Add cleanup function to test scripts (#863)

test/tests/test_node_hello_http.sh

@@ -6,17 +6,27 @@ ROOT=$(dirname $0)/../..
 
 fn=nodejs-hello-$(date +%N)
 
+cleanup() {
+    log "Cleaning up..."
+    fission env delete --name nodejs || true
+    fission fn delete --name $fn || true
+}
+
+if [ -z "${TEST_NOCLEANUP:-}" ]; then
+    trap cleanup EXIT
+else
+    log "TEST_NOCLEANUP is set; not cleaning up test artifacts afterwards."
+fi
+
 # Create a hello world function in nodejs, test it with an http trigger
 log "Pre-test cleanup"
 fission env delete --name nodejs || true
 
 log "Creating nodejs env"
 fission env create --name nodejs --image fission/node-env
-trap "fission env delete --name nodejs" EXIT
 
 log "Creating function"
 fission fn create --name $fn --env nodejs --code $ROOT/examples/nodejs/hello.js
-trap "fission fn delete --name $fn" EXIT
 
 log "Creating route"
 fission route create --function $fn --url /$fn --method GET