mesh-controller/cmd/mesh-control/board_test.go

package main

import (
	"strings"
	"testing"
	"time"

	"github.com/novox/mesh-control/internal/inventory"
)

// Refused and failed stay distinct all the way to the page.
//
// **Refused means the machine is exactly as it was and what is wrong is in what was sent; failed
// means it is in a state nobody declared and what is wrong is on the machine.** They are fixed in
// different places, so a page saying "error" for both sends half its readers to the wrong one.
func TestRefusedAndFailedReachThePageAsDifferentThings(t *testing.T) {
	rendered := render(t, viewOf(answers{
		nodes: []inventory.Node{{Name: "anchor"}, {Name: "laptop"}},
		wrong: []inventory.Doing{
			{Node: "anchor", Outcome: "refused", Refused: "not a declaration this host speaks",
				At: time.Now()},
			{Node: "laptop", Outcome: "failed", At: time.Now(),
				Failed: []inventory.FailedResource{{ID: "web.container", Error: "no such image"}}},
		},
	}))
	// The rendered outcome, not the word anywhere on the page: both words appear in the
	// stylesheet, so a plain Contains passes whatever the machine actually said. It did.
	for _, want := range []string{`<span class="outcome refused">refused</span>`,
		`<span class="outcome failed">failed</span>`} {
		if !strings.Contains(rendered, want) {
			t.Fatalf("the page does not distinguish the two — missing %s:\n%s", want, rendered)
		}
	}
	// And the host's own words, which say exactly what it could not accept.
	for _, want := range []string{"not a declaration this host speaks", "web.container", "no such image"} {
		if !strings.Contains(rendered, want) {
			t.Fatalf("the page does not say %q, so a reader must go and ask:\n%s", want, rendered)
		}
	}
}

// Nothing wrong is said, not left blank. An empty page and a well mesh must not look alike.
func TestAWellMeshSaysSoRatherThanShowingNothing(t *testing.T) {
	rendered := render(t, viewOf(answers{nodes: []inventory.Node{{Name: "anchor"}}}))
	for _, want := range []string{
		"Every machine is doing what it was told",
		"Every machine has been heard from",
		"Every module is what its source last had",
	} {
		if !strings.Contains(rendered, want) {
			t.Fatalf("a well mesh does not say %q:\n%s", want, rendered)
		}
	}
}

// A board that cannot reach the mesh must not render an empty page: that says "nothing is wrong"
// in the one situation where nobody can know it.
func TestABoardThatCannotReadTheMeshSaysSo(t *testing.T) {
	rendered := render(t, view{Unreachable: "the store did not answer"})
	if !strings.Contains(rendered, "the store did not answer") {
		t.Fatalf("the reason is not on the page:\n%s", rendered)
	}
	if strings.Contains(rendered, "Every machine is doing what it was told") {
		t.Fatal("a board that could not read the mesh reported that the mesh is well")
	}
}

// Quiet is not broken, and the page says which it is.
func TestQuietIsNotReportedAsBroken(t *testing.T) {
	rendered := render(t, viewOf(answers{
		nodes: []inventory.Node{{Name: "laptop"}},
		quiet: []inventory.Node{{Name: "laptop"}},
	}))
	if !strings.Contains(rendered, "not the same as tried and could not") {
		t.Fatalf("the page does not separate quiet from broken:\n%s", rendered)
	}
	if !strings.Contains(rendered, "Every machine is doing what it was told") {
		t.Fatalf("a quiet machine was counted as broken:\n%s", rendered)
	}
}

// The page renders what a machine said, and a hostile string in it is not markup.
//
// What is on this page comes from machines, and a machine's own words are the whole reason the
// page is useful. They are also the one thing here that nobody in this repository wrote.
func TestWhatAMachineSaidIsNotMarkup(t *testing.T) {
	rendered := render(t, viewOf(answers{
		nodes: []inventory.Node{{Name: "anchor"}},
		wrong: []inventory.Doing{{Node: "anchor", Outcome: "refused",
			Refused: `<script>alert("from the machine")</script>`, At: time.Now()}},
	}))
	if strings.Contains(rendered, "<script>alert") {
		t.Fatalf("a machine's words were rendered as markup:\n%s", rendered)
	}
	if !strings.Contains(rendered, "&lt;script&gt;") {
		t.Fatalf("the words were not shown at all, so the reader cannot see what it said:\n%s", rendered)
	}
}

// A module behind its source names the machines running the old one — the part with consequences.
func TestBeingBehindNamesTheMachinesRunningTheOldOne(t *testing.T) {
	rendered := render(t, viewOf(answers{
		nodes:   []inventory.Node{{Name: "laptop"}},
		behind:  map[string][]string{"web": {"laptop"}},
		sources: map[string]inventory.Source{"web": {BuiltFrom: "aaaaaaaaaa", Head: "bbbbbbbbbb"}},
	}))
	for _, want := range []string{"web", "aaaaaaaa", "bbbbbbbb", "running on laptop"} {
		if !strings.Contains(rendered, want) {
			t.Fatalf("the page does not say %q:\n%s", want, rendered)
		}
	}
}

func render(t *testing.T, v view) string {
	t.Helper()
	var out strings.Builder
	if err := page.Execute(&out, v); err != nil {
		t.Fatal(err)
	}
	return out.String()
}