func (t *T) SetupForDestination(setupFn dstSetupFn) *T {
	t.destinationDeploymentSetup = append(t.destinationDeploymentSetup, setupFn)
	return t
}

func (t *T) hasDestinationSetup() bool {
	return len(t.deploymentPairSetup)+len(t.destinationDeploymentSetup) > 0
}

func (t *T) setupPair(ctx framework.TestContext, from echo.Callers, dsts echo.Services) {

	sources      echo.Instances
	destinations echo.Instances

	destinationFilters []CombinationFilter

	sourceDeploymentSetup      []srcSetupFn
	deploymentPairSetup        []svcPairSetupFn
	destinationDeploymentSetup []dstSetupFn

	cfg *config.Builder
}

// New creates a *T using the given applications as sources and destinations for each subtest.
func New(ctx framework.TestContext, instances echo.Instances) *T {