Reorganize the repo structure (#2503)

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

test/utils/introspection/ERC165.test.js

@@ -0,0 +1,13 @@
+const { shouldSupportInterfaces } = require('./SupportsInterface.behavior');
+
+const ERC165Mock = artifacts.require('ERC165Mock');
+
+contract('ERC165', function (accounts) {
+  beforeEach(async function () {
+    this.mock = await ERC165Mock.new();
+  });
+
+  shouldSupportInterfaces([
+    'ERC165',
+  ]);
+});