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authorAndrey Andreev <narf@devilix.net>2018-03-22 15:48:55 +0100
committerAndrey Andreev <narf@devilix.net>2018-03-22 15:48:55 +0100
commit71e647782764184e3aab4faffe6d99176758979f (patch)
tree74dbdd50a61cd5674915c144aca9ebbc00b235b8 /user_guide/libraries/unit_testing.html
parentb12fbad77bd69ca0c7624a9094c29b7691ea6107 (diff)
[ci skip] 3.1.8 release
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+
+ <div class="section" id="unit-testing-class">
+<h1>Unit Testing Class<a class="headerlink" href="#unit-testing-class" title="Permalink to this headline">¶</a></h1>
+<p>Unit testing is an approach to software development in which tests are
+written for each function in your application. If you are not familiar
+with the concept you might do a little googling on the subject.</p>
+<p>CodeIgniter’s Unit Test class is quite simple, consisting of an
+evaluation function and two result functions. It’s not intended to be a
+full-blown test suite but rather a simple mechanism to evaluate your
+code to determine if it is producing the correct data type and result.</p>
+<div class="contents local topic" id="contents">
+<ul class="simple">
+<li><a class="reference internal" href="#using-the-unit-testing-library" id="id1">Using the Unit Testing Library</a><ul>
+<li><a class="reference internal" href="#initializing-the-class" id="id2">Initializing the Class</a></li>
+<li><a class="reference internal" href="#running-tests" id="id3">Running Tests</a></li>
+<li><a class="reference internal" href="#generating-reports" id="id4">Generating Reports</a></li>
+<li><a class="reference internal" href="#strict-mode" id="id5">Strict Mode</a></li>
+<li><a class="reference internal" href="#enabling-disabling-unit-testing" id="id6">Enabling/Disabling Unit Testing</a></li>
+<li><a class="reference internal" href="#unit-test-display" id="id7">Unit Test Display</a><ul>
+<li><a class="reference internal" href="#customizing-displayed-tests" id="id8">Customizing displayed tests</a></li>
+<li><a class="reference internal" href="#creating-a-template" id="id9">Creating a Template</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li><a class="reference internal" href="#class-reference" id="id10">Class Reference</a></li>
+</ul>
+</div>
+<div class="custom-index container"></div><div class="section" id="using-the-unit-testing-library">
+<h2><a class="toc-backref" href="#id1">Using the Unit Testing Library</a><a class="headerlink" href="#using-the-unit-testing-library" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="initializing-the-class">
+<h3><a class="toc-backref" href="#id2">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h3>
+<p>Like most other classes in CodeIgniter, the Unit Test class is
+initialized in your controller using the $this-&gt;load-&gt;library function:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;unit_test&#39;</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>Once loaded, the Unit Test object will be available using <code class="docutils literal"><span class="pre">$this-&gt;unit</span></code></p>
+</div>
+<div class="section" id="running-tests">
+<h3><a class="toc-backref" href="#id3">Running Tests</a><a class="headerlink" href="#running-tests" title="Permalink to this headline">¶</a></h3>
+<p>Running a test involves supplying a test and an expected result in the
+following way:</p>
+<blockquote>
+<div>$this-&gt;unit-&gt;run(‘test’, ‘expected result’, ‘test name’, ‘notes’);</div></blockquote>
+<p>Where test is the result of the code you wish to test, expected result
+is the data type you expect, test name is an optional name you can give
+your test, and notes are optional notes. Example:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$test</span> <span class="o">=</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">1</span><span class="p">;</span>
+
+<span class="nv">$expected_result</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span>
+
+<span class="nv">$test_name</span> <span class="o">=</span> <span class="s1">&#39;Adds one plus one&#39;</span><span class="p">;</span>
+
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">unit</span><span class="o">-&gt;</span><span class="na">run</span><span class="p">(</span><span class="nv">$test</span><span class="p">,</span> <span class="nv">$expected_result</span><span class="p">,</span> <span class="nv">$test_name</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>The expected result you supply can either be a literal match, or a data
+type match. Here’s an example of a literal:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">unit</span><span class="o">-&gt;</span><span class="na">run</span><span class="p">(</span><span class="s1">&#39;Foo&#39;</span><span class="p">,</span> <span class="s1">&#39;Foo&#39;</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>Here is an example of a data type match:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">unit</span><span class="o">-&gt;</span><span class="na">run</span><span class="p">(</span><span class="s1">&#39;Foo&#39;</span><span class="p">,</span> <span class="s1">&#39;is_string&#39;</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>Notice the use of “is_string” in the second parameter? This tells the
+function to evaluate whether your test is producing a string as the
+result. Here is a list of allowed comparison types:</p>
+<ul class="simple">
+<li>is_object</li>
