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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 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-services)
+ #:use-module (gnu services)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-26)
+ #:use-module (srfi srfi-34)
+ #:use-module (srfi srfi-64))
+
+(test-begin "services")
+
+(test-equal "fold-services"
+ ;; Make sure 'fold-services' returns the right result. The numbers come
+ ;; from services of type T3; 'xyz 60' comes from the service of type T2,
+ ;; where 60 = 15 × 4 = (1 + 2 + 3 + 4 + 5) × 4.
+ '(initial-value 5 4 3 2 1 xyz 60)
+ (let* ((t1 (service-type (name 't1) (extensions '())
+ (compose concatenate)
+ (extend cons)))
+ (t2 (service-type (name 't2)
+ (extensions
+ (list (service-extension t1
+ (cut list 'xyz <>))))
+ (compose (cut reduce + 0 <>))
+ (extend *)))
+ (t3 (service-type (name 't3)
+ (extensions
+ (list (service-extension t2 identity)
+ (service-extension t1 list)))))
+ (r (fold-services (cons* (service t1 'initial-value)
+ (service t2 4)
+ (map (lambda (x)
+ (service t3 x))
+ (iota 5 1)))
+ #:target-type t1)))
+ (and (eq? (service-kind r) t1)
+ (service-parameters r))))
+
+(test-assert "fold-services, ambiguity"
+ (let* ((t1 (service-type (name 't1) (extensions '())
+ (compose concatenate)
+ (extend cons)))
+ (t2 (service-type (name 't2)
+ (extensions
+ (list (service-extension t1 list)))))
+ (s (service t2 42)))
+ (guard (c ((ambiguous-target-service-error? c)
+ (and (eq? (ambiguous-target-service-error-target-type c)
+ t1)
+ (eq? (ambiguous-target-service-error-service c)
+ s))))
+ (fold-services (list (service t1 'first)
+ (service t1 'second)
+ s)
+ #:target-type t1)
+ #f)))
+
+(test-assert "fold-services, missing target"
+ (let* ((t1 (service-type (name 't1) (extensions '())))
+ (t2 (service-type (name 't2)
+ (extensions
+ (list (service-extension t1 list)))))
+ (s (service t2 42)))
+ (guard (c ((missing-target-service-error? c)
+ (and (eq? (missing-target-service-error-target-type c)
+ t1)
+ (eq? (missing-target-service-error-service c)
+ s))))
+ (fold-services (list s) #:target-type t1)
+ #f)))
+
+(test-end)
+
+
+(exit (= (test-runner-fail-count (test-runner-current)) 0))