mesh-controller/internal/catalogue/contribution_dependencies_test.go

package catalogue

import (
	"reflect"
	"strings"
	"testing"
)

// Defends novox/hq ADR 0210 §3: a contribution is a dependency on the seat that receives it.

func TestAContributionDependsOnTheSeatThatPlacesIt(t *testing.T) {
	env := mod("theme", nil, nil, nil)
	env.Environment = &Environment{Variables: map[string]string{"GTK_THEME": "Adwaita:dark"}}
	path := mod("toolchain", nil, nil, nil)
	path.Environment = &Environment{Path: []PathEntry{{Entry: "/opt/x/bin"}}}
	shell := mod("prompt", nil, nil, nil)
	shell.Shell = []ShellCode{{For: "zsh", Slot: "first", Code: "true"}}
	session := mod("wallpaper", nil, nil, nil)
	session.Shell = []ShellCode{{For: "xinitrc", Slot: "normal", Code: "true"}}
	resources := mod("bar", nil, nil, nil)
	resources.Shell = []ShellCode{{For: "xresources", Slot: "normal", Code: "x: y"}}
	empty := mod("nothing", nil, nil, nil)
	empty.Environment = &Environment{}

	cases := map[string]struct {
		m    Manifest
		want []string
	}{
		"a variable":                {env, []string{EnvironmentSeat}},
		"a path entry":              {path, []string{EnvironmentSeat}},
		"shell code":                {shell, []string{LoginShellSeat}},
		"the session's start":       {session, []string{DisplayServerSeat}},
		"the session's X resources": {resources, []string{DisplayServerSeat}},
		"an empty environment":      {empty, nil},
	}
	for name, c := range cases {
		got := DependsOn(c.m)
		if len(got) == 0 {
			got = nil
		}
		if !reflect.DeepEqual(got, c.want) {
			t.Errorf("%s depends on %v, want %v", name, got, c.want)
		}
	}
}

func TestAContributionIsMetByAHolderOnTheNodeAndRefusedWithout(t *testing.T) {
	holder := mod("node-env", nil, nil, nil, Claim{Name: EnvironmentSeat})
	contributor := mod("theme", nil, nil, nil)
	contributor.Environment = &Environment{Variables: map[string]string{"GTK_THEME": "Adwaita:dark"}}
	catalogue := map[string]Manifest{"node-env": holder, "theme": contributor}

	if _, err := AssignRefusal(catalogue, "laptop", []string{"node-env"}, []string{"theme"}); err != nil {
		t.Fatalf("a contributor beside the holder is refused: %v", err)
	}
	_, err := AssignRefusal(catalogue, "laptop", nil, []string{"theme"})
	if err == nil {
		t.Fatal("a contributor on a node without the holder was accepted, and its contribution would be written nowhere")
	}
	if !strings.Contains(err.Error(), EnvironmentSeat) || !strings.Contains(err.Error(), "node-env") {
		t.Errorf("the refusal names neither the seat nor its holder: %v", err)
	}
	if _, err := AssignRefusal(catalogue, "laptop", nil, []string{"theme", "node-env"}); err != nil {
		t.Errorf("the contributor and the holder assigned together are refused: %v", err)
	}
}

func TestAHolderMeetsItsOwnContribution(t *testing.T) {
	// The display server's module contributes nothing to its own seat today, but the zsh module's
	// environment contributions do go to another seat: a claim meets only the seat it names.
	zsh := mod("zsh", nil, nil, nil, Claim{Name: LoginShellSeat})
	zsh.Shell = []ShellCode{{For: "zsh", Slot: "normal", Code: "true"}}
	zsh.Environment = &Environment{Variables: map[string]string{"EDITOR": "vim"}}
	catalogue := map[string]Manifest{"zsh": zsh,
		"node-env": mod("node-env", nil, nil, nil, Claim{Name: EnvironmentSeat})}
	unheld := UnheldDependencies(catalogue, "laptop", []Manifest{zsh}, nil)
	if len(unheld) != 1 || unheld[0].Seat != EnvironmentSeat {
		t.Errorf("zsh alone: unheld %v, want only %s (its shell code is its own seat's)", unheld, EnvironmentSeat)
	}
}

func TestTwoModulesDeclaringOnePackageAreRefusedBeforeAnythingIsRecorded(t *testing.T) {
	pacman := withResources(mod("pacman", nil, nil, nil, Claim{Name: PackageManagerSeat}),
		res("package", "pacman-contrib"))
	bar := withResources(mod("bar", nil, nil, nil), res("package", "bar"), res("package", "pacman-contrib"))
	other := withResources(mod("other", nil, nil, nil), res("package", "other"))
	catalogue := map[string]Manifest{"pacman": pacman, "bar": bar, "other": other}

	err := CollisionRefusal(catalogue, "laptop", []string{"pacman"}, []string{"bar"})
	if err == nil || !strings.Contains(err.Error(), "pacman-contrib") || !strings.Contains(err.Error(), "bar") {
		t.Fatalf("the second owner of a package was not refused by name: %v", err)
	}
	if err := CollisionRefusal(catalogue, "laptop", []string{"pacman"}, []string{"other"}); err != nil {
		t.Errorf("a module declaring nothing shared is refused: %v", err)
	}
	// A collision already on the node is status's, not a reason to refuse an unrelated assignment.
	if err := CollisionRefusal(catalogue, "laptop", []string{"pacman", "bar"}, []string{"other"}); err != nil {
		t.Errorf("an unrelated assignment is refused for a collision already there: %v", err)
	}
}