package bootstrap

import (
	"strings"
	"testing"
)

// An installer that carries a builder and was told nothing refuses, and says what is missing.
//
// **Exercised rather than assumed.** This is the refusal that stands between a person and a
// machine left holding a store, a broker and no control plane — the failure the whole preflight
// exists to prevent — and a refusal nothing tests is a refusal nobody has read.
func TestAnInstallerWithNothingToBuildRefuses(t *testing.T) {
	err := Source{}.Check()
	if err == nil {
		t.Fatal("a source naming no repository was accepted; nothing would have been built")
	}
	for _, want := range []string{"--source", "--source-ref"} {
		if !strings.Contains(err.Error(), want) {
			t.Errorf("the refusal does not name %s, so it does not say how to fix it: %v", want, err)
		}
	}
}

// A repository without a commit refuses too, because a branch is somebody else's moving target.
func TestABranchIsNotACommit(t *testing.T) {
	err := Source{Repository: "https://example.invalid/mesh-control.git"}.Check()
	if err == nil {
		t.Fatal("a source with no ref was accepted; genesis would have built whatever a branch pointed at")
	}
	if !strings.Contains(err.Error(), "--source-ref") {
		t.Errorf("the refusal does not name the flag that fixes it: %v", err)
	}
}

// And a repository with a commit is enough.
func TestARepositoryAndACommitIsEnough(t *testing.T) {
	if err := (Source{Repository: "https://example.invalid/mesh-control.git", Ref: "a1b2c3d4"}).Check(); err != nil {
		t.Fatalf("a repository and a commit were refused: %v", err)
	}
}