diff --git a/docker/docker-compose.1804.54.yaml b/docker/docker-compose.1804.54.yaml
index d607fb6..eb9c80a 100644
--- a/docker/docker-compose.1804.54.yaml
+++ b/docker/docker-compose.1804.54.yaml
@@ -12,6 +12,7 @@ services:
 
   test:
     image: swift-nio-extras:18.04-5.4
+    command: /bin/bash -xcl "cat /etc/lsb-release && swift -version && swift test -Xswiftc -warnings-as-errors $${SANITIZER_ARG-}"
 
   shell:
     image: swift-nio-extras:18.04-5.4
diff --git a/docker/docker-compose.2004.55.yaml b/docker/docker-compose.2004.55.yaml
index db1e6a5..5b431cf 100644
--- a/docker/docker-compose.2004.55.yaml
+++ b/docker/docker-compose.2004.55.yaml
@@ -11,6 +11,7 @@ services:
 
   test:
     image: swift-nio-extras:20.04-5.5
+    command: /bin/bash -xcl "cat /etc/lsb-release && swift -version && swift test -Xswiftc -warnings-as-errors $${SANITIZER_ARG-}"
 
   shell:
     image: swift-nio-extras:20.04-5.5
diff --git a/docker/docker-compose.yaml b/docker/docker-compose.yaml
index d481383..06b042b 100644
--- a/docker/docker-compose.yaml
+++ b/docker/docker-compose.yaml
@@ -28,7 +28,7 @@ services:
 
   test:
     <<: *common
-    command: /bin/bash -xcl "cat /etc/lsb-release && swift -version && swift test -Xswiftc -warnings-as-errors $${SANITIZER_ARG-}"
+    command: /bin/bash -xcl "cat /etc/lsb-release && swift -version && swift test -Xswiftc -warnings-as-errors --enable-test-discovery $${SANITIZER_ARG-}"
 
   # util