pass database connection to phpunit test - php

Question

i am trying to test a function that executes a select statement, but im a bit confused about the way i should pass the connection to this function and how to assert the data.
this is the class with the function i want to test:
class AdProviders {
public $providers = null;
protected $db = null;
function __construct() {
}
function getDbh() {
if ($this->db === null){
$this->db = Slim::getInstance()->db;
}
return $this->db->getConnection();
}
function setDbh($db) {
$this->db = $db;
}
function getProviders() {
if ($this->providers == null){
$DBH = $this->getDbh();
$query = "select * from providers";
$STH = $DBH->query($query);
$STH->setFetchMode(PDO::FETCH_ASSOC);
while($provider = $STH->fetch()) {
$this->providers[$provider['id']] = $provider;
}
}
return $this->providers;
}
}
and this is my test:
require dirname(__FILE__).'/../../src/vendor/autoload.php';
class AdProvidersTest extends PHPUnit_Extensions_Database_TestCase
{
/**
* #return PHPUnit_Extensions_Database_DB_IDatabaseConnection
*/
public function getConnection()
{
$pdo = new PDO('mysql:host=localhost;dbname=testdb', 'root', 'LWw6A$cXvvf');
return $this->createDefaultDBConnection($pdo, 'testdb');
}
/**
* #return PHPUnit_Extensions_Database_DataSet_IDataSet
*/
public function getDataSet()
{
return $this->createXMLDataSet(dirname(__FILE__).'/../dbTest/fixtures/providers.xml');
}
public function testgetProviders_compareResult()
{
$db = $this->getConnection();
$fixture = new AdProviders($db);
$res = $fixture->getProviders();
}
}
when i run the test function now i get the following error:
1) AdProvidersTest::testgetProviders_compareResult
Trying to get property of non-object
why am i getting it? and how can i get the data inside the providers.xml
using the getProviders? thx

Answer 1

You have to change the constructor of AdProviders class to that the PDO instance can be passed to it. Otherwise $fixture = new AdProviders($db); will not work.
Please change
function __construct() {
}
to
function __construct($db) {
$this->db = $db;
}
UPDATE:
I saw that you are not storing a PDO instance in your AdProviders::$db property. If your are passing a PDO instance to your __construct you should also change your method setDbh from
function getDbh() {
if ($this->db === null){
$this->db = Slim::getInstance()->db;
}
return $this->db->getConnection();
}
to
function getDbh() {
if ($this->db === null){
$this->db = Slim::getInstance()->db->getConnection();
}
return $this->db;
}