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Writing PHPUnit tests

From MoodleDocs

Moodle 2.3


Moodle PHPUnit integration is designed to allow easy adding of new tests. At the start of each test the state is automatically reset to fresh new installation (unless explicitly told not to reset).

Testcase classes

There are two basic test class that are supposed to used in all Moodle unit tests - basic_testcase and advanced_testcase.

basic_testcase
Very simple tests that do not modify database, dataroot or any PHP globals. It can be used for example when trying examples from the official PHPUnit tutorial.
advanced_testcase
Enhanced testcase class enhanced for easy testing of Moodle code.

There is a third testcase class that is specially designed for testing of our Moodle database layer, it should not be used for other purposes.

Assertions

The complete list of assertions can be found in the phpunit manual.

Sample plugin testcase

PHPUnit tests are located in tests/*_test.php files in your plugin, for example mod/myplugin/tests/myplugin_test.php, the file should contain only one class that extends advanced_testcase:

class mod_myplugin_testcase extends advanced_testcase {
    public function test_adding() {
        $this->assertEquals(2, 1+2);
    }
}

Automatic state reset

By default after each test Moodle database and dataroot is automatically reset to the original state which was present right after installation. make sure to use $this->resetAfterTest() to indicate that the database or changes of standard global variables are expected.

class mod_myplugin_testcase extends advanced_testcase {
    public function test_deleting() {
        global $DB;
        $this->resetAfterTest(true);
        $DB->delete_records('user');
        $this->assertEmpty($DB->get_records('user'));
    }
    public function test_user_table_was_reset() {
        global $DB;
        $this->assertEquals(2, $DB->count_records('user', array()));
    }
}

Generators

Tests that need to modify default installation may use generators to create new courses, users, etc. All examples on this page should be used from test methods of a test class derived from advanced_testcase.

Creating users

At the start of each test there are only two users present - guest and administrator. If you need to add more test accounts use:

$user = $this->getDataGenerator()->create_user();

You may also specify properties of the user account, for example:

$user1 = $this->getDataGenerator()->create_user(array('email'=>'user1@example.com', 'username'=>'user1');

By default no user is logged-in, use setUser() method to change current $USER value:

$this->setUser($user1);

Guest and admin accounts have a shortcut methods:

$this->setGuestUser();
$this->setAdminUser();

Null can be used to set current user back to not-logged-in:

$this->setUser(null);

Creating course categories

$category1 = $this->getDataGenerator()->create_category();
$category2 = $this->getDataGenerator()->create_category(array('name'=>'Some subcategory', 'parent'=>$category1->id));

Creating courses

$course1 = $this->getDataGenerator()->create_course();

$category = $this->getDataGenerator()->create_category();
$course2 = $this->getDataGenerator()->create_course(array('name'=>'Some course', 'category'=>$category->id));

Creating activities

Some activity plugins include instance generators. The generator class are defined in plugindirectory/tests/generator/lib.php.

Example of creation of new course with one page resource:

$course = $this->getDataGenerator()->create_course();
$generator = $this->getDataGenerator()->get_plugin_generator('mod_page');
$generator->create_instance(array('course'=>$course->id));

Creating cohorts

Moodle 2.4

Since 2.4 there the data generator supports creation of new cohorts.

$cohort = $this->getDataGenerator()->create_cohort();

Simplified user enrolments

Moodle 2.4

Instead of standard enrolment API it is possible to use simplified method in data generator. It is intended to be used with self and manual enrolment plugins.

$this->getDataGenerator()->enrol_user($userid, $courseid); $this->getDataGenerator()->enrol_user($userid, $courseid, $teacherroleid); $this->getDataGenerator()->enrol_user($userid, $courseid, $teacherroleid, 'manual');

Long tests

All standard test should execute as fast as possible. Tests that take a loner time to execute (>10s) or are otherwise expensive (such as querying external servers that might be flooded by all dev machines) should be execute only when PHPUNIT_LONGTEST is true. This constant can be set in phpunit.xml or directly in config.php.

Large test data

See advanced_testcase::createXMLDataSet() and advanced_testcase::createCsvDataSet() and related functions there for easier ways to manage large test data sets within files rather than arrays in code. See PHPUnit_integration#Extra_methods

Testing sending of messages

Moodle 2.4

You can temporarily redirect all messages sent via message_send() to a message sink object. This allow developer to verify that the tested code is sending expected messages.

To test code using messaging first disable the use of transactions and then redirect the messaging into a new message sink, you can inspect the results later. $this->preventResetByRollback(); $sink = $this->redirectMessages(); //... code that is sending messages $messages = $sink->get_messages(); $this->assertEquals(3, count($messages)); //.. test messages were generated in correct order with appropriate content

Extra test settings

Usually the test should not interact with any external systems and it should work the same on all systems. But sometimes you need to specify some option for connection to external systems or system configuration. It is intentionally not possible to use $CFG settings from config.php.

There are several ways how to inject your custom settings:

  • define test setting constants in your phpunit.xml file
  • define test setting constants in your config.php

These constants may be then used in your test or plugin code.

See also