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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 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-swh)
+  #:use-module (guix swh)
+  #:use-module (guix tests http)
+  #:use-module (srfi srfi-64))
+
+;; Test the JSON mapping machinery used in (guix swh).
+
+(define %origin
+  "{ \"id\": 42,
+     \"visits_url\": \"/visits/42\",
+     \"type\": \"git\",
+     \"url\": \"http://example.org/guix.git\" }")
+
+(define %directory-entries
+  "[ { \"name\": \"one\",
+       \"type\": \"regular\",
+       \"length\": 123,
+       \"dir_id\": 1 }
+     { \"name\": \"two\",
+       \"type\": \"regular\",
+       \"length\": 456,
+       \"dir_id\": 2 } ]")
+
+(define-syntax-rule (with-json-result str exp ...)
+  (with-http-server 200 str
+    (parameterize ((%swh-base-url (%local-url)))
+      exp ...)))
+
+(test-begin "swh")
+
+(test-equal "lookup-origin"
+  (list 42 "git" "http://example.org/guix.git")
+  (with-json-result %origin
+    (let ((origin (lookup-origin "http://example.org/guix.git")))
+      (list (origin-id origin)
+            (origin-type origin)
+            (origin-url origin)))))
+
+(test-equal "lookup-origin, not found"
+  #f
+  (with-http-server 404 "Nope."
+    (parameterize ((%swh-base-url (%local-url)))
+      (lookup-origin "http://example.org/whatever"))))
+
+(test-equal "lookup-directory"
+  '(("one" 123) ("two" 456))
+  (with-json-result %directory-entries
+    (map (lambda (entry)
+           (list (directory-entry-name entry)
+                 (directory-entry-length entry)))
+         (lookup-directory "123"))))
+
+(test-end "swh")
+
+;; Local Variables:
+;; eval: (put 'with-json-result 'scheme-indent-function 1)
+;; End:
+