diff --git a/app/config/config_test.yml b/app/config/config_test.yml
index cdbd61ccb..286054135 100644
--- a/app/config/config_test.yml
+++ b/app/config/config_test.yml
@@ -1,6 +1,13 @@
 imports:
     - { resource: config_dev.yml }
 
+parameters:
+    # It's recommended to use a separate database for tests. This allows to have a
+    # fixed and known set of data fixtures, it simplifies the code of tests and it
+    # makes them more robust.
+    # In this case we just need to define a different path for the application database.
+    env(DATABASE_URL): 'sqlite:///%kernel.project_dir%/var/data/blog_test.sqlite'
+
 framework:
     test: ~
     session:
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 56b46aa0a..04d542ede 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -10,7 +10,6 @@
     <php>
         <ini name="error_reporting" value="-1" />
         <server name="KERNEL_DIR" value="app/" />
-        <env name="DATABASE_URL" value="sqlite:///var/data/blog_test.sqlite"/>
     </php>
 
     <testsuites>