diff --git a/test/ecdsa.js b/test/ecdsa.js
new file mode 100644
index 0000000..f315cee
--- /dev/null
+++ b/test/ecdsa.js
@@ -0,0 +1,20 @@
+var assert = require('assert')
+var convert = require('../').convert
+var ecdsa = require('../').ecdsa
+var Message = require('../').Message
+
+describe('ecdsa', function() {
+  describe('recoverPubKey', function() {
+    it('succesfully recovers a public key', function() {
+      var addr = 'mgQK8S6CfSXKjPmnujArSmVxafeJfrZsa3'
+      var signature = convert.base64ToBytes('H0PG6+PUo96UPTJ/DVj8aBU5it+Nuli4YdsLuTMvfJxoHH9Jb7jYTQXCCOX2jrTChD5S1ic3vCrUQHdmB5/sEQY=')
+      var sighex = convert.bytesToHex(signature)
+
+      var hash = Message.getHash('1111')
+      var obj = ecdsa.parseSigCompact(signature)
+      var pubKey = ecdsa.recoverPubKey(obj.r, obj.s, hash, obj.i)
+
+      assert.equal(pubKey.toHex(true), '02e8fcf4d749b35879bc1f3b14b49e67ab7301da3558c5a9b74a54f1e6339c334c')
+    })
+  })
+})