feat(cli): add apply subcommand

internal/cli/diff_test.go

@@ -0,0 +1,31 @@
+package cli
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/lukaszraczylo/harness-sync/internal/adapter"
+)
+
+func TestDiffInvokesDryRun(t *testing.T) {
+	root := t.TempDir()
+	require.NoError(t, os.WriteFile(filepath.Join(root, "config.yaml"), []byte("active_profile: home\n"), 0o600))
+	require.NoError(t, os.MkdirAll(filepath.Join(root, "profiles"), 0o750))
+	require.NoError(t, os.WriteFile(filepath.Join(root, "profiles", "home.yaml"),
+		[]byte("name: home\ngateway:\n  url: u\n  token: t\n  default_model: m\nmodels:\n  - {id: m}\n"), 0o600))
+
+	reg := adapter.NewRegistry()
+	reg.Register(&detectableAdapter{name: "stub", detect: true})
+
+	var buf bytes.Buffer
+	cmd := NewDiff(reg)
+	cmd.SetOut(&buf)
+	cmd.SetArgs([]string{"--root", root})
+	require.NoError(t, cmd.Execute())
+	assert.Contains(t, buf.String(), "dry-run")
+}