Run tests with CTEST_OUTPUT_ON_FAILURE=1
diff --git a/tests/dockerfiles/Debian_testing.docker b/tests/dockerfiles/Debian_testing.docker
index 6dd688f..99a8d96 100644
--- a/tests/dockerfiles/Debian_testing.docker
+++ b/tests/dockerfiles/Debian_testing.docker
@@ -32,4 +32,4 @@
     make -j $(nproc) && \
     make install && \
     ldconfig && \
-    make test
+    make CTEST_OUTPUT_ON_FAILURE=1 test