code: func Conditionf(t TestingT, comp assert.Comparison, msg string, args ...interface{}) {
  	if h, ok := t.(tHelper); ok {
  		h.Helper()
  	}
  	if assert.Conditionf(t, comp, msg, args...) {
  		return
  	}
  	t.FailNow()
  }
docs: // Conditionf uses a Comparison to assert a complex condition.