feat(tui): add six-screen Huh wizard for installer input

internal/tui/wizard/wizard_test.go

@@ -0,0 +1,74 @@
+package wizard
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"github.com/MDietermann/ArduinoArchSetup/internal/module"
+	"github.com/MDietermann/ArduinoArchSetup/internal/modules/hello"
+	"github.com/MDietermann/ArduinoArchSetup/internal/tui"
+)
+
+func TestSyncSelected(t *testing.T) {
+	orig := []tui.ModuleChoice{
+		{ID: "a", Selected: false},
+		{ID: "b", Selected: true},
+		{ID: "c", Selected: true},
+	}
+	got := syncSelected(orig, []string{"a", "c"})
+	want := map[string]bool{"a": true, "b": false, "c": true}
+	for _, m := range got {
+		if m.Selected != want[m.ID] {
+			t.Errorf("%s selected=%v, want %v", m.ID, m.Selected, want[m.ID])
+		}
+	}
+	if orig[0].Selected {
+		t.Error("orig mutated")
+	}
+}
+
+func TestRenderPlanWithHello(t *testing.T) {
+	reg := module.NewRegistry()
+	_ = reg.Register(hello.Module{Path: t.TempDir() + "/marker"})
+	out := renderPlan(context.Background(), reg, []string{"hello"})
+	if !strings.Contains(out, "hello") {
+		t.Fatalf("output missing hello: %q", out)
+	}
+}
+
+func TestRenderPlanEmpty(t *testing.T) {
+	if got := renderPlan(context.Background(), module.NewRegistry(), nil); got != "No modules selected." {
+		t.Fatalf("got %q", got)
+	}
+}
+
+func TestParseIntClamp(t *testing.T) {
+	cases := map[string]int{
+		"":    1,
+		"  ":  1,
+		"abc": 1,
+		"0":   1,
+		"-5":  1,
+		"3":   3,
+		"12":  12,
+	}
+	for in, want := range cases {
+		got, _ := parseIntClamp(in, 1)
+		if got != want {
+			t.Errorf("parseIntClamp(%q) = %d, want %d", in, got, want)
+		}
+	}
+}
+
+func TestRunCancelledContextReturnsNoConfirmation(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+	_, confirmed, err := Run(ctx, module.NewRegistry(), tui.WizardState{})
+	if err != nil && err != context.Canceled {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	if confirmed {
+		t.Fatal("confirmed=true on cancelled context")
+	}
+}