Merge pull request #171 from heroku/err-on-npm-install-failure

test and implementation to show error on failed npm version bootstrap

bin/compile

@@ -104,7 +104,7 @@ if [ "$npm_engine" != "" ]; then
     info "npm `npm --version` already installed with node"
   else
     info "Downloading and installing npm $npm_engine (replacing version `npm --version`)..."
-    npm install --quiet -g npm@$npm_engine > /dev/null 2>&1 | indent
+    npm install --quiet -g npm@$npm_engine 2>&1 >/dev/null | indent
   fi
 fi
 

bin/test

@@ -54,6 +54,12 @@ testOldNpm() {
   assertCapturedSuccess
 }
 
+testNonexistentNpm() {
+  compile "nonexistent-npm"
+  assertCaptured "version not found: npm@1.1.65"
+  assertCapturedError 1 ""
+}
+
 testSameNpm() {
   compile "same-npm"
   assertCaptured "npm 1.4.28 already installed"