add decodePrivate test

Author: klarkc

lib/decodePrivate.test.mjs

@@ -1,6 +1,10 @@
 import test from "ava"
 import decodePrivate from './decodePrivate'
 
+function unecrypt(data) {
+    return data.replace(/\*/g, '')
+}
+
 test.cb('ignore not encrypted msgs', (t) => {
     const data = {
         content: {}
@@ -12,4 +16,26 @@ test.cb('ignore not encrypted msgs', (t) => {
     }
     const sbot = {}
     decodePrivate(sbot)(data, done)
+})
+
+test.cb('decode encrypted msgs', (t) => {
+    t.plan(3)
+    const data = {
+        content: "e*n*cry**p*t*e*dmsg"
+    }
+    const done = (err, d) => {
+        t.is(err, null)
+        t.is(
+            d.content.text,
+            unecrypt(data.content)
+        )
+        t.end()
+    }
+    const sbot = {
+        unbox(cypher, cb) {
+            t.is(cypher, data.content)
+            cb(null, unecrypt(cypher))
+        }
+    }
+    decodePrivate(sbot)(data, done)
 })