feat: allow custom QR login output

client_test.go

@@ -12,12 +12,41 @@ import (
 	"net/http/cookiejar"
 	"net/http/httptest"
 	"net/url"
+	"os"
 	"strings"
 	"sync"
 	"testing"
 	"time"
 )
 
+func TestWithQRWriter(t *testing.T) {
+	var output bytes.Buffer
+	client, err := NewClient(t.TempDir(), WithQRWriter(&output))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if client.qrWriter != &output {
+		t.Fatalf("qrWriter = %v, want custom writer", client.qrWriter)
+	}
+}
+
+func TestWithQRWriterRejectsNil(t *testing.T) {
+	_, err := NewClient(t.TempDir(), WithQRWriter(nil))
+	if err == nil || err.Error() != "QR writer must not be nil" {
+		t.Fatalf("error = %v, want QR writer must not be nil", err)
+	}
+}
+
+func TestDefaultQRWriterIsStdout(t *testing.T) {
+	client, err := NewClient(t.TempDir())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if client.qrWriter != os.Stdout {
+		t.Fatalf("qrWriter = %v, want os.Stdout", client.qrWriter)
+	}
+}
+
 func TestRequestEncryptedPostAndPlainResponse(t *testing.T) {
 	var received url.Values
 	handlerErrors := make(chan error, 1)