diff --git a/tests.toml b/tests.toml
index 0825f69..b233df4 100644
--- a/tests.toml
+++ b/tests.toml
@@ -6,5 +6,9 @@ test_format = 1.0
     # Default args to use for install
     # -------------------------------
 
-    args.dex_domain="sub.domain.tld"
-    args.dex_path="/example"
\ No newline at end of file
+    args.dex_domain="dex.domain.tld"
+    args.dex_path="/example"
+
+    preinstall = """
+    sudo yunohost domain add dex.domain.tld
+    """
\ No newline at end of file