Merge pull request #771 from nodejs/fix-image-tests

Fix image tests

test-build.sh

@@ -2,7 +2,7 @@
 #
 # Run a test build for all images.
 
-set -uo pipefail
+set -euo pipefail
 
 . functions.sh
 

test-image.sh

@@ -7,12 +7,12 @@ echo "Test for node succeeded."
 
 if ! npm --version >/dev/null; then
   echo "Test for npm failed!"
-  exit 2
+  exit 1
 fi
 echo "Test for npm succeeded."
 
 if ! yarn --version >/dev/null; then
   echo "Test of yarn failed!"
-  exit 3
+  exit 1
 fi
 echo "Test for yarn succeeded."