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+### Setup your environment for tests
+
+The framework used is [PHPUnit](https://phpunit.de/); it can be installed with [Composer](https://getcomposer.org/), which is a dependency management tool.
+
+Regarding Composer, you can either use:
+
+- a system-wide version, e.g. installed through your distro's package manager
+- a local version, downloadable [here](https://getcomposer.org/download/)
+
+#### Sample usage
+
+```bash
+# system-wide version
+$ composer install
+$ composer update
+
+# local version
+$ php composer.phar self-update
+$ php composer.phar install
+$ php composer.phar update
+```
+
+#### Install Shaarli dev dependencies
+
+```bash
+$ cd /path/to/shaarli
+$ composer update
+```
+
+#### Install and enable Xdebug to generate PHPUnit coverage reports
+
+For Debian-based distros:
+```bash
+$ aptitude install php5-xdebug
+```
+For ArchLinux:
+```bash
+$ pacman -S xdebug
+```
+
+Then add the following line to `/etc/php/php.ini`:
+```ini
+zend_extension=xdebug.so
+```
+
+#### Run unit tests
+
+Successful test suite:
+```bash
+$ make test
+
+-------
+PHPUNIT
+-------
+PHPUnit 4.6.9 by Sebastian Bergmann and contributors.
+
+Configuration read from /home/virtualtam/public_html/shaarli/phpunit.xml
+
+....................................
+
+Time: 759 ms, Memory: 8.25Mb
+
+OK (36 tests, 65 assertions)
+```
+
+Test suite with failures and errors:
+```bash
+$ make test
+-------
+PHPUNIT
+-------
+PHPUnit 4.6.9 by Sebastian Bergmann and contributors.
+
+Configuration read from /home/virtualtam/public_html/shaarli/phpunit.xml
+
+E..FF...............................
+
+Time: 802 ms, Memory: 8.25Mb
+
+There was 1 error:
+
+1) LinkDBTest::testConstructLoggedIn
+Missing argument 2 for LinkDB::__construct(), called in /home/virtualtam/public_html/shaarli/tests/Link\
+DBTest.php on line 79 and defined
+
+/home/virtualtam/public_html/shaarli/application/LinkDB.php:58
+/home/virtualtam/public_html/shaarli/tests/LinkDBTest.php:79
+
+--
+
+There were 2 failures:
+
+1) LinkDBTest::testCheckDBNew
+Failed asserting that two strings are equal.
+--- Expected
++++ Actual
+@@ @@
+-'e3edea8ea7bb50be4bcb404df53fbb4546a7156e'
++'85eab0c610d4f68025f6ed6e6b6b5fabd4b55834'
+
+/home/virtualtam/public_html/shaarli/tests/LinkDBTest.php:121
+
+2) LinkDBTest::testCheckDBLoad
+Failed asserting that two strings are equal.
+--- Expected
++++ Actual
+@@ @@
+-'e3edea8ea7bb50be4bcb404df53fbb4546a7156e'
++'85eab0c610d4f68025f6ed6e6b6b5fabd4b55834'
+
+/home/virtualtam/public_html/shaarli/tests/LinkDBTest.php:133
+
+FAILURES!
+Tests: 36, Assertions: 63, Errors: 1, Failures: 2.
+```
+
+#### Test results and coverage
+
+By default, PHPUnit will run all suitable tests found under the `tests` directory.
+
+Each test has 3 possible outcomes:
+
+- `.` - success
+- `F` - failure: the test was run but its results are invalid
+    - the code does not behave as expected
+    - dependencies to external elements: globals, session, cache...
+- `E` - error: something went wrong and the tested code has crashed
+    - typos in the code, or in the test code
+    - dependencies to missing external elements
+
+If Xdebug has been installed and activated, two coverage reports will be generated:
+
+- a summary in the console
+- a detailed HTML report with metrics for tested code
+    - to open it in a web browser: `firefox coverage/index.html &`
+
+### Executing specific tests
+
+Add a [`@group`](https://phpunit.de/manual/current/en/appendixes.annotations.html#appendixes.annotations.group) annotation in a test class or method comment:
+
+```php
+/**
+ * Netscape bookmark import
+ * @group WIP
+ */
+class BookmarkImportTest extends PHPUnit_Framework_TestCase
+{
+   [...]
+}
+```
+
+To run all tests annotated with `@group WIP`:
+```bash
+$ vendor/bin/phpunit --group WIP tests/
+```