Add test for opening existing SQL file and typing text into it (#5816)

* Add test for opening existing SQL file and typing text into it

* Clean up

* More cleanup, remove unneeded queryEditor and add smoke test scripts

* Update comments to be clearer

scripts/test-smoke.bat

@@ -0,0 +1,10 @@
+@echo off
+setlocal
+
+pushd "%~dp0\..\test\smoke"
+
+node test\index.js %*
+
+popd
+
+endlocal

scripts/test-smoke.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+set -e
+
+if [[ "$OSTYPE" == "darwin"* ]]; then
+	realpath() { [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"; }
+	ROOT=$(dirname $(dirname $(realpath "$0")))
+else
+	ROOT=$(dirname $(dirname $(readlink -f $0)))
+fi
+
+cd $ROOT/test/smoke
+
+node test/index.js "$@"