package catalogue

import (
	"testing"
)

// Where the answer to a requirement is allowed to live.
//
// A shell, a display server and a private network have to be on the machine that needs them. A
// database does not — it runs somewhere and is reached over the network. Both were written
// `requires`, so both were answered the same way, and the second answer was to install PostgreSQL
// on every machine that runs a web application.

// onNetwork is a set of providers, all of them reachable. Written as a helper because a machine
// that cannot reach the one answering its requirement is its own case, tested separately.
// reachable is this machine, on the private network.
func reachable() Node {
	n := workstation()
	n.At = "workstation.internal"
	return n
}

func TestTheShortFormStillMeansHere(t *testing.T) {
	// `"provides": ["shell"]` must keep meaning what it meant, or every existing manifest
	// silently changes meaning.
	m, err := decodeForTest([]byte(`{"module":"zsh","version":"1","provides":["shell"]}`))
	if err != nil {
		t.Fatal(err)
	}
	if len(m.Provides) != 1 || m.Provides[0].At() != ScopeNode {
		t.Fatalf("a plain name is no longer node-scoped: %v", m.Provides)
	}
}

// Being told, which is the difference between knowing and being able to.