diff --git a/.travis.yml b/.travis.yml
index cb0d8e9..638dbed 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,8 +16,10 @@ before_script:
 script:
   - docker build -t "$image" .
   - ~/official-images/test/run.sh "$image"
-  - if [ -f onbuild/Dockerfile ]; then docker build -t "${image}-onbuild" onbuild; fi
+  - $TRAVIS_BUILD_DIR/test/run.sh "$image"
+  - if [ -f onbuild/Dockerfile ]; then docker build -t "$image-onbuild" onbuild; fi
   - if [ -f onbuild/Dockerfile ]; then ~/official-images/test/run.sh "$image-onbuild"; fi
+  - if [ -f onbuild/Dockerfile ]; then $TRAVIS_BUILD_DIR/test/run.sh "$image-onbuild"; fi
 
 after_script:
   - docker images
diff --git a/test/run.sh b/test/run.sh
new file mode 100755
index 0000000..c2e5a9a
--- /dev/null
+++ b/test/run.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+set -e
+
+docker run --rm \
+    -e SENTRY_SKIP_BACKEND_VALIDATION=1 \
+    -e SENTRY_SECRET_KEY=abc \
+    -e SENTRY_REDIS_HOST=localhost \
+    "$1" config get system.secret-key