scm: add some unit-tests

Some basic unit tests. More will follow.

scm/mu-scm-test.scm

@@ -0,0 +1,76 @@
+;; unit tests
+
+(use-modules (mu) (srfi srfi-64))
+
+(define (test-basic)
+  (test-begin "test-basic")
+
+  (test-equal "mcount" 19 (mcount))
+  (test-equal "cfind" 29 (length (cfind "")))
+  (test-equal "mfind" 19 (length (mfind "")))
+
+  (test-end "test-basic"))
+
+(define (test-basic-mfind)
+
+  (test-begin "test-basic-mfind")
+
+  (let ((msg (car (mfind ""))))
+    ;; size
+    (test-equal 490 (size msg))
+    ;; message-id
+    (test-equal "abcd$efgh@example.com" (message-id msg))
+    ;; subject
+    (test-equal "Greetings from Lothlórien" (subject msg))
+    ;; from
+    (test-equal 1 (length (from msg)))
+    (let ((sender (car (from msg))))
+      (test-equal "Frodo Baggins" (assoc-ref sender 'name))
+      (test-equal "frodo@example.com" (assoc-ref sender 'email)))
+    ;; to
+    (test-equal 1 (length (to msg)))
+    (let ((recip (car (to msg))))
+      (test-equal "Bilbo Baggins" (assoc-ref recip 'name))
+      (test-equal "bilbo@anotherexample.com" (assoc-ref recip 'email)))
+
+    ;; no date
+    (test-assert (not (date msg)))
+
+    ;; flags
+    (test-equal '(unread) (flags msg))
+    (test-assert (unread? msg))
+    (test-assert (not (seen? msg)))
+    (test-assert (not (new? msg))))
+
+  (test-end "test-basic-mfind"))
+
+(define (test-mfind)
+  (test-begin "test-mfind")
+  (let ((msg (car (mfind "" #:sort-field 'date #:reverse? #t))))
+
+    (test-equal "test with multi to and cc" (subject msg) )
+    (test-equal "2016-05-15T16:57:25" (time-t->iso-date (date msg))))
+
+  (test-end "test-mfind"))
+
+(define (test-helpers)
+  (test-begin "test-helpers")
+  (test-equal 1750077792 (iso-date->time-t "2025-06-16T12:43:12"))
+  (test-equal 1750075200 (iso-date->time-t "2025-06-16T12"))
+
+  (test-equal "2025-06-16T12:43:12" (time-t->iso-date 1750077792))
+  (test-equal "                   " (time-t->iso-date #f))
+  (test-end "test-helpers"))
+
+(define* (main _ #:rest args)
+  (let ((runner (test-runner-simple)))
+    (test-with-runner runner
+      (test-begin "mu-scm-tests")
+
+      (test-basic)
+      (test-basic-mfind)
+      (test-mfind)
+      (test-helpers)
+
+      (test-end "mu-scm-tests")
+      (exit (test-runner-fail-count runner)))))