Add --version to test in package managers

cmd/gh-actions-lock/root.go

@@ -117,6 +117,7 @@ $ gh actions-lock --no-fix --json=valid,findings
 # All fields as JSON
 $ gh actions-lock --json
 `),
+		Version: cliVersion(),
 		PreRunE: func(cmd *cobra.Command, args []string) error {
 			if len(args) > 0 {
 				opts.workflowPaths = args

cmd/gh-actions-lock/root_test.go

@@ -1,7 +1,12 @@
 package main
 
 import (
+	"bytes"
+	"strings"
 	"testing"
+
+	"github.com/github/gh-actions-lock/internal/pinpool"
+	"github.com/github/gh-actions-lock/internal/resolve"
 )
 
 func TestNewRootCmdSuppressesCobraUsageForHandledErrors(t *testing.T) {
@@ -10,3 +15,35 @@ func TestNewRootCmdSuppressesCobraUsageForHandledErrors(t *testing.T) {
 		t.Fatalf("expected root command to suppress Cobra usage/errors for handled failures")
 	}
 }
+
+func TestNewRootCmd_Version(t *testing.T) {
+	var stdout, stderr bytes.Buffer
+	cmd := newRootCmd(func(string, *pinpool.Pool) (*resolve.Resolver, error) {
+		t.Fatalf("unexpected resolver call: --version must skip resolution")
+		return nil, nil
+	})
+	cmd.SetOut(&stdout)
+	cmd.SetErr(&stderr)
+	cmd.SetArgs([]string{"--version"})
+
+	if err := cmd.Execute(); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	if stderr.Len() != 0 {
+		t.Fatalf("expected empty stderr, got %q", stderr.String())
+	}
+
+	// We check the output shape ("actions-lock version <value>\n") instead of
+	// comparing with cliVersion(). cliVersion() reads build info that can change
+	// across build setups, and calling it here would only repeat the code.
+	const prefix = "actions-lock version "
+	out := stdout.String()
+	if !strings.HasPrefix(out, prefix) || !strings.HasSuffix(out, "\n") {
+		t.Fatalf("unexpected output format: %q", out)
+	}
+	version := strings.TrimSuffix(strings.TrimPrefix(out, prefix), "\n")
+	if version == "" {
+		t.Fatalf("expected non-empty version in stdout: %q", out)
+	}
+}