public function shouldAddDefaultConfigPassedInConstructorWhileCreatingGatewayConfig()
{
$factory = new PaypalRestGatewayFactory(['foo' => 'fooVal', 'bar' => 'barVal']);
$config = $factory->createConfig();
$this->assertInternalType('array', $config);
$this->assertArrayHasKey('foo', $config);
$this->assertEquals('fooVal', $config['foo']);
$this->assertArrayHasKey('bar', $config);
$this->assertEquals('barVal', $config['bar']);
}