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I'll recommend the test by the "Institut für Testforschung und Testentwicklung" in Leipzig: http://www.itt-leipzig.de/static/startseiteeng.html You can find alternatives if you search the Internet for "Wortschatztest".
Nachrichten Leicht is another one that I haven't seen suggested yet.
Does it really help you to know a definite number? Test yourself by reading original texts in various levels from fairy tales to novels and newspapers, then you will know whether your vocabulary is sufficient or not.
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