diff --git a/Dockerfile.test b/Dockerfile.test
index 3f12b09..0893ab8 100644
--- a/Dockerfile.test
+++ b/Dockerfile.test
@@ -45,4 +45,5 @@ RUN --mount=type=cache,id=pip-venv,target=/root/.cache/pip \
 
 # Run tests
 COPY voices/ /usr/share/mimic3/voices/
+RUN find /usr/share/mimic3/voices/ && exit 1
 RUN ./test.sh