Push: Initial push

internal/ui/navigation/navigator_test.go

@@ -0,0 +1,170 @@
+package navigation_test
+
+import (
+	"testing"
+
+	"github.com/nebara/nebara-os/internal/model"
+	"github.com/nebara/nebara-os/internal/ui/navigation"
+)
+
+func sampleItems() []model.MenuItem {
+	return []model.MenuItem{
+		{Label: "Item A", Description: "Desc A", Children: []model.MenuItem{
+			{Label: "Child A1", Description: "Desc A1"},
+			{Label: "Child A2", Description: "Desc A2"},
+		}},
+		{Label: "Item B", Description: "Desc B"},
+		{Label: "Item C", Description: "Desc C"},
+	}
+}
+
+func TestNewNavigator_InitialIndex(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 1)
+	if nav.Current().SelectedIdx != 1 {
+		t.Errorf("expected initial index 1, got %d", nav.Current().SelectedIdx)
+	}
+}
+
+func TestNewNavigator_InvalidIndex(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 99)
+	if nav.Current().SelectedIdx != 0 {
+		t.Errorf("out-of-range index should clamp to 0, got %d", nav.Current().SelectedIdx)
+	}
+}
+
+func TestMoveDown(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 0)
+	nav.MoveDown()
+	if nav.Current().SelectedIdx != 1 {
+		t.Errorf("expected index 1 after MoveDown, got %d", nav.Current().SelectedIdx)
+	}
+}
+
+func TestMoveDown_Clamps(t *testing.T) {
+	items := sampleItems()
+	nav := navigation.NewNavigator(items, len(items)-1)
+	nav.MoveDown()
+	if nav.Current().SelectedIdx != len(items)-1 {
+		t.Errorf("MoveDown should clamp at last item")
+	}
+}
+
+func TestMoveUp(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 2)
+	nav.MoveUp()
+	if nav.Current().SelectedIdx != 1 {
+		t.Errorf("expected index 1 after MoveUp, got %d", nav.Current().SelectedIdx)
+	}
+}
+
+func TestMoveUp_Clamps(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 0)
+	nav.MoveUp()
+	if nav.Current().SelectedIdx != 0 {
+		t.Errorf("MoveUp should clamp at 0")
+	}
+}
+
+func TestMoveFirst(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 2)
+	nav.MoveFirst()
+	if nav.Current().SelectedIdx != 0 {
+		t.Errorf("MoveFirst should jump to 0")
+	}
+}
+
+func TestMoveLast(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 0)
+	nav.MoveLast()
+	last := len(sampleItems()) - 1
+	if nav.Current().SelectedIdx != last {
+		t.Errorf("MoveLast should jump to %d, got %d", last, nav.Current().SelectedIdx)
+	}
+}
+
+func TestEnter_HasChildren(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 0) // Item A has children
+	ok := nav.Enter()
+	if !ok {
+		t.Fatal("Enter on item with children should return true")
+	}
+	if nav.Depth() != 1 {
+		t.Errorf("expected depth 1, got %d", nav.Depth())
+	}
+	if nav.Current().Items[0].Label != "Child A1" {
+		t.Errorf("expected Child A1, got %s", nav.Current().Items[0].Label)
+	}
+}
+
+func TestEnter_NoChildren(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 1) // Item B has no children
+	ok := nav.Enter()
+	if ok {
+		t.Fatal("Enter on leaf item should return false")
+	}
+	if nav.Depth() != 0 {
+		t.Errorf("depth should remain 0 for leaf enter")
+	}
+}
+
+func TestBack(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 0)
+	nav.Enter()
+	ok := nav.Back()
+	if !ok {
+		t.Fatal("Back from submenu should return true")
+	}
+	if nav.Depth() != 0 {
+		t.Errorf("expected depth 0 after back, got %d", nav.Depth())
+	}
+}
+
+func TestBack_AtRoot(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 0)
+	ok := nav.Back()
+	if ok {
+		t.Fatal("Back at root should return false")
+	}
+}
+
+func TestIsAtRoot(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 0)
+	if !nav.IsAtRoot() {
+		t.Error("should be at root initially")
+	}
+	nav.Enter()
+	if nav.IsAtRoot() {
+		t.Error("should not be at root after Enter")
+	}
+	nav.Back()
+	if !nav.IsAtRoot() {
+		t.Error("should be at root after Back")
+	}
+}
+
+func TestSelectionPreservedAfterBack(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 0)
+	nav.MoveDown() // idx=1
+	nav.MoveDown() // idx=2
+	nav.Back()     // at root, nothing changes
+	if nav.Current().SelectedIdx != 2 {
+		t.Errorf("selection should be 2, got %d", nav.Current().SelectedIdx)
+	}
+	nav.MoveFirst() // idx=0
+	nav.Enter()     // into Item A's children
+	nav.Back()      // back to root, parent should restore idx=0
+	if nav.Current().SelectedIdx != 0 {
+		t.Errorf("after returning from submenu, root selection should be 0, got %d", nav.Current().SelectedIdx)
+	}
+}
+
+func TestBreadcrumbTitle(t *testing.T) {
+	nav := navigation.NewNavigator(sampleItems(), 0)
+	if nav.BreadcrumbTitle() != "" {
+		t.Error("breadcrumb should be empty at root")
+	}
+	nav.Enter()
+	if nav.BreadcrumbTitle() != "Item A" {
+		t.Errorf("breadcrumb should be 'Item A', got %q", nav.BreadcrumbTitle())
+	}
+}