diff --git a/bin/test b/bin/test
new file mode 100755
index 0000000..8c931f0
--- /dev/null
+++ b/bin/test
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+GEMFILES_DIR="$(dirname -- $(dirname -- "${BASH_SOURCE}"))/gemfiles"
+
+for gemfile in "$GEMFILES_DIR"/*.gemfile; do
+  (set -x; BUNDLE_GEMFILE="$gemfile" bundle exec rake test)
+  echo
+done