Use NODE_ENV to test for test environment; improve scripts

npm

@@ -1,3 +1,13 @@
 #!/usr/bin/env bash
 
-docker run --rm --init -it -v $PWD:/usr/src/app -u $(id -u):$(id -u) -p 8080:8080 btroops npm $@
+user_id=$(id -u)
+image=btroops
+
+if [[ $1 == run && $2 == test* ]]
+then
+  port=3005
+else
+  port=8080
+fi
+
+docker run --rm --init -it -v $PWD:/usr/src/app -u $user_id:$user_id -p $port:$port $image npm $@