Never fail to keep a promise. Always have a backup plan in case you can't make a meeting, phone call date, or other promised engagement. As I said, you know how to do this. It's simple courtesy. If you are let down, then you have to go back and try again.
Testing is part of the game.
You will get tested. Just don't waver from your position of determination to engage in interethnic, interracial collaborative work. The rewards may not be seen immediately, but the payoff is beyond measure when you succeed. In my first interracial collaborative work experience, I was determined to learn how my whiteness gets in the way of achieving common goals. And I faced the challenge of acknowledging then learning to use white privilege to a greater human advantage, in common cause with friends, colleagues, collaborators in those respective communities.