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diff --git a/tests/generate-tests.lisp b/tests/generate-tests.lisp
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+;; This file is part of eris-cl.
+;; Copyright (C) 2022 Piotr Szarmański
+
+;; eris-cl is free software: you can redistribute it and/or modify it under the
+;; terms of the GNU Lesser General Public License as published by the Free
+;; Software Foundation, either version 3 of the License, or (at your option) any
+;; later versqion.
+
+;; eris-cl is distributed in the hope that it will be useful, but WITHOUT ANY
+;; WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+;; A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License along with
+;; eris-cl. If not, see <https://www.gnu.org/licenses/>.
+
+;; This generates the autogenerated-tests.lisp file. It requires you to tar -xf
+;; the test vectors tarball right in the tests directory.
+;; Also requires the jonathan package in addition to the regular dependencies.
+
+(asdf:load-system :jonathan)
+(defpackage :eris-json-files
+  (:use common-lisp jonathan))
+
+(in-package :eris-json-files)
+(defparameter *json-files* (loop for i from 0 to 12 collecting (format nil "test-vectors/eris-test-vector-positive-~2,'0d.json" i)))
+(defparameter *json-files-negative* (loop for i from 13 to 24 collecting (format nil "test-vectors/eris-test-vector-negative-~2,'0d.json" i)))
+
+
+(defmacro with-json (json &body expr)
+  (alexandria:with-gensyms (json-sym)
+    `(let ((,json-sym (jonathan:parse ,json)))
+       (macrolet ((json (symbol) (list (quote getf) (quote ,json-sym) symbol)))
+         ,@expr))))
+
+(with-open-file (stream "autogenerated-tests.lisp" :direction :output :if-does-not-exist :create :if-exists :supersede)
+  (format stream ";;;; Autogenerated file.~%")
+  (print '(in-package :eris/test) stream)
+  (print '(def-suite* machine-generated-tests :in eris-tests) stream)
+  (map 'nil (lambda (file)
+              (with-json (with-open-file (json-file file)
+                           (alexandria:read-stream-content-into-string json-file))
+                (print `(test ,(intern (format nil "test-~d" (json :|id|)) *package*)
+                          (positive-test ,(json :|urn|) ,(json :|content|) (quote ,(json :|blocks|)) ,(json :|convergence-secret|) ,(json :|block-size|)))
+                       stream)))
+       *json-files*)
+
+  (map 'nil (lambda (file)
+              (with-json (with-open-file (json-file file)
+                           (alexandria:read-stream-content-into-string json-file))
+                (print `(test ,(intern (format nil "test-~d" (json :|id|)) *package*)
+                          (negative-test ,(json :|urn|) (quote ,(json :|blocks|))))
+                       stream)))
+       *json-files-negative*))
+