feat(cli): add apply subcommand

internal/cli/profile_test.go

@@ -0,0 +1,43 @@
+package cli
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestProfileList(t *testing.T) {
+	root := t.TempDir()
+	require.NoError(t, os.MkdirAll(filepath.Join(root, "profiles"), 0o750))
+	require.NoError(t, os.WriteFile(filepath.Join(root, "profiles", "home.yaml"), []byte("name: home\n"), 0o600))
+	require.NoError(t, os.WriteFile(filepath.Join(root, "profiles", "work.yaml"), []byte("name: work\n"), 0o600))
+
+	var buf bytes.Buffer
+	cmd := NewProfile()
+	cmd.SetArgs([]string{"list", "--root", root})
+	cmd.SetOut(&buf)
+	require.NoError(t, cmd.Execute())
+
+	out := buf.String()
+	assert.Contains(t, out, "home")
+	assert.Contains(t, out, "work")
+}
+
+func TestProfileUse(t *testing.T) {
+	root := t.TempDir()
+	require.NoError(t, os.MkdirAll(filepath.Join(root, "profiles"), 0o750))
+	require.NoError(t, os.WriteFile(filepath.Join(root, "profiles", "work.yaml"), []byte("name: work\n"), 0o600))
+	require.NoError(t, os.WriteFile(filepath.Join(root, "config.yaml"), []byte("active_profile: home\n"), 0o600))
+
+	cmd := NewProfile()
+	cmd.SetArgs([]string{"use", "work", "--root", root})
+	require.NoError(t, cmd.Execute())
+
+	body, err := os.ReadFile(filepath.Join(root, "config.yaml"))
+	require.NoError(t, err)
+	assert.Contains(t, string(body), "active_profile: work")
+}