Specify node.js version for travis and add basic test

test/basic.js

@@ -0,0 +1,12 @@
+const assert = require('assert');
+
+describe('Array', function()
+{
+    describe('#indexOf()', function ()
+    {
+        it('should return -1 when the value is not present', function ()
+        {
+            assert.equal([1, 2, 3].indexOf(4), -1);
+        });
+    });
+});