Access Manager (#4416)

Co-authored-by: Ernesto García <ernestognw@gmail.com>
Co-authored-by: Francisco Giordano <fg@frang.io>

test/helpers/methods.js

@@ -0,0 +1,5 @@
+const { soliditySha3 } = require('web3-utils');
+
+module.exports = {
+  selector: signature => soliditySha3(signature).substring(0, 10),
+};