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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 &`
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