tests: add integration test for change user reset

Author: dresende

test/integration/connection/test-change-user-reset.js

@@ -0,0 +1,22 @@
+var assert = require('assert');
+var common = require('../../common');
+
+common.getTestConnection(function (err, connection) {
+  assert.ifError(err);
+
+  connection.query('SET @custom = 2', assert.ifError);
+
+  connection.query('SELECT @custom', function (err, result) {
+    assert.ifError(err);
+    assert.strictEqual(result[0]['@custom'], 2);
+  });
+
+  connection.changeUser(assert.ifError);
+
+  connection.query('SELECT @custom', function (err, result) {
+    assert.ifError(err);
+    assert.strictEqual(result[0]['@custom'], null);
+  });
+
+  connection.end(assert.ifError);
+});