+<li>is_string</li>
+<li>is_bool</li>
+<li>is_true</li>
+<li>is_false</li>
+<li>is_int</li>
+<li>is_numeric</li>
+<li>is_float</li>
+<li>is_double</li>
+<li>is_array</li>
+<li>is_null</li>
+<li>is_resource</li>
+</ul>
+</div>
+<div class="section" id="generating-reports">
+<h3><a class="toc-backref" href="#id4">Generating Reports</a><a class="headerlink" href="#generating-reports" title="Permalink to this headline">¶</a></h3>
+<p>You can either display results after each test, or your can run several
+tests and generate a report at the end. To show a report directly simply
+echo or return the run function:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">unit</span><span class="o">-&gt;</span><span class="na">run</span><span class="p">(</span><span class="nv">$test</span><span class="p">,</span> <span class="nv">$expected_result</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>To run a full report of all tests, use this:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">unit</span><span class="o">-&gt;</span><span class="na">report</span><span class="p">();</span>
+</pre></div>
+</div>
+<p>The report will be formatted in an HTML table for viewing. If you prefer
+the raw data you can retrieve an array using:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">unit</span><span class="o">-&gt;</span><span class="na">result</span><span class="p">();</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="strict-mode">
+<h3><a class="toc-backref" href="#id5">Strict Mode</a><a class="headerlink" href="#strict-mode" title="Permalink to this headline">¶</a></h3>
+<p>By default the unit test class evaluates literal matches loosely.
+Consider this example:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">unit</span><span class="o">-&gt;</span><span class="na">run</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>The test is evaluating an integer, but the expected result is a boolean.
+PHP, however, due to it’s loose data-typing will evaluate the above code
+as TRUE using a normal equality test:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="mi">1</span> <span class="o">==</span> <span class="k">TRUE</span><span class="p">)</span> <span class="k">echo</span> <span class="s1">&#39;This evaluates as true&#39;</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>If you prefer, you can put the unit test class in to strict mode, which
+will compare the data type as well as the value:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="mi">1</span> <span class="o">===</span> <span class="k">TRUE</span><span class="p">)</span> <span class="k">echo</span> <span class="s1">&#39;This evaluates as FALSE&#39;</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>To enable strict mode use this:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">unit</span><span class="o">-&gt;</span><span class="na">use_strict</span><span class="p">(</span><span class="k">TRUE</span><span class="p">);</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="enabling-disabling-unit-testing">
+<h3><a class="toc-backref" href="#id6">Enabling/Disabling Unit Testing</a><a class="headerlink" href="#enabling-disabling-unit-testing" title="Permalink to this headline">¶</a></h3>
+<p>If you would like to leave some testing in place in your scripts, but
+not have it run unless you need it, you can disable unit testing using:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">unit</span><span class="o">-&gt;</span><span class="na">active</span><span class="p">(</span><span class="k">FALSE</span><span class="p">);</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="unit-test-display">
+<h3><a class="toc-backref" href="#id7">Unit Test Display</a><a class="headerlink" href="#unit-test-display" title="Permalink to this headline">¶</a></h3>
+<p>When your unit test results display, the following items show by
+default:</p>
+<ul class="simple">
+<li>Test Name (test_name)</li>
+<li>Test Datatype (test_datatype)</li>
+<li>Expected Datatype (res_datatype)</li>
+<li>Result (result)</li>
+<li>File Name (file)</li>
+<li>Line Number (line)</li>
+<li>Any notes you entered for the test (notes)</li>
+</ul>
+<p>You can customize which of these items get displayed by using
+$this-&gt;unit-&gt;set_test_items(). For example, if you only wanted the test name
+and the result displayed:</p>
+<div class="section" id="customizing-displayed-tests">
+<h4><a class="toc-backref" href="#id8">Customizing displayed tests</a><a class="headerlink" href="#customizing-displayed-tests" title="Permalink to this headline">¶</a></h4>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">unit</span><span class="o">-&gt;</span><span class="na">set_test_items</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">&#39;test_name&#39;</span><span class="p">,</span> <span class="s1">&#39;result&#39;</span><span class="p">));</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="creating-a-template">
+<h4><a class="toc-backref" href="#id9">Creating a Template</a><a class="headerlink" href="#creating-a-template" title="Permalink to this headline">¶</a></h4>
+<p>If you would like your test results formatted differently then the
+default you can set your own template. Here is an example of a simple
+template. Note the required pseudo-variables:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$str</span> <span class="o">=</span> <span class="s1">&#39;</span>
