Improved test config

tests/README.md

@@ -38,4 +38,14 @@ PHPUnit configuration is in `phpunit.xml.dist` in repository root folder.
 You can create your own phpunit.xml to override dist config.
 
 Database and other backend system configuration can be found in `unit/data/config.php`
-adjust them to your needs to allow testing databases and caching in your environment.
\ No newline at end of file
+adjust them to your needs to allow testing databases and caching in your environment.
+You can override configuration values by creating a `config.local.php` file
+and manipulate the `$config` variable.
+For example to change MySQL username and password your `config.local.php` should
+contain the following:
+
+```php
+<?php
+$config['databases']['mysql']['username'] = 'yiitest';
+$config['databases']['mysql']['password'] = 'changeme';
+```

tests/unit/.gitignore

-runtime/cache/*
\ No newline at end of file
+/runtime/cache/*
+/data/config.local.php
\ No newline at end of file

tests/unit/data/config.php

 <?php
-return [
+
+/**
+ * This is the configuration file for the Yii2 unit tests.
+ * You can override configuration values by creating a `config.local.php` file
+ * and manipulate the `$config` variable.
+ * For example to change MySQL username and password your `config.local.php` should
+ * contain the following:
+ *
+<?php
+$config['databases']['mysql']['username'] = 'yiitest';
+$config['databases']['mysql']['password'] = 'changeme';
+
+ */
+
+$config = [
     'databases' => [
         'cubrid' => [
             'dsn' => 'cubrid:dbname=demodb;host=localhost;port=33000',
@@ -58,3 +72,9 @@ return [
         'options' => [],
     ]
 ];
+
+if (is_file(__DIR__ . '/config.local.php')) {
+    include(__DIR__ . '/config.local.php');
+}
+
+return $config;
\ No newline at end of file