Use `watch` to keepalive stdout while installing.

test/common.sh

@@ -63,3 +63,15 @@ make_fake_iojs() {
     return 3
   }
 }
+
+watch() {
+  $@ &
+  local JOB
+  JOB=$!
+  while true; do sleep 15; echo '* ping *'; done &
+  wait $JOB;
+  local EXIT_CODE
+  EXIT_CODE=$?
+  kill %2;
+  return $EXIT_CODE
+}

test/installation_iojs/install from source

@@ -1,5 +1,7 @@
 #!/bin/sh
 
+. ../common.sh
+
 die () { echo $@ ; exit 1; }
 
 . ../../nvm.sh
@@ -11,7 +13,7 @@ NVM_PREFIXED_TEST_VERSION="iojs-$NVM_TEST_VERSION"
 [ -e ../../versions/io.js/$NVM_TEST_VERSION ] && rm -R ../../versions/io.js/$NVM_TEST_VERSION
 
 # Install from source
-nvm install -s $NVM_PREFIXED_TEST_VERSION || die "'nvm install -s $NVM_PREFIXED_TEST_VERSION' failed"
+(watch nvm install -s $NVM_PREFIXED_TEST_VERSION) || die "'nvm install -s $NVM_PREFIXED_TEST_VERSION' failed"
 
 # Check
 [ -d ../../versions/io.js/$NVM_TEST_VERSION ]