[Tests] `nvm alias --lts`: add tests

test/fast/Aliases/lts/"nvm alias" should ensure LTS alias dir exists

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+set -ex
+
+. ../../../../nvm.sh
+. ../../../common.sh
+
+LTS_ALIAS_PATH="$(nvm_alias_path)/lts"
+
+die () { echo $@ ; exit 1; }
+
+[ ! -d "${LTS_ALIAS_PATH}" ] || die "'${LTS_ALIAS_PATH}' exists and should not"
+
+nvm alias >/dev/null 2>&1
+
+[ -d "${LTS_ALIAS_PATH}" ] || die "'${LTS_ALIAS_PATH}' does not exist and should"

test/fast/Aliases/lts/setup_dir

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+. ../../../../nvm.sh
+
+LTS_ALIAS_PATH="$(nvm_alias_path)/lts"
+
+if [ -d "${LTS_ALIAS_PATH}" ]; then
+  mv "${LTS_ALIAS_PATH}" "${LTS_ALIAS_PATH}.bak"
+  rm -rf "${LTS_ALIAS_PATH}"
+fi

test/fast/Aliases/lts/teardown_dir

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+. ../../../../nvm.sh
+
+LTS_ALIAS_PATH="$(nvm_alias_path)/lts"
+
+if [ -d "${LTS_ALIAS_PATH}.bak" ]; then
+  rm -rf "${LTS_ALIAS_PATH}"
+  mv "${LTS_ALIAS_PATH}.bak" "${LTS_ALIAS_PATH}"
+fi