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In cryptography and the theory of computation, the next-bit test^[1] is a test against pseudo-random number generators. We say that a sequence of bits passes the next bit test for at any position $i$ in the sequence, if an attacker knows the $i$ first bits, he cannot predict the $(i+1)$ st with reasonnable computational power.

Precise statement

Completeness for Yao's test

^ Andrew Chi-Chih Yao. Theory and applications of trapdoor functions. In Proceedings of the 23rd IEEE Symposium on Foundations of Computer Science, 1982.

[1] Andrew Chi-Chih Yao. Theory and applications of trapdoor functions. In Proceedings of the 23rd IEEE Symposium on Foundations of Computer Science, 1982.

[1]