Merge branch 'master' into staging

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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 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 (test-inferior)
+  #:use-module (guix inferior)
+  #:use-module (guix packages)
+  #:use-module (gnu packages)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-64))
+
+(define %top-srcdir
+  (dirname (search-path %load-path "guix.scm")))
+
+(define %top-builddir
+  (dirname (search-path %load-compiled-path "guix.go")))
+
+
+(test-begin "inferior")
+
+(test-equal "open-inferior"
+  '(42 #t)
+  (let ((inferior (open-inferior %top-builddir
+                                 #:command "scripts/guix")))
+    (and (inferior? inferior)
+         (let ((a (inferior-eval '(apply * '(6 7)) inferior))
+               (b (inferior-eval '(@ (gnu packages base) coreutils)
+                                 inferior)))
+           (close-inferior inferior)
+           (list a (inferior-object? b))))))
+
+(test-equal "inferior-packages"
+  (take (sort (fold-packages (lambda (package lst)
+                               (alist-cons (package-name package)
+                                           (package-version package)
+                                           lst))
+                             '())
+              (lambda (x y)
+                (string<? (car x) (car y))))
+        10)
+  (let* ((inferior (open-inferior %top-builddir
+                                  #:command "scripts/guix"))
+         (packages (inferior-packages inferior)))
+    (and (every string? (map inferior-package-synopsis packages))
+         (begin
+           (close-inferior inferior)
+           (take (sort (map (lambda (package)
+                              (cons (inferior-package-name package)
+                                    (inferior-package-version package)))
+                            packages)
+                       (lambda (x y)
+                         (string<? (car x) (car y))))
+                 10)))))
+
+(test-end "inferior")