Update docs

test/proxy/ERC1967/ERC1967Proxy.test.js

@@ -0,0 +1,13 @@
+const shouldBehaveLikeProxy = require('../Proxy.behaviour');
+
+const ERC1967Proxy = artifacts.require('ERC1967Proxy');
+
+contract('ERC1967Proxy', function (accounts) {
+  const [proxyAdminOwner] = accounts;
+
+  const createProxy = async function (implementation, _admin, initData, opts) {
+    return ERC1967Proxy.new(implementation, initData, opts);
+  };
+
+  shouldBehaveLikeProxy(createProxy, undefined, proxyAdminOwner);
+});