You should always make flashcards of your own for vocabulary practice, but if you tire of the flashcard system and want to test yourself online, here are links to some basic "check-yourself" tests for the chapter vocabulary topics. These work very much like standard flashcards: you simply type or choose the correct word (or article), and the test will tell you whether it's correct or not.
The tests marked "Substantive" practice the identification and spelling of nouns; those marked "Artikel" ask you to specify the correct gendered article (der/die/das) and those marked "Pluralformen" ask you to type the full plural form for nouns. The tests marked "Verben" are for verbs, and "Adjektive" are adjectives. Other tests may appear in certain sections.