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'.test' is a reserved top-level domain not intended for real use in the global DNS. It was defined in June 1999 by RFC 2606, along with .invalid, .localhost, and .example. The TLD was created to provide an address space for private testing (e.g. of code) and for experimentation in areas related to DNS, such that conflict with global DNS can be avoided.
The term ".test" has also been used to refer to a series of example IDN's created for use in ICANN's IDN .test Root-Zone Evaluation in 2007. The series of domain names to be used for this set of tests are "example.test" or its equivalent translated and transliterated into: Arabic, Persian, Chinese (simplified and traditional), Russian, Hindi, Greek, Korean, Yiddish, Japanese and Tamil.