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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>Code Igniter'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 Code Igniter, 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>' );</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, and <var>test name</var> is an optional name you can give your test. 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_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>$this->unit->strict(TRUE);</code> | |
| <h2>Enabling/Disabling Unit Testing</h2> | |
| <p>If you would like to leave some testing in place in your scripts, but not have it run unless you need it, you can disable | |
| unit testing using:</p> | |
| <code>$this->unit->active(FALSE)</code> | |
| <h2>Creating a Template</h2> | |
| <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 /> | |
| <table border="0" cellpadding="4" cellspacing="1"><br /> | |
| <kbd>{rows}</kbd><br /> | |
| <tr><br /> | |
| <td><kbd>{item}</kbd></td><br /> | |
| <td><kbd>{result}</kbd></td><br /> | |
| </tr><br /> | |
| <kbd>{/rows}</kbd><br /> | |
| </table>';<br /> | |
| <br /> | |
| $this->unit->set_template($str); | |
| </code> | |
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