add test= macro for prettier assertions

sms.fnl

@@ -11,6 +11,15 @@
 
 (local gsm-char (require :unicode-to-gsm))
 
+(macro test= [expr expected]
+  `(let [a# ,expr
+         e# ,expected]
+     (if (not (= a# e#))
+         (assert false (.. "expected " ,(view expr) " = " e#
+                           ", actual " a#)))))
+
+(test= (+ 5 4) 9)
+
 (fn escape-for-logging [s]
   (s:gsub "%c" (fn [x] (.. "{" (string.byte x) "}"))))
 
@@ -51,8 +60,8 @@
   (let [n (if (even? (# number)) number (.. number "F"))]
     (n:gsub ".." (fn [s] (.. (s:sub 2 2) (s:sub 1 1))))))
 
-(assert (=  (phone-number->hex "447000123456") "440700214365"))
-(assert (=  (phone-number->hex "85291234567") "5892214365F7"))
+(test= (phone-number->hex "85291234567") "5892214365F7")
+(test= (phone-number->hex "447785016005") "447758100650")
 
 (fn mask [start end]
   (let [width (+ 1 (- end start))]
@@ -123,7 +132,7 @@
 
 ;; per worked example at https://www.developershome.com/sms/cmgsCommand4.asp
 
-(assert (= (message->pdu "85291234567" "It is easy to send text messages.") "01000B915892214365F7000021493A283D0795C3F33C88FE06CDCB6E32885EC6D341EDF27C1E3E97E72E"))
+(test= (message->pdu "85291234567" "It is easy to send text messages.") "01000B915892214365F7000021493A283D0795C3F33C88FE06CDCB6E32885EC6D341EDF27C1E3E97E72E")
 
 
 (fn command [fd s]
@@ -160,6 +169,4 @@
         (tx "\026\r\n")
         (expect "OK")))))
 
-;(send-sms "447000123456" "It is never {easy} to [send] text messages.")
-
 {  :send send-sms }