If I write a bunch of tests for new code, and all of them pass on the first attempt, I'm immediately suspicious of a far more egregious bug hiding somewhere…

Where feasible, I like to start a suite with a unit test that validates the unit's intended side effects actually occur, as visible in their mocks being exercised.

"never trust a test you've never seen fail." has kept me honest on more than one occasion.

// Todo: remove

return true;