tests: add change user charset integration test

Author: dresende

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

@@ -0,0 +1,17 @@
+var assert = require('assert');
+var common = require('../../common');
+
+common.getTestConnection(function (err, connection) {
+  assert.ifError(err);
+
+  connection.changeUser({charset: 'KOI8R_GENERAL_CI'}, function (err) {
+    assert.ifError(err);
+
+    connection.query('SHOW VARIABLES LIKE \'character_set_client\'', function (err, result) {
+      assert.ifError(err);
+      assert.strictEqual(result[0]['Value'], 'koi8r');
+
+      connection.destroy();
+    });
+  });
+});