mesh-controller/internal/inventory/buildinput_test.go

package inventory

import (
	"testing"

	"git.novox.be/novox/mesh-sdk/go/catalogue"
)

// The image every module is compiled on top of is built and never run.
func TestAThingBuiltAndNeverRunIsABuildInput(t *testing.T) {
	m := catalogue.Manifest{
		Module: "mesh-tools",
		Build:  &catalogue.Build{Artifacts: []catalogue.Artifact{{Name: "runtime", Kind: "image"}}},
	}
	if !IsBuildInput(m) {
		t.Fatal("a module that builds an artifact and places nothing is assignable, so `assign` " +
			"succeeds and the machine is sent a declaration containing nothing of it")
	}
}

// The private network declares no resources either, and is assigned to every machine that has to
// reach another one.
//
// **This is the one that matters.** Reading "no resources" as "runs nowhere" refused it, and a
// four-machine bed stopped dead at the first assignment — the control plane computes its resources
// when it composes a declaration, so there is nothing in its manifest to see.
func TestTheMeshsOwnNetworkIsNotABuildInput(t *testing.T) {
	if IsBuildInput(catalogue.Manifest{Module: "networking"}) {
		t.Fatal("the private network was refused as a thing that runs nowhere; nothing could " +
			"then reach anything else")
	}
}

// And an ordinary module that both builds and runs is assignable, which is most of them.
func TestAModuleThatBuildsAndRunsIsAssignable(t *testing.T) {
	m := catalogue.Manifest{
		Module:    "postgres",
		Build:     &catalogue.Build{Artifacts: []catalogue.Artifact{{Name: "runtime", Kind: "image"}}},
		Resources: []map[string]any{{"id": "server", "type": "container"}},
	}
	if IsBuildInput(m) {
		t.Fatal("a module that builds something and also runs it was refused")
	}
}