test(ci): fix windows tracking and capture flakes

internal/cmd/docs_write_update_test.go

@@ -3,6 +3,8 @@ package cmd
 import (
 	"context"
 	"encoding/json"
+	"errors"
+	"io/fs"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -320,8 +322,8 @@ func TestDocsWriteUpdate_FileInputErrors(t *testing.T) {
 	if err == nil {
 		t.Fatal("expected error for non-existent file, got nil")
 	}
-	if !strings.Contains(err.Error(), "no such file") {
-		t.Fatalf("expected 'no such file' error, got: %v", err)
+	if !errors.Is(err, fs.ErrNotExist) {
+		t.Fatalf("expected fs.ErrNotExist, got: %v", err)
 	}
 
 	// Test with empty file

internal/cmd/testutil_test.go

@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"errors"
@@ -80,13 +81,20 @@ func captureStdout(t *testing.T, fn func()) string {
 	}
 	os.Stdout = w
 
+	var buf bytes.Buffer
+	done := make(chan struct{})
+	go func() {
+		_, _ = io.Copy(&buf, r)
+		close(done)
+	}()
+
 	fn()
 
 	_ = w.Close()
 	os.Stdout = orig
-	b, _ := io.ReadAll(r)
+	<-done
 	_ = r.Close()
-	return string(b)
+	return buf.String()
 }
 
 func captureStderr(t *testing.T, fn func()) string {
@@ -99,13 +107,20 @@ func captureStderr(t *testing.T, fn func()) string {
 	}
 	os.Stderr = w
 
+	var buf bytes.Buffer
+	done := make(chan struct{})
+	go func() {
+		_, _ = io.Copy(&buf, r)
+		close(done)
+	}()
+
 	fn()
 
 	_ = w.Close()
 	os.Stderr = orig
-	b, _ := io.ReadAll(r)
+	<-done
 	_ = r.Close()
-	return string(b)
+	return buf.String()
 }
 
 func withStdin(t *testing.T, input string, fn func()) {

internal/tracking/config.go

@@ -45,6 +45,10 @@ func ConfigPath() (string, error) {
 }
 
 func legacyConfigPath() (string, error) {
+	if xdg := strings.TrimSpace(os.Getenv("XDG_CONFIG_HOME")); xdg != "" {
+		return filepath.Join(xdg, "gog", "tracking.json"), nil
+	}
+
 	configDir, err := os.UserConfigDir()
 	if err != nil {
 		return "", fmt.Errorf("user config dir: %w", err)

internal/tracking/config_more_test.go

@@ -109,6 +109,19 @@ func TestLoadConfigLegacyFallback(t *testing.T) {
 	}
 }
 
+func TestLegacyConfigPathUsesXDGConfigHome(t *testing.T) {
+	setupTrackingConfigEnv(t)
+
+	path, err := legacyConfigPath()
+	if err != nil {
+		t.Fatalf("legacyConfigPath: %v", err)
+	}
+
+	if !strings.Contains(path, filepath.Join("xdg", "gog", "tracking.json")) {
+		t.Fatalf("expected XDG-based legacy path, got %q", path)
+	}
+}
+
 func TestSaveConfigMissingAccount(t *testing.T) {
 	setupTrackingConfigEnv(t)