Changed before for beforeAll, refactored Bouncer tests. (#1094)

* Changed before for beforeAll, refactored Bouncer tests.

* Fixed linter errors.

* fix: updates for SignatureBouncer tests and voucher construction

test/proposals/ERC1046/TokenMetadata.test.js

@@ -7,7 +7,7 @@ require('chai')
 const metadataURI = 'https://example.com';
 
 describe('ERC20WithMetadata', function () {
-  before(async function () {
+  beforeEach(async function () {
     this.token = await ERC20WithMetadata.new(metadataURI);
   });