feat: unify installation model catalog

tools/tht/internal/service/service_test.go

@@ -13,6 +13,7 @@ import (
 
 // Catches --build being ignored, which would run stale images after a checkout update.
 func TestStartBuildsBeforeStartingAndCheckingHealth(t *testing.T) {
+	stubModelProjection(t, nil)
 	runner := &recordingRunner{}
 	installation := testInstallation()
 
@@ -26,6 +27,7 @@ func TestStartBuildsBeforeStartingAndCheckingHealth(t *testing.T) {
 
 // Catches a normal start unnecessarily rebuilding images.
 func TestStartSkipsBuildUnlessRequested(t *testing.T) {
+	stubModelProjection(t, nil)
 	runner := &recordingRunner{}
 	installation := testInstallation()
 
@@ -38,6 +40,7 @@ func TestStartSkipsBuildUnlessRequested(t *testing.T) {
 }
 
 func TestStartRefusesProjectedAuthenticationBeforeComposeWhenNotReady(t *testing.T) {
+	stubModelProjection(t, nil)
 	for _, state := range []string{"missing", "blocked", "divergent"} {
 		t.Run(state, func(t *testing.T) {
 			previous := requireRuntimeAuthProjectionReady
@@ -61,6 +64,26 @@ func TestStartRefusesProjectedAuthenticationBeforeComposeWhenNotReady(t *testing
 	}
 }
 
+func TestStartRefusesProjectionFailureBeforeCompose(t *testing.T) {
+	stubModelProjection(t, errors.New("synthetic projection failure"))
+	runner := &recordingRunner{}
+
+	err := Start(context.Background(), testInstallation(), runner, false)
+	if err == nil || !strings.Contains(err.Error(), "model runtime projection") {
+		t.Fatalf("Start() error = %v", err)
+	}
+	if len(runner.stages) != 0 {
+		t.Fatalf("Start() reached Compose: %v", runner.stages)
+	}
+}
+
+func stubModelProjection(t *testing.T, result error) {
+	t.Helper()
+	previous := generateModelProjections
+	generateModelProjections = func(config.Installation) error { return result }
+	t.Cleanup(func() { generateModelProjections = previous })
+}
+
 type recordingRunner struct{ stages []string }
 
 func (r *recordingRunner) Run(_ context.Context, args []string, _ io.Reader) (compose.Result, error) {