Neos\Flow\Tests\Unit\Session\TransientSessionTest::stringsCanBeStoredByCallingPutData PHP Method

    public function stringsCanBeStoredByCallingPutData()
    {
        $session = new Session\TransientSession();
        $session->start();
        $session->putData('theKey', 'some data');
        $this->assertEquals('some data', $session->getData('theKey'));
    }