contributing: use `behat --expand`

Without --expand, it's hard to debug failures in scenarion outlines.

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index e4b8ec7..52ce37f 100644 (file)
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -47,7 +47,7 @@ Running the following as root in MySQL should do the trick:
 Finally, to run the tests:
 
     vendor/bin/phpunit
-    vendor/bin/behat
+    vendor/bin/behat --expand
 
 Finally...
 ----------