- <span class="special">***</span> <span class="identifier">No</span> <span class="identifier">errors</span> <span class="identifier">detected</span>
- </pre>
- <p>
- Encouraged I am moving on and adding more access methods:
- </p>
- <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">const_string</span> <span class="special">{</span>
- <span class="keyword">public</span><span class="special">:</span>
- <span class="comment">//...</span>
- <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>
- <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>
- <span class="comment">//...</span>
- <span class="special">};</span>
- </pre>
- <p>
- I added the new feature - I need a new test case to check it. As a result
- my test suite became to look like this:
- </p>
- <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>
- <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>
- <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>
- <span class="special">{</span>
- <span class="comment">//...</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">data_access_test</span> <span class="special">)</span>
- <span class="special">{</span>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <span class="special">}</span>
- </pre>
- <p>
- 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.
- 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
- method <code class="computeroutput"><span class="identifier">const_string</span><span class="special">::</span><span class="identifier">at</span><span class="special">()</span></code>,
- 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>
- contains validation for the out of bound access. That was test (3) is intended
- to do: check that the validation is working. A testing of a validation
- and error handling code is an important part of a unit testing and should
- not be left for a production stage. The data_access_test test case passed
- and I am ready for the next step.
- </p>
- <p>
- Continuing my effort I am able to complete class <code class="computeroutput"><span class="identifier">const_string</span></code>
- (see <a href="../../../../snippet/const_string.hpp" target="_top">Listing 1 <code class="literal">const_string.hpp</code></a>)
- and testing module for it (see <a href="../../../../snippet/const_string_test.cpp" target="_top">Listing
- 2 <code class="literal">const_string_test.cpp</code></a>) that is checking all
- features that are presented in the class <code class="computeroutput"><span class="identifier">const_string</span></code>
- specification.
- </p>
- <p>
- Well, I am step closer to fulfilling my new year resolution (we should
- see about this fitness club sometime next ...). What about you? Your testing
- habits could be a little different. You could start with a class/library
- development and then at some point start writing test cases on feature
- basis. Or you can, given a detailed specification for the future product,
- including expected interfaces, immediately start with writing all test
- cases (or it could be a different person, while you working on implementation
- at the same time). In any case you should not have any problems to use
- facilities provided by the Boost.Test unit test framework and, let me hope,
- be able to write a stable, bulletproof code. And what is even more important
- is your confidence in an ability to make changes of any complexity without
- involving a lengthy regression testing of your whole product. Your test
- module and the unit test framework will stay behind your back to help you
- with any occasional errors.
- </p>
- </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
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- </p>
- </div></td>
- </tr></table>
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