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authorEric Barnes <eric@ericlbarnes.com>2011-11-27 06:30:22 +0100
committerEric Barnes <eric@ericlbarnes.com>2011-11-27 06:30:22 +0100
commit7e66dda705743cbfe1d522ddb73e5694006ec42c (patch)
treec08b63deb28c09ec49d9173280f1ca234debfe50 /user_guide/libraries/unit_testing.html
parent7eceb03f083643254c7393c6b5ebe539e344a1ba (diff)
parente101593561a10632c1d63180436b19f1d7115046 (diff)
Merge branch 'refs/heads/develop' into feature/unit-tests
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-Unit Testing Class
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-<h1>Unit Testing Class</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>
-
-
-<h2>Initializing the Class</h2>
-
-<p>Like most other classes in CodeIgniter, the Unit Test class is initialized in your controller using the <dfn>$this->load->library</dfn> function:</p>
-
-<code>$this->load->library('unit_test');</code>
-<p>Once loaded, the Unit Test object will be available using: <dfn>$this->unit</dfn></p>
-
-
-<h2>Running Tests</h2>
-
-<p>Running a test involves supplying a test and an expected result to the following function:</p>
-
-<h2>$this->unit->run( <var>test</var>, <var>expected result</var>, '<var>test name</var>', '<var>notes</var>');</h2>
-
-<p>Where <var>test</var> is the result of the code you wish to test, <var>expected result</var> is the data type you expect,
-<var>test name</var> is an optional name you can give your test, and <var>notes</var> are optional notes. Example:</p>
-
-<code>$test = 1 + 1;<br />
-<br />
-$expected_result = 2;<br />
-<br />
-$test_name = 'Adds one plus one';<br />
-<br />
-$this->unit->run($test, $expected_result, $test_name);</code>
-
-<p>The expected result you supply can either be a literal match, or a data type match. Here's an example of a literal:</p>
-
-<code>$this->unit->run('Foo', 'Foo');</code>
-
-<p>Here is an example of a data type match:</p>
-
-<code>$this->unit->run('Foo', 'is_string');</code>
-
-<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>
-<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>
-</ul>
-
-
-<h2>Generating Reports</h2>
-
-<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 <var>run</var> function:</p>
-
-<code>echo $this->unit->run($test, $expected_result);</code>
-
-<p>To run a full report of all tests, use this:</p>
-
-<code>echo $this->unit->report();</code>
-
-<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>
-
-<code>echo $this->unit->result();</code>
-
-
-<h2>Strict Mode</h2>
-
-<p>By default the unit test class evaluates literal matches loosely. Consider this example:</p>
-
-<code>$this->unit->run(1, TRUE);</code>
-
-<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>
-
-<code>if (1 == TRUE) echo 'This evaluates as true';</code>
-
-<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>
-
-<code>if (1 === TRUE) echo 'This evaluates as FALSE';</code>
-
-<p>To enable strict mode use this:</p>
-
-<code>$this->unit->use_strict(TRUE);</code>
-
-<h2>Enabling/Disabling Unit Testing</h2>
-
-<p>If you would like to leave some testing in place in your scripts, but not have it run unless you need it, you can disable
-unit testing using:</p>
-
-<code>$this->unit->active(FALSE)</code>
-
-<h2>Unit Test Display</h2>
-
-<p>When your unit test results display, the following items show by default:</p>
-
-<ul>
- <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>
-
-You can customize which of these items get displayed by using <kbd>$this->unit->set_items()</kbd>. For example, if you only wanted the test name and the result displayed:</p>
-
-<h3>Customizing displayed tests</h3>
-
-<code>
- $this->unit->set_test_items(array('test_name', 'result'));
-</code>
-
-<h3>Creating a Template</h3>
-
-<p>If you would like your test results formatted differently then the default you can set your own template. Here is an
-example of a simple template. Note the required pseudo-variables:</p>
-
-<code>
-$str = '<br />
-&lt;table border="0" cellpadding="4" cellspacing="1"><br />
-&nbsp;&nbsp;&nbsp;&nbsp;<kbd>{rows}</kbd><br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;tr><br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;td><kbd>{item}</kbd>&lt;/td><br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;td><kbd>{result}</kbd>&lt;/td><br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;/tr><br />
-&nbsp;&nbsp;&nbsp;&nbsp;<kbd>{/rows}</kbd><br />
-&lt;/table>';<br />
-<br />
-$this->unit->set_template($str);
-</code>
-
-<p class="important"><strong>Note:</strong> Your template must be declared <strong>before</strong> running the unit test process.</p>
-
-
-
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