The context of the following conversation is Kendall developed and tested a theory, despite years of being mocked by their colleagues.:
Kendall says My theory worked..
The friend responds You tested it?.
Kendall responds Yes, after years of being mocked by my colleagues, I've proved them wrong..
The friend responds I'm so proud of you.  You never gave up..
Kendall responds It took years, but I finally did it..
The friend responds We need to go out and celebrate..