use stricter error checking in uncached-npm-install.sh

cvrebert · cvrebert · commit 065fe98a29b1 · 2014-03-12T13:50:11.000-07:00
Closes twbs#13045
diff --git a/test-infra/uncached-npm-install.sh b/test-infra/uncached-npm-install.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -e
 cp test-infra/npm-shrinkwrap.canonical.json npm-shrinkwrap.json
 npm install
 rm npm-shrinkwrap.json
