test: add test for running as included module

This adds a separate test for checking that the server can
start up when included as a module. The needed package.json and
the test itself are copied into a temporary directory, then
the server install is npm pack'd and installed into the temp
directory. Everything I tried within the server directory
ended up with npm complaining or shortcutting things so
that the test either did not work or tested nothing.

test-server-as-include/package.json

@@ -0,0 +1,8 @@
+{
+  "name": "empty",
+  "version": "1.0.0",
+  "main": "works-as-include.js",
+  "dependencies": {
+    "app-root-path": "^2.1.0"
+  }
+}

test-server-as-include/run.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+TMPDIR=$(mktemp -d)
+
+trap "exit 1"         HUP INT PIPE QUIT TERM
+trap "rm -rf $TMPDIR" EXIT
+
+BASEDIR=$(dirname $0)
+
+#copy test files to the tmp directory
+cp -r ${BASEDIR} $TMPDIR
+
+#pack the server and install from the packed tar file
+ORIGINDIR=$(PWD)
+PACKEDTARFILE=$(npm pack 2>/dev/null)
+cd $TMPDIR/$BASEDIR
+npm install
+npm install $ORIGINDIR/$PACKEDTARFILE
+
+export SETTINGSDIR=$TMPDIR/settings
+mkdir $SETTINGSDIR
+
+node works-as-include.js
+

test-server-as-include/works-as-include.js

@@ -0,0 +1,12 @@
+const appRoot = require('app-root-path')
+const SignalKServer = require('signalk-server')
+const path = require('path')
+
+const config = {
+  appPath: appRoot.path,
+  configPath: process.env.SETTINGSDIR
+}
+
+console.log(config)
+const server = new SignalKServer({ config });
+server.start()