I haven't come across "test something free", but "try something free" is OK to me; "free" functions as an adverb in that.
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teechrI haven't come across "test something free"...As it happens, I remember seeing for a quite a while an advertisement from the Wall Street Institute saying "Test your English free". At the time it made me quite certain that this is not a place where I would like to test or learn my English. But perhaps I was just out of touch with the latest language tren