feat: add bats tests, docs (#139)

* fix(test): ensure bats file list uses xargs

* docs(readme): use yarn for testing instructions

* fix(test): ensure pipelines fail properly

* docs(alias): fix table header

---------

Signed-off-by: Ismo Vuorinen <ismo@ivuorinen.net>

local/bin/pushover

@@ -56,22 +56,31 @@ __pushover_send_message()
 
   response="$(eval "${curl_cmd}")"
   printf "%s\n" "$response"
-  # TODO: Parse response
-  r="${?}"
-  if [ "${r}" -ne 0 ]; then
-    printf "%s: Failed to send message\n" "${0}" >&2
+
+  # Parse response status. Expect JSON like: {"status":1,"request":"..."}
+  if echo "$response" | grep -q '"status"[[:space:]]*:[[:space:]]*1'; then
+    r=0
+  else
+    r=1
   fi
 
-  return "${r}"
+  if [ "$r" -ne 0 ]; then
+    # Extract possible error message from JSON
+    err=$(echo "$response" | grep -o '"errors".*' | sed 's/"errors"[:,\[]//g' | tr -d '[]"')
+    [ -n "$err" ] && printf "%s: %s\n" "$0" "$err" >&2
+    printf "%s: Failed to send message\n" "$0" >&2
+  fi
+
+  return "$r"
 }
 
-CURL="$(which curl)"
+CURL="$(command -v curl)"
 PUSHOVER_URL="https://api.pushover.net/1/messages.json"
 TOKEN=$PUSHOVER_TOKEN
 USER=$PUSHOVER_USER
 CURL_OPTS=""
-devices="${devices} ${device}"
-optstring="c:d:D:e:f:p:r:t:T:s:u:U:a:h"
+devices=""
+optstring="c:d:D:e:p:r:t:T:s:u:U:a:h"
 
 OPTIND=1
 while getopts ${optstring} c; do
@@ -97,7 +106,7 @@ while getopts ${optstring} c; do
     t)
       title="${OPTARG}"
       ;;
-    k)
+    T)
       TOKEN="${OPTARG}"
       ;;
     s)