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052 - About PHPUnit

PHPUnit is such an infrastructure. It is a family of PEAR packages (PHPUnit, PHPUnit2) that is available from the PHP Extension and Application Repository (PEAR), a framework and distribution system for reusable PHP components. You can install it using the PEAR Installer by running.

pear install --alldeps phpunit2

Due to PEAR's version naming standard, the PHPUnit package for PHP 5 is PHPUnit2.
The following example shows how you have to write your two tests to use them with PHPUnit.

Example(Testing array and sizeof() with phpunit2):

require_once 'PHPUnit2/Framework/TestCase.php';
class ArrayTest extends PHPUnit2_Framework_TestCase {
public function testNewArrayIsEmpty() {
// Create the Array fixture.
$fixture = Array();
// Assert that the size of the Array fixture is 0.
$this->assertEquals(0, sizeof($fixture));
}
public function testArrayContainsAnElement() {
// Create the Array fixture.
$fixture = Array();
// Add an element to the Array fixture.
$fixture[] = 'Element';
// Assert that the size of the Array fixture is 1.
$this->assertEquals(1, sizeof($fixture));
}
}

Example shows the basic steps for writing tests with PHPUnit:

  • The tests for a class Class go into a class ClassTest.
  • ClassTest inherits (most of the time) from PHPUnit2_Framework_TestCase.
  • The tests are public methods that expect no parameters and are named test*.
  • Inside the test, assertion methods such as assertEquals() assert that an actual value matches an expected value.
$ phpunit ArrayTest
PHPUnit 2.3.6 by Sebastian Bergmann.
....................
Time: xxxxxxxx
OK(2 tests)

For each test run, the PHPUnit command-line tool prints one character to indicate progress:

  • . : Printed when the test succeeds.
  • F : Printed when an assertion fails while running the test method.
  • E : Printed when an error occurs while running the test method.
  • I : Printed when the test is marked as being incomplete or not yet implemented.

PHPUnit distinguishes between failures and errors. A failure is a violated PHPUnit assertion.
An error is an unexpected exception or a PHP error. Sometimes this distinction proves useful,
since errors tend to be easier to fix than failures. If you have a big list of problems, it is best
to tackle the errors first and see if you have any failures left when you have fixed them all.

$ phpunit ArrayTest
PHPUnit 2.3.0 by Sebastian Bergmann.
.F
Time: 0.001147
There was 1 failure:
1) testArrayContainsAnElement(ArrayTest)
expected same: <0> was not: <1>
/home/sb/ArrayTest.php:21
FAILURES!!!
Tests run: 2, Failures: 1, Errors: 0, Incomplete Tests: 0.

The report shows where the failure occurs in the test code: in the test method
testArrayContainsAnElement() of the test case class ArrayTest, in line 21 of
the /home/sb/ArrayTest.php test code source file.

 

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