mesh-sdk/go/catalogue/several_contributions_test.go

package catalogue

import (
	"encoding/json"
	"testing"
)

// A module may answer one requirement more than once, the sibling of ADR 0094 for `contributes`
// rather than `secrets`: an object store's data API and its console are two different public
// names, not one. `contributes` maps a requirement to several sets of values under local names,
// each reaching the provider as its own entry — the same "several from one" shape ADR 0094 gave
// `secrets`, applied to the other half of an edge.

const twoRoutes = `{"module":"minio","version":"1","requires":["route"],
  "contributes":{"route":{"api":{"label":"files-api","port":9000},"console":{"label":"files","port":9001}}}}`

func TestContributesReadsBothShapesAndWritesThemBack(t *testing.T) {
	m, err := decodeForTest([]byte(twoRoutes))
	if err != nil {
		t.Fatal(err)
	}
	locals := m.ContributesMany["route"]
	if len(locals) != 2 || locals["api"]["label"] != "files-api" || locals["console"]["port"] != float64(9001) {
		t.Fatalf("two contributions under local names: %+v", locals)
	}
	plain, err := decodeForTest([]byte(`{"module":"board","version":"1","requires":["route"],
	  "contributes":{"route":{"label":"board","port":8080}}}`))
	if err != nil {
		t.Fatal(err)
	}
	if got := plain.Contributes["route"]; got["label"] != "board" || len(plain.ContributesMany) != 0 {
		t.Fatalf("the plain shape is one contribution with no local names: %+v / %+v", got, plain.ContributesMany)
	}
	// Written back in the shape it was read, so a built manifest keeps its local names.
	raw, err := json.Marshal(m)
	if err != nil {
		t.Fatal(err)
	}
	again, err := decodeForTest(raw)
	if err != nil {
		t.Fatalf("what was written does not read: %v\n%s", err, raw)
	}
	if len(again.ContributesMany["route"]) != 2 {
		t.Fatalf("the local names did not survive a round trip:\n%s", raw)
	}
}