diff --git a/tests/json/declarationvalidator.cpp b/tests/json/declarationvalidator.cpp
index e9c103d157..a51ac9ab98 100644
--- a/tests/json/declarationvalidator.cpp
+++ b/tests/json/declarationvalidator.cpp
@@ -1,86 +1,87 @@
 /* This file is part of KDevelop
    Copyright 2012 Olivier de Gaalon <olivier.jg@gmail.com>
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License version 2 as published by the Free Software Foundation.
 
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.
 
    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
 */
 #include "language/duchain/declaration.h"
 #include "declarationvalidator.h"
 #include "testsuite.h"
 #include "jsondeclarationtests.h"
 
 #include <QJsonDocument>
 
 namespace KDevelop {
 
 class DeclarationValidatorPrivate
 {
 public:
   DeclarationValidatorPrivate() : testsPassed(true) {}
   bool testsPassed;
 };
 
 QByteArray preprocess(QByteArray json)
 {
   int commentIndex = json.indexOf('#', 0);
   while (commentIndex > -1)
   {
     int commentEnd = json.indexOf('\n', commentIndex);
     if (commentEnd == -1)
     {
       json.truncate(commentIndex);
       break;
     }
     json.remove(commentIndex, commentEnd - commentIndex);
     commentIndex = json.indexOf('#', commentIndex);
   }
 
   return json.prepend('{').append('}');
 }
 
 DeclarationValidator::DeclarationValidator()
 : d(new DeclarationValidatorPrivate)
 {
 }
 DeclarationValidator::~DeclarationValidator()
 {
 }
 
 bool DeclarationValidator::testsPassed()
 {
   return d->testsPassed;
 }
 
 void DeclarationValidator::visit(DUContext*) { }
 void DeclarationValidator::visit(Declaration* declaration)
 {
   QJsonParseError error;
-  QJsonDocument doc = QJsonDocument::fromJson(preprocess(declaration->comment()), &error);
+  const auto json = preprocess(declaration->comment());
+  QJsonDocument doc = QJsonDocument::fromJson(json, &error);
 
   if (error.error == 0)
   {
       QVariantMap testData = doc.toVariant().toMap();
 
       if (!KDevelop::runTests(testData, declaration))
           d->testsPassed = false;
   }
   else
   {
     d->testsPassed = false;
-    qDebug() << "Error parsing test data for declaration on line" << declaration->range().start.line + 1;
-    qDebug() << "Parser error on comment line" << error.errorString();
+    QMessageLogger logger(declaration->topContext()->url().byteArray().constData(), declaration->range().start.line, nullptr);
+    logger.warning() << "Error parsing JSON test data:" << error.errorString() << "at offset" << error.offset << "JSON input was:\n" << json;
   }
 }
 
 }