feat: add navigation and window size handlers with corresponding tests

internal/handlers/helpHander_test.go

@@ -0,0 +1,101 @@
+package handlers_test
+
+import (
+	"slices"
+	"testing"
+
+	"github.com/StevanFreeborn/term-tier/internal/handlers"
+	"github.com/StevanFreeborn/term-tier/internal/state"
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+func TestNewHelpHandler(t *testing.T) {
+	h := handlers.NewHelpHandler()
+
+	if h.Description() != "Toggle help menu" {
+		t.Errorf("Expected description 'Toggle help menu', got %q", h.Description())
+	}
+
+	keys := h.KeysHandled()
+
+	if !slices.Contains(keys, "?") {
+		t.Errorf("Expected keys ['?'], got %v", keys)
+	}
+}
+
+func TestHelpHandler_Match(t *testing.T) {
+	h := handlers.NewHelpHandler()
+
+	tests := []struct {
+		name     string
+		mode     state.Mode
+		key      string
+		expected bool
+	}{
+		{
+			name:     "Matches '?' in Navigation Mode",
+			mode:     state.NavigationMode,
+			key:      "?",
+			expected: true,
+		},
+		{
+			name:     "Matches '?' in Help Mode",
+			mode:     state.HelpMode,
+			key:      "?",
+			expected: true,
+		},
+		{
+			name:     "Ignores '?' in Input Mode",
+			mode:     state.InputMode,
+			key:      "?",
+			expected: false,
+		},
+		{
+			name:     "Ignores other keys in Navigation Mode",
+			mode:     state.NavigationMode,
+			key:      "q",
+			expected: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			s := state.New(state.WithMode(tt.mode))
+			msg := tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune(tt.key)}
+
+			if got := h.Match(s, msg); got != tt.expected {
+				t.Errorf("Match() = %v, want %v", got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestHelpHandler_Handle(t *testing.T) {
+	h := handlers.NewHelpHandler()
+
+	t.Run("Toggles from Navigation to Help", func(t *testing.T) {
+		s := state.New(state.WithMode(state.NavigationMode))
+		msg := tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune("?")}
+
+		cmd := h.Handle(s, msg)
+
+		if s.Mode() != state.HelpMode {
+			t.Errorf("Expected mode to switch to HelpMode, got %v", s.Mode())
+		}
+
+		if cmd != nil {
+			t.Error("Expected nil command, got non-nil")
+		}
+	})
+
+	t.Run("Toggles from Help to Navigation", func(t *testing.T) {
+		s := state.New(state.WithMode(state.HelpMode))
+		msg := tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune("?")}
+
+		h.Handle(s, msg)
+
+		if s.Mode() != state.NavigationMode {
+			t.Errorf("Expected mode to switch to NavigationMode, got %v", s.Mode())
+		}
+	})
+}