Add test for #1983 fix

Author: mathiasrw

test/test1983.js

@@ -0,0 +1,27 @@
+if (typeof exports === 'object') {
+	var assert = require('assert');
+	var alasql = require('..');
+}
+
+const test = '1983'; // insert test file number
+
+describe('Test 1983 - multiple statements', function () {
+
+	before(function () {
+		alasql('create database test' + test);
+		alasql('use test' + test);
+		alasql('CREATE TABLE a (anything string);')
+	});
+
+	after(function () {
+		alasql('drop database test' + test);
+	});
+
+	it('USING followed by name', function () {
+		assert.doesNotThrow(() => alasql('SELECT * FROM a a1 JOIN a a2 USING c;'));
+	});
+
+	it('USING followed by name in parathesis', function () {
+		assert.doesNotThrow(() => alasql('SELECT * FROM a a1 JOIN a a2 USING (c);'));
+	});
+});