5. Organizing Tests
One of the goals of PHPUnit is that tests should be composable: we want to be able to run any number or combination of tests together, for instance all tests for the whole project, or the tests for all classes of a component that is part of the project, or just the tests for a single class.
PHPUnit supports different ways of organizing tests and composing them into a test suite. This chapter shows the most commonly used approaches.
Composing a Test Suite Using the Filesystem
Probably the easiest way to compose a test suite is to keep all test case source files in a test directory. PHPUnit can automatically discover and run the tests by recursively traversing the test directory.
Lets take a look at the test suite of the
library. Looking at this project’s directory structure, we see that the
test case classes in the
tests directory mirror the
package and class structure of the System Under Test (SUT) in the
src tests `-- Currency.php `-- CurrencyTest.php `-- IntlFormatter.php `-- IntlFormatterTest.php `-- Money.php `-- MoneyTest.php `-- autoload.php
To run all tests for the library we just need to point the PHPUnit command-line test runner to the test directory:
$ phpunit --bootstrap src/autoload.php tests PHPUnit 7.4.0 by Sebastian Bergmann and contributors. ................................. Time: 636 ms, Memory: 3.50Mb OK (33 tests, 52 assertions)
If you point the PHPUnit command-line test runner to a directory it will
To run only the tests that are declared in the
test case class in
tests/CurrencyTest.php we can use
the following command:
$ phpunit --bootstrap src/autoload.php tests/CurrencyTest PHPUnit 7.4.0 by Sebastian Bergmann and contributors. ........ Time: 280 ms, Memory: 2.75Mb OK (8 tests, 8 assertions)
For more fine-grained control of which tests to run we can use the
$ phpunit --bootstrap src/autoload.php --filter testObjectCanBeConstructedForValidConstructorArgument tests PHPUnit 7.4.0 by Sebastian Bergmann and contributors. .. Time: 167 ms, Memory: 3.00Mb OK (2 test, 2 assertions)
A drawback of this approach is that we have no control over the order in which the tests are run. This can lead to problems with regard to test dependencies, see Test Dependencies. In the next section you will see how you can make the test execution order explicit by using the XML configuration file.
Composing a Test Suite Using XML Configuration
PHPUnit’s XML configuration file (The XML Configuration File)
can also be used to compose a test suite.
shows a minimal
phpunit.xml file that will add all
*Test classes that are found in
*Test.php files when the
directory is recursively traversed.
<phpunit bootstrap="src/autoload.php"> <testsuites> <testsuite name="money"> <directory>tests</directory> </testsuite> </testsuites> </phpunit>
phpunit.xml.dist (in that order) exist in the
current working directory and
not used, the configuration will be automatically
read from that file.
The order in which tests are executed can be made explicit:
<phpunit bootstrap="src/autoload.php"> <testsuites> <testsuite name="money"> <file>tests/IntlFormatterTest.php</file> <file>tests/MoneyTest.php</file> <file>tests/CurrencyTest.php</file> </testsuite> </testsuites> </phpunit>