[Fix] nvm ls, nvm alias, nvm install: error when an LTS name is invalid

test/fast/Unit tests/nvm install with nonlowercase LTS name

@@ -0,0 +1,35 @@
+#!/bin/sh
+
+die () { echo "$@" ; exit 1; }
+
+\. ../../../nvm.sh
+
+REMOTE="${PWD}/mocks/nvm_ls_remote.txt"
+REMOTE_IOJS="${PWD}/mocks/nvm_ls_remote_iojs.txt"
+
+nvm_download() {
+  if [ "$*" = "-L -s $(nvm_get_mirror node std)/index.tab -o -" ]; then
+    cat "${REMOTE}"
+  elif [ "$*" = "-L -s $(nvm_get_mirror iojs)/index.tab -o -" ]; then
+    cat "${REMOTE_IOJS}"
+  else
+    nvm_err "unknown nvm_download call: $*"
+    return 42
+  fi
+}
+
+nvm_install_binary() {
+  return 42
+}
+nvm_install_source() {
+  return 42
+}
+
+ACTUAL="$(nvm install lts/ARGON 2>&1)"
+EXIT_CODE=$?
+[ $EXIT_CODE -eq 3 ] || die "Expected exit code of 3, got ${EXIT_CODE}"
+
+EXPECTED="LTS names must be lowercase
+Version with LTS filter 'ARGON' not found - try \`nvm ls-remote --lts=ARGON\` to browse available versions."
+
+[ "${ACTUAL}" = "${EXPECTED}" ] || die "Expected >${EXPECTED}<, got >${ACTUAL}<"