Add tests for xoroshiro generator

;; Tests for RNG

(defpackage :rng-tests

  (:use :cl :lisp-unit))

(in-package "RNG-TESTS")

(defun 64-bit-rng-state (rng)

  (let ((state (kernel::xoro-random-state-state rng)))

    (flet ((convert (x)

	     (multiple-value-bind (hi lo)

		 (kernel:double-float-bits x)

	       (logior (ash (ldb (byte 32 0) hi) 32)

		       lo))))

      (values (convert (aref state 0)) (convert (aref state 1))))))

(defun 64-bit-value (rng)

  (logior (ash (kernel::xoroshiro-chunk rng) 32)

	  (kernel::xoroshiro-chunk rng)))

(defvar *test-state*)

(define-test rng.initial-state

  (setf *test-state*

	(kernel::make-xoroshiro-object :state (kernel::init-xoro-state #x12345678)

				       :rand 0

				       :cached-p nil))

  (multiple-value-bind (s0 s1)

      (64-bit-rng-state *test-state*)

    (assert-equal #x38f1dc39d1906b6f s0)

    (assert-equal #xdfe4142236dd9517 s1)

    (assert-equal 0 (kernel::xoro-random-state-rand *test-state*))

    (assert-equal nil (kernel::xoro-random-state-cached-p *test-state*))))

(define-test rng.values-test

  (assert-equal (list #x38f1dc39d1906b6f #xdfe4142236dd9517)

		(multiple-value-list (64-bit-rng-state *test-state*)))

  (assert-equal 0 (kernel::xoro-random-state-rand *test-state*))

  (assert-equal nil (kernel::xoro-random-state-cached-p *test-state*))

  (dolist (item '((#x18d5f05c086e0086 (#x228f4926843b364d #x74dfe78e715c81be))

		  (#x976f30b4f597b80b (#x5b6bd4558bd96a68 #x567b7f35650aea8f))

		  (#xb1e7538af0e454f7 (#x13e5253e242fac52 #xed380e70d10ab60e))

		  (#x011d33aef53a6260 (#x9d0764952ca00d8a #x5251a5cfedd2b4ef))

		  (#xef590a651a72c279 (#xba4ef2b425bda963 #x172b965cf56c15ac))

		  (#xd17a89111b29bf0f (#x458277a5e5f0a21b #xd1bccfad6564e8d))

		  (#x529e44a0bc46f0a8 (#x2becb68d5a7194c7 #x3a6ec964899bb5f3))

		  (#x665b7ff1e40d4aba (#xededfd481d0a19fe #x3ea213411827fe9d))

		  (#x2c9010893532189b (#xd7bb59bcd8fba26f #x52de763d34fee090))

		  (#x2a99cffa0dfa82ff (#xf96e892c62d6ff2e #xc0542ff85652f81e))))

    (destructuring-bind (value state)

	item

      (assert-equal value (64-bit-value *test-state*))

      (assert-equal state (multiple-value-list (64-bit-rng-state *test-state*))))))