Reset master to testing content

internal/wine/version_test.go

@@ -0,0 +1,65 @@
+package wine
+
+import (
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestInstalledVersion(t *testing.T) {
+	root := t.TempDir()
+	helper := filepath.Join(root, "wine-access.exe")
+	// The launcher must never run, including for old helpers lacking metadata.
+	marker := filepath.Join(root, "executed")
+	if err := os.WriteFile(helper, []byte("#!/bin/sh\ntouch '"+marker+"'\nexit 99\n"), 0700); err != nil {
+		t.Fatal(err)
+	}
+	t.Setenv("CTHULHU_WINE_ACCESS_HELPER", helper)
+	for _, test := range []struct {
+		name, declaration, want string
+	}{
+		{"current", `const char release[] = "2026.10.24";`, "2026.10.24"},
+		{"old helper", `int unused;`, ""},
+		{"invalid date", `const char release[] = "2026.99.99";`, ""},
+		{"oversized", `const char release[] = "2026.10.24 extra";`, ""},
+		{"unterminated", `const char release[11] = "2026.10.24x";`, ""},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			source := "__attribute__((used, section(\".wine_access.version\")))\n" + test.declaration
+			if test.name == "old helper" {
+				source = test.declaration
+			}
+			command := exec.Command("cc", "-shared", "-fPIC", "-x", "c", "-o", helper+".so", "-")
+			command.Stdin = strings.NewReader(source)
+			if output, err := command.CombinedOutput(); err != nil {
+				t.Fatalf("compile helper metadata fixture: %v\n%s", err, output)
+			}
+			if got := InstalledVersion(); got != test.want {
+				t.Fatalf("InstalledVersion() = %q, want %q", got, test.want)
+			}
+			link := filepath.Join(t.TempDir(), "wine-access.exe")
+			if err := os.Symlink(helper, link); err != nil {
+				t.Fatal(err)
+			}
+			t.Setenv("CTHULHU_WINE_ACCESS_HELPER", link)
+			if got := InstalledVersion(); got != test.want {
+				t.Fatalf("symlink InstalledVersion() = %q, want %q", got, test.want)
+			}
+		})
+	}
+	if _, err := os.Stat(marker); !os.IsNotExist(err) {
+		t.Fatalf("version detection executed the helper: %v", err)
+	}
+	if err := os.WriteFile(helper+".so", []byte("broken sidecar"), 0600); err != nil {
+		t.Fatal(err)
+	}
+	if got := InstalledVersion(); got != "" {
+		t.Fatalf("invalid ELF returned %q", got)
+	}
+	t.Setenv("CTHULHU_WINE_ACCESS_HELPER", "/usr/bin/true")
+	if got := InstalledVersion(); got != "" {
+		t.Fatalf("missing sidecar returned %q", got)
+	}
+}