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admin41a16852006-09-26 18:17:19 +0000[diff] [blame]36<td><h1>Code Igniter User Guide Version 1.5.0</h1></td>
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48<a href="http://www.codeigniter.com/">Code Igniter Home</a> &nbsp;&#8250;&nbsp;
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50Unit Testing Class
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63
64<h1>Unit Testing Class</h1>
65
66<p>Unit testing is an approach to software development in which tests are written for each function in your application.
67If you are not familiar with the concept you might do a little googling on the subject.</p>
68
69<p>Code Igniter's Unit Test class is quite simple, consisting of an evaluation function and two result functions.
70It's not intended to be a full-blown test suite but rather a simple mechanism to evaluate your code
71to determine if it is producing the correct data type and result.
72</p>
73
74
75<h2>Initializing the Class</h2>
76
77<p>Like most other classes in Code Igniter, the Unit Test class is initialized in your controller using the <dfn>$this->load->library</dfn> function:</p>
78
79<code>$this->load->library('unit_test');</code>
80<p>Once loaded, the Unit Test object will be available using: <dfn>$this->unit</dfn></p>
81
82
83<h2>Running Tests</h2>
84
85<p>Running a test involves supplying a test and an expected result to the following function:</p>
86
87<h2>$this->unit->run( <var>test</var>, <var>expected result</var>, '<var>test name</var>' );</h2>
88
89<p>Where <var>test</var> is the result of the code you wish to test,
90<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>
91
92<code>$test = 1 + 1;<br />
93<br />
94$expected_result = 2;<br />
95<br />
96$test_name = 'Adds one plus one';<br />
97<br />
98$this->unit->run($test, $expected_result, $test_name);</code>
99
100<p>The expected result you supply can either be a literal match, or a data type match. Here's an example of a literal:</p>
101
102<code>$this->unit->run('Foo', 'Foo');</code>
103
104<p>Here is an example of a data type match:</p>
105
106<code>$this->unit->run('Foo', 'is_string');</code>
107
108<p>Notice the use of "is_string" in the second parameter? This tells the function to evaluate whether your test is producing a string
109as the result. Here is a list of allowed comparison types:</p>
110
111<ul>
112<li>is_string</li>
113<li>is_bool</li>
114<li>is_true</li>
115<li>is_false</li>
116<li>is_int</li>
117<li>is_numeric</li>
118<li>is_float</li>
119<li>is_double</li>
120<li>is_array</li>
121<li>is_null</li>
122</ul>
123
124
125<h2>Generating Reports</h2>
126
127<p>You can either display results after each test, or your can run several tests and generate a report at the end.
128To show a report directly simply echo or return the <var>run</var> function:</p>
129
130<code>echo $this->unit->run($test, $expected_result);</code>
131
132<p>To run a full report of all tests, use this:</p>
133
134<code>echo $this->unit->report();</code>
135
136<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>
137
138<code>echo $this->unit->result();</code>
139
140
141<h2>Strict Mode</h2>
142
143<p>By default the unit test class evaluates literal matches loosely. Consider this example:</p>
144
145<code>$this->unit->run(1, TRUE);</code>
146
147<p>The test is evaluating an integer, but the expected result is a boolean. PHP, however, due to it's loose data-typing
148will evaluate the above code as TRUE using a normal equality test:</p>
149
150<code>if (1 == TRUE) echo 'This evaluates as true';</code>
151
152<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>
153
154<code>if (1 === TRUE) echo 'This evaluates as FALSE';</code>
155
156<p>To enable strict mode use this:</p>
157
158<code>$this->unit->strict(TRUE);</code>
159
160<h2>Enabling/Disabling Unit Testing</h2>
161
162<p>If you would like to leave some testing in place in your scripts, but not have it run unless you need it, you can disable
163unit testing using:</p>
164
165<code>$this->unit->active(FALSE)</code>
166
167
168
169<h2>Creating a Template</h2>
170
171<p>If you would like your test results formatted differently then the default you can set your own template. Here is an
172example of a simple template. Note the required pseudo-variables:</p>
173
174<code>
175$str = '<br />
176&lt;table border="0" cellpadding="4" cellspacing="1"><br />
177&nbsp;&nbsp;&nbsp;&nbsp;<kbd>{rows}</kbd><br />
178&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;tr><br />
179&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;td><kbd>{item}</kbd>&lt;/td><br />
180&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;td><kbd>{result}</kbd>&lt;/td><br />
181&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;/tr><br />
182&nbsp;&nbsp;&nbsp;&nbsp;<kbd>{/rows}</kbd><br />
183&lt;/table>';<br />
184<br />
185$this->unit->set_template($str);
186</code>
187
adminc47289a2006-09-17 18:09:42 +0000[diff] [blame]188<p class="important"><strong>Note:</strong> Your template must be declared <strong>before</strong> running the unit test process.</p>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]189
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