Check out this Portal 2 Co-op walkthrough and beat Course 5 - Part 2 - Room 02/08 with this online demo.
Are you curious about the humans? It seems some of the last non-testing humans alive tried to secretly imprison other humans and hide their tracks. I think they wanted to punish them by not allowing me to include them into testing. That's why humans couldn't complete these courses. They treat their friends as enemies.
Now you're just wasting my time.
To start preparing for human testing again, I checked an old suggestion box. The number one request: Less deadly tests. That's ridiculous. How do they know for sure the tests are deadly if they could still write the suggestion?