+<span class="s1">&lt;table border=&quot;0&quot; cellpadding=&quot;4&quot; cellspacing=&quot;1&quot;&gt;</span>
+<span class="s1">{rows}</span>
+<span class="s1"> &lt;tr&gt;</span>
+<span class="s1"> &lt;td&gt;{item}&lt;/td&gt;</span>
+<span class="s1"> &lt;td&gt;{result}&lt;/td&gt;</span>
+<span class="s1"> &lt;/tr&gt;</span>
+<span class="s1">{/rows}</span>
+<span class="s1">&lt;/table&gt;&#39;</span><span class="p">;</span>
+
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">unit</span><span class="o">-&gt;</span><span class="na">set_template</span><span class="p">(</span><span class="nv">$str</span><span class="p">);</span>
+</pre></div>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Your template must be declared <strong>before</strong> running the unit
+test process.</p>
+</div>
+</div>
+</div>
+</div>
+<div class="section" id="class-reference">
+<h2><a class="toc-backref" href="#id10">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
+<dl class="class">
+<dt id="CI_Unit_test">
+<em class="property">class </em><code class="descname">CI_Unit_test</code><a class="headerlink" href="#CI_Unit_test" title="Permalink to this definition">¶</a></dt>
+<dd><dl class="method">
+<dt id="CI_Unit_test::set_test_items">
+<code class="descname">set_test_items</code><span class="sig-paren">(</span><em>$items</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Unit_test::set_test_items" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$items</strong> (<em>array</em>) – List of visible test items</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">void</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Sets a list of items that should be visible in tests.
+Valid options are:</p>
+<blockquote>
+<div><ul class="simple">
+<li>test_name</li>
+<li>test_datatype</li>
+<li>res_datatype</li>
+<li>result</li>
+<li>file</li>
+<li>line</li>
+<li>notes</li>
+</ul>
+</div></blockquote>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Unit_test::run">
+<code class="descname">run</code><span class="sig-paren">(</span><em>$test</em><span class="optional">[</span>, <em>$expected = TRUE</em><span class="optional">[</span>, <em>$test_name = 'undefined'</em><span class="optional">[</span>, <em>$notes = ''</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Unit_test::run" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$test</strong> (<em>mixed</em>) – Test data</li>
+<li><strong>$expected</strong> (<em>mixed</em>) – Expected result</li>
+<li><strong>$test_name</strong> (<em>string</em>) – Test name</li>
+<li><strong>$notes</strong> (<em>string</em>) – Any notes to be attached to the test</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Test report</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Runs unit tests.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Unit_test::report">
+<code class="descname">report</code><span class="sig-paren">(</span><span class="optional">[</span><em>$result = array()</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Unit_test::report" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$result</strong> (<em>array</em>) – Array containing tests results</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Test report</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Generates a report about already complete tests.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Unit_test::use_strict">
+<code class="descname">use_strict</code><span class="sig-paren">(</span><span class="optional">[</span><em>$state = TRUE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Unit_test::use_strict" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$state</strong> (<em>bool</em>) – Strict state flag</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Enables/disables strict type comparison in tests.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Unit_test::active">
+<code class="descname">active</code><span class="sig-paren">(</span><span class="optional">[</span><em>$state = TRUE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Unit_test::active" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$state</strong> (<em>bool</em>) – Whether to enable testing</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Enables/disables unit testing.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Unit_test::result">
+<code class="descname">result</code><span class="sig-paren">(</span><span class="optional">[</span><em>$results = array()</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Unit_test::result" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$results</strong> (<em>array</em>) – Tests results list</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Array of raw result data</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">array</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Returns raw tests results data.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Unit_test::set_template">
+<code class="descname">set_template</code><span class="sig-paren">(</span><em>$template</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Unit_test::set_template" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$template</strong> (<em>string</em>) – Test result template</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Sets the template for displaying tests results.</p>
+</dd></dl>
+
+</dd></dl>
+
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+</div>
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