tests: Add post tests.

* tests/post.scm: New file.
* Makefile.am (TESTS): Add it.

Makefile.am

@@ -70,6 +70,7 @@ SOURCES +=					\
 endif
 
 TESTS =						\
+  tests/post.scm				\
   tests/utils.scm
 
 TEST_EXTENSIONS = .scm

tests/post.scm

@@ -0,0 +1,71 @@
+;;; Haunt --- Static site generator for GNU Guile
+;;; Copyright © 2015 David Thompson <davet@gnu.org>
+;;;
+;;; This file is part of Haunt.
+;;;
+;;; Haunt 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.
+;;;
+;;; Haunt 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 Haunt.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (test-post)
+  #:use-module (srfi srfi-19)
+  #:use-module (srfi srfi-64)
+  #:use-module (haunt post))
+
+(test-begin "post")
+
+(define (make-date* year month day)
+  (make-date 0 0 0 0 day month year 0))
+
+(test-equal "post-ref"
+  '(hello test)
+  (post-ref (make-post "foo.skr" '((tags hello test)) '()) 'tags))
+
+(test-equal "post-slug"
+  "hello-world"
+  (post-slug (make-post "foo.skr" '((title . "Hello, world!")) '())))
+
+(test-equal "post-date, no date metadata"
+  %default-date
+  (post-date (make-post "foo.skr" '() '())))
+
+(let ((date (make-date* 2015 10 15)))
+  (test-equal "post-date, date metadata"
+    date
+    (post-date (make-post "foo.skr" `((date . ,date)) '()))))
+
+(let ((oldest (make-post "foo.skr" `((date . ,(make-date* 2015 10 13))) '()))
+      (newest (make-post "bar.skr" `((date . ,(make-date* 2015 10 15))) '()))
+      (middle (make-post "baz.skr" `((date . ,(make-date* 2015 10 14))) '())))
+  (test-equal "posts/reverse-chronological"
+    (list newest middle oldest)
+    (posts/reverse-chronological (list oldest newest middle))))
+
+(let ((foo-post (make-post "foo.skr" '((tags "foo")) '()))
+      (another-foo-post (make-post "another-foo.skr" '((tags "foo")) '()))
+      (bar-post (make-post "bar.skr" '((tags "bar")) '())))
+  (test-equal "posts/group-by-tag"
+    `(("foo" ,foo-post ,another-foo-post) ("bar" ,bar-post))
+    (posts/group-by-tag (list another-foo-post foo-post bar-post))))
+
+(test-equal "parse-metadata, tags"
+  '("foo" "bar" "baz")
+  (parse-metadata 'tags "foo, bar, baz"))
+
+(test-equal "parse-metadata, date"
+  (make-date 0 0 30 22 15 10 2015 (date-zone-offset (current-date)))
+  (parse-metadata 'date "2015-10-15 22:30"))
+
+(test-end)
+
+
+(exit (zero? (test-runner-fail-count (test-runner-current))))