feat: update event names for OZ standards and test them

test/helpers/expectEvent.js

@@ -0,0 +1,16 @@
+const assert = require('chai').assert;
+
+const inLogs = async (logs, eventName) => {
+  const event = logs.find(e => e.event === eventName);
+  assert.exists(event);
+};
+
+const inTransaction = async (tx, eventName) => {
+  const { logs } = await tx;
+  return inLogs(logs, eventName);
+};
+
+module.exports = {
+  inLogs,
+  inTransaction,
+};