Add test database credentials to phpunit config to allow local overriding.

phpunit.xml.dist

 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.6/phpunit.xsd"
+        xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.8/phpunit.xsd"
         bootstrap="./tests/Bootstrap.php"
         backupGlobals="false"
         backupStaticAttributes="false"
@@ -23,6 +23,10 @@
     <php>
         <ini name="error_reporting" value="-1" />
         <const name="PHPUNIT_TESTSUITE" value="true"/>
+        <const name="PHPUNIT_DB_HOST" value="127.0.0.1"/>
+        <const name="PHPUNIT_DB_NAME" value="telegrambot"/>
+        <const name="PHPUNIT_DB_USER" value="root"/>
+        <const name="PHPUNIT_DB_PASS" value=""/>
     </php>
     <testsuites>
         <testsuite name="Package Test Suite">

tests/Unit/ConversationTest.php

@@ -34,14 +34,14 @@ class ConversationTest extends TestCase
     protected function setUp()
     {
         $credentials = [
-            'host'     => '127.0.0.1',
-            'user'     => 'root',
-            'password' => '',
-            'database' => 'telegrambot',
+            'host'     => PHPUNIT_DB_HOST,
+            'database' => PHPUNIT_DB_NAME,
+            'user'     => PHPUNIT_DB_USER,
+            'password' => PHPUNIT_DB_PASS,
         ];
 
         $this->telegram = new Telegram('testapikey', 'testbotname');
-        $this->telegram->enableMySQL($credentials);
+        $this->telegram->enableMySql($credentials);
 
         //Make sure we start with an empty DB for each test.
         TestHelpers::emptyDB($credentials);