How to test private properties.

SomeTest.php

    public function test_setResource()
    {
        $connection = new \Connection();
        $originalName = 'ThisIsMyResource';
        $connection->setResource($originalName);
        $reflection = new \ReflectionClass('Connection');
        $propertyRef = $reflection->getProperty('_resource');
        $propertyRef->setAccessible(TRUE);
        $resourceName = $propertyRef->getValue($connection);
        $this->assertEquals($originalName, $resourceName);
    }