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+;;; ccwl --- Concise Common Workflow Language
+;;; Copyright © 2021 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; This file is part of ccwl.
+;;;
+;;; ccwl 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.
+;;;
+;;; ccwl 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 ccwl.  If not, see <https://www.gnu.org/licenses/>.
+
+(use-modules (srfi srfi-64)
+             (srfi srfi-71)
+             (ccwl utils))
+
+(test-begin "utils")
+
+(test-equal "pairify"
+  '((1 . 2) (3 . 4) (5 . 6))
+  (pairify (list 1 2 3 4 5 6)))
+
+(test-equal "plist->alist"
+  '((spam . 1) (ham . 2) (eggs . 3))
+  (plist->alist (list #:spam 1 #:ham 2 #:eggs 3)))
+
+(define plist-ref
+  (@@ (ccwl utils) plist-ref))
+
+(test-equal "plist-ref"
+  2
+  (plist-ref (list #:spam 1 #:ham 2 #:eggs 3)
+             #:ham))
+
+(test-equal "plist-ref with absent key"
+  #f
+  (plist-ref (list #:spam 1 #:ham 2 #:eggs 3)
+             #:foo))
+
+(test-equal "group-keyword-arguments"
+  '(#:spam 1 #:ham (1 2 3) #:eggs (0))
+  ((@@ (ccwl utils) group-keyword-arguments)
+   (list #:spam 1 #:ham 1 2 3 #:eggs 0)
+   (list #:spam)))
+
+;; We cannot use test-equal to compare syntax objects, since
+;; test-equal does not preserve the lexical contexts of the test
+;; expressions.
+(test-assert "unsyntax-keywords"
+  (equal? (list #:ham #'1 #:eggs #'2)
+          ((module-ref (resolve-module '(ccwl utils))
+                       'unsyntax-keywords)
+           (list #'#:ham #'1 #'#:eggs #'2))))
+
+(test-equal "lambda**"
+  '(1 2 123 (1 2 3))
+  ((lambda** (a b #:key foo #:key* bar)
+     (list a b foo bar))
+   1 2 #:foo 123 #:bar 1 2 3))
+
+(test-assert "syntax-lambda**"
+  (equal? (list #'1 #'2 #'123 (list #'1 #'2 #'3))
+          ((syntax-lambda** (a b #:key foo #:key* bar)
+             (list a b foo bar))
+           #'(foo 1 2 #:foo 123 #:bar 1 2 3))))
+
+(test-equal "filter-mapi"
+  '(1 3 5 7 9)
+  (filter-mapi (lambda (item index)
+                 (and (even? index)
+                      (1+ item)))
+               (iota 10)))
+
+(test-equal "mapn"
+  '((0 1 4 9 16)
+    (0 1 8 27 64))
+  (let ((squares cubes (mapn (lambda (n)
+                               (values (expt n 2)
+                                       (expt n 3)))
+                             (iota 5))))
+    (list squares cubes)))
+
+(test-equal "append-mapn"
+  '((0 0 1 1 2 4 3 9 4 16)
+    (0 0 1 1 2 8 3 27 4 64))
+  (let ((squares cubes (append-mapn (lambda (n)
+                                      (values (list n (expt n 2))
+                                              (list n (expt n 3))))
+                                    (iota 5))))
+    (list squares cubes)))
+
+(test-equal "foldn"
+  '(45 285)
+  (let ((sum sum-of-squares
+             (foldn (lambda (n sum sum-of-squares)
+                      (values (+ sum n)
+                              (+ sum-of-squares (expt n 2))))
+                    (iota 10)
+                    0 0)))
+    (list sum sum-of-squares)))
+
+(test-end "utils")