feat: begin tui implementation

tests/tui_test.go

@@ -0,0 +1,30 @@
+package tests
+
+import (
+	"strings"
+	"testing"
+
+	"hosts-go/internal/core"
+	"hosts-go/internal/tui"
+
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestModelSelection(t *testing.T) {
+	sample := `127.0.0.1 localhost
+192.168.1.10 example.com`
+	lines := strings.Split(sample, "\n")
+	hf, _, err := core.ParseHostsContent(lines)
+	require.NoError(t, err)
+
+	m := tui.NewModel(hf)
+	require.NotNil(t, m.SelectedEntry())
+	assert.Equal(t, "localhost", m.SelectedEntry().Hostname)
+
+	// Move selection down
+	nm, _ := m.Update(tea.KeyMsg{Type: tea.KeyDown})
+	m = nm.(tui.Model)
+	assert.Equal(t, "example.com", m.SelectedEntry().Hostname)
+}