Factorize test suite support in (guix tests).

* guix/tests.scm: New file.
* Makefile.am (noinst_DATA): New variable.
  (GOBJECTS): Add guix/tests.go.
* tests/builders.scm (%store): Use 'open-connection-for-tests'
  from (guix tests).
* tests/derivations.scm: Likewise.
* tests/monads.scm: Likewise.
* tests/packages.scm: Likewise.
* tests/profiles.scm: Likewise.
* tests/union.scm: Likewise.
* tests/gexp.scm: Likewise.
  (guile-for-build): Remove.  Use (%guile-for-build) instead.
* tests/nar.scm (make-random-bytevector, %seed, random-text): Remove.
  (populate-file): Change 'make-random-bytevector' to 'random-bytevector'.
  Use (guix tests).
* tests/store.scm (%seed, random-text): Remove.
  Use (guix tests).

guix/tests.scm

@@ -0,0 +1,70 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix tests)
+  #:use-module (guix store)
+  #:use-module (guix derivations)
+  #:use-module (guix packages)
+  #:use-module (gnu packages bootstrap)
+  #:use-module (srfi srfi-34)
+  #:use-module (rnrs bytevectors)
+  #:export (open-connection-for-tests
+            random-text
+            random-bytevector))
+
+;;; Commentary:
+;;;
+;;; This module provide shared infrastructure for the test suite.  For
+;;; internal use only.
+;;;
+;;; Code:
+
+(define (open-connection-for-tests)
+  "Open a connection to the build daemon for tests purposes and return it."
+  (guard (c ((nix-error? c)
+             (format (current-error-port)
+                     "warning: build daemon error: ~s~%" c)
+             #f))
+    (let ((store (open-connection)))
+      ;; Make sure we build everything by ourselves.
+      (set-build-options store #:use-substitutes? #f)
+
+      ;; Use the bootstrap Guile when running tests, so we don't end up
+      ;; building everything in the temporary test store.
+      (%guile-for-build (package-derivation store %bootstrap-guile))
+
+      store)))
+
+(define %seed
+  (seed->random-state (logxor (getpid) (car (gettimeofday)))))
+
+(define (random-text)
+  "Return the hexadecimal representation of a random number."
+  (number->string (random (expt 2 256) %seed) 16))
+
+(define (random-bytevector n)
+  "Return a random bytevector of N bytes."
+  (let ((bv (make-bytevector n)))
+    (let loop ((i 0))
+      (if (< i n)
+          (begin
+            (bytevector-u8-set! bv i (random 256 %seed))
+            (loop (1+ i)))
+          bv))))
+
+;;; tests.scm ends here