[Fix] `install`: Add missing io.js installation message

Fixes #1988

nvm.sh

@@ -1721,6 +1721,8 @@ nvm_install_binary() {
   local NODE_OR_IOJS
   if [ "${FLAVOR}" = 'node' ]; then
     NODE_OR_IOJS="${FLAVOR}"
+  elif [ "${FLAVOR}" = 'iojs' ]; then
+    NODE_OR_IOJS="io.js"
   fi
   if [ "${NVM_NO_PROGRESS-}" = "1" ]; then
     # --silent, --show-error, use short option as @samrocketman mentions the compatibility issue.

test/installation_iojs/install from binary

@@ -9,9 +9,13 @@ NVM_PREFIXED_TEST_VERSION="iojs-$NVM_TEST_VERSION"
 
 # Remove the stuff we're clobbering.
 [ -e "${NVM_DIR}/versions/io.js/${NVM_TEST_VERSION}" ] && rm -R "${NVM_DIR}/versions/io.js/${NVM_TEST_VERSION}"
+[ -e "${NVM_DIR}/.cache/bin/${NVM_TEST_VERSION}-linux-x64/" ] && rm -R "${NVM_DIR}/.cache/bin/${NVM_TEST_VERSION}-linux-x64/"
 
 # Install from binary
-nvm install $NVM_PREFIXED_TEST_VERSION || die "install $NVM_PREFIXED_TEST_VERSION failed"
+OUTPUT_HEAD="$(2>&1 nvm install --no-progress $NVM_PREFIXED_TEST_VERSION | tac | tail -n 1)" || die "install $NVM_PREFIXED_TEST_VERSION failed"
+EXPECTED_OUTPUT_HEAD="Downloading and installing io.js v1.0.0..."
+
+[ "${OUTPUT_HEAD}" = "${EXPECTED_OUTPUT_HEAD}" ] || die "expected >${EXPECTED_OUTPUT_HEAD}<; got >${OUTPUT_HEAD}<"
 
 # Check
 [ -d "${NVM_DIR}/versions/io.js/${NVM_TEST_VERSION}" ]