tweak the code of getting last session, without splice events array

test/machine.test.ts

@@ -0,0 +1,19 @@
+import { expect } from 'chai';
+import { getLastSession } from '../src/replay/machine';
+import { sampleEvents } from './utils';
+import { EventType } from '../src/types';
+
+const events = sampleEvents.filter(
+  (e) => ![EventType.DomContentLoaded, EventType.Load].includes(e.type),
+);
+
+describe('get last session', () => {
+  it('will return all the events when there is only one session', () => {
+    expect(getLastSession(events)).to.deep.equal(events);
+  });
+
+  it('will return last session when there is more than one in the events', () => {
+    const multiple = events.concat(events).concat(events);
+    expect(getLastSession(multiple)).to.deep.equal(events);
+  });
+});