diff --git a/src/core/DownloadManager.h b/src/core/DownloadManager.h
--- a/src/core/DownloadManager.h
+++ b/src/core/DownloadManager.h
@@ -268,7 +268,7 @@
      */
     Q_INVOKABLE bool areVoicesRegistered() const;
 
-    /*
+    /**
      * Registers a rcc resource file given by a relative resource path
      *
      * @param filename  Relative resource path.
diff --git a/tests/core/CMakeLists.txt b/tests/core/CMakeLists.txt
--- a/tests/core/CMakeLists.txt
+++ b/tests/core/CMakeLists.txt
@@ -13,6 +13,7 @@
               DirectoryTest.cpp
               FileTest.cpp
               ApplicationInfoTest.cpp
+              DownloadManagerTest.cpp
               # add new test file here
               NAME_PREFIX Core
               LINK_LIBRARIES ${CORE_TEST_LIBRARIES})
diff --git a/tests/core/DownloadManagerTest.cpp b/tests/core/DownloadManagerTest.cpp
new file mode 100644
--- /dev/null
+++ b/tests/core/DownloadManagerTest.cpp
@@ -0,0 +1,195 @@
+/* GCompris - DownloadManagerTest.cpp
+ *
+ * Copyright (C) 2018 Alex Kovrigin <a.kovrigin0@gmail.com>
+ * GCompris  (C) 2018 GCompris Developers  <gcompris-devel@kde.org>
+ *
+ * Authors:
+ *   Alex Kovrigin <a.kovrigin0@gmail.com>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program 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 General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <QObject>
+#include <QtTest>
+#include <QDebug>
+#include <QString>
+
+#include "src/core/DownloadManager.h"
+#include "src/core/ApplicationInfo.h"
+#include "ApplicationSettingsMock.h"
+/**
+ * @brief The DownloadManagerTest class Unit tests class for DownloadManager testing
+ * @sa DownloadManager
+ */
+class DownloadManagerTest : public QObject
+{
+    Q_OBJECT
+public:
+    explicit DownloadManagerTest(QObject *parent = nullptr) : QObject(parent)
+    { }
+private slots:
+    /**
+     * @brief initTestCase Case for basic functonality of DownloadManager
+     */
+    void initTestCase()
+    {
+        ApplicationSettingsMock::getInstance()->setIsAutomaticDownloadsEnabled(false);
+        subject = DownloadManager::getInstance();
+    }
+
+    void test_getVoicesResourceForLocale_data()
+    {
+        QTest::addColumn<QString>("locale");
+        QTest::addColumn<QString>("language");
+
+        QTest::newRow("en_US") << "en_US" << "en";
+        QTest::newRow("en_UK") << "en_UK" << "en";
+        QTest::newRow("ru_RU") << "ru_RU" << "ru";
+        QTest::newRow("de_DE") << "de_DE" << "de";
+        QTest::newRow("fr_FR") << "fr_FR" << "fr";
+    }
+    void test_getVoicesResourceForLocale()
+    {
+        QFETCH(QString, locale);
+        QFETCH(QString, language);
+
+        QCOMPARE( subject->getVoicesResourceForLocale(locale),
+                  QString("data2/voices-%1/voices-%2.rcc").arg(COMPRESSED_AUDIO, language) );
+    }
+
+    void test_haveLocalResource_data()
+    {
+        QTest::addColumn<QString>("resource");
+        QTest::addColumn<bool>("expected_success");
+
+        QTest::newRow("invalid.invalid") << "invalid.invalid" << false;
+        QTest::newRow("no.no") << "no.no" << false;
+        QTest::newRow("money.rcc") << "money.rcc" << true;
+        QTest::newRow("penalty.rcc") << "penalty.rcc" << true;
+    }
+    void test_haveLocalResource()
+    {
+        QFETCH(QString, resource);
+        QFETCH(bool, expected_success);
+
+        QVERIFY(expected_success == subject->haveLocalResource(resource));
+    }
+
+    void test_downloadResource_data()
+    {
+        QTest::addColumn<QString>("resource");
+
+        QTest::newRow("invalid.blabla") << "invalid.blabla";
+        QTest::newRow("algorithm.rcc") << "algorithm.rcc";
+    }
+    void test_downloadResource()
+    {
+        QFETCH(QString, resource);
+
+        QVERIFY(subject->downloadResource(resource));
+        QVERIFY(!subject->downloadResource(resource));
+    }
+
+    void test_updateResource_data()
+    {
+        QTest::addColumn<QString>("resource");
+        QTest::addColumn<bool>("expected_success");
+
+        QTest::newRow("invalid.haha") << "invalid.haha" << false;
+        QTest::newRow("money.rcc") << "money.rcc" << true;
+    }
+    void test_updateResource()
+    {
+        QFETCH(QString, resource);
+        QFETCH(bool, expected_success);
+
+        QVERIFY(expected_success == subject->updateResource(resource));
+    }
+
+    void test_downloadIsRunning_data()
+    {
+        QTest::addColumn<QString>("resource");
+
+        QTest::newRow("colors.rcc") << "colors.rcc";
+    }
+    void test_downloadIsRunning()
+    {
+        QFETCH(QString, resource);
+
+        subject->abortDownloads();
+        QVERIFY(!subject->downloadIsRunning());
+        QVERIFY(subject->downloadResource(resource));
+        QVERIFY(subject->downloadIsRunning());
+        subject->abortDownloads();
+    }
+
+    void test_registerResource_data()
+    {
+        QTest::addColumn<QString>("resource");
+        QTest::addColumn<bool>("expected_success");
+
+        QTest::newRow("invalid.rcc") << "invalid.rcc" << false;
+        QTest::newRow("money.rcc") << "money.rcc" << true;
+    }
+    void test_registerResource()
+    {
+        QFETCH(QString, resource);
+        QFETCH(bool, expected_success);
+
+        QVERIFY(expected_success == subject->registerResource(resource));
+    }
+
+    void test_isDataRegistered_data()
+    {
+        QTest::addColumn<QString>("resource");
+        QTest::addColumn<QString>("register_mode");
+
+        QTest::newRow("invalid.rcc") << "invalid.rcc" << "invalid";
+        QTest::newRow("money.rcc") << "money.rcc" << "register";
+        QTest::newRow("mosaic.rcc") << "mosaic.rcc" << "no_register";
+        QTest::newRow("money.rcc") << "money.rcc" << "register";
+    }
+    void test_isDataRegistered()
+    {
+        QFETCH(QString, resource);
+        QFETCH(QString, register_mode);
+
+        if(register_mode == "register") {
+            QVERIFY(QResource::registerResource(
+                        QString("./%1/rcc/%2").arg(GCOMPRIS_DATA_FOLDER, resource),
+                        QString(":/gcompris/data/%1").arg(resource)));
+
+            QVERIFY(subject->isDataRegistered(resource));
+        }
+        else if(register_mode == "no_register") {
+            QVERIFY(!subject->isDataRegistered(resource));
+        }
+        else if(register_mode == "invalid") {
+            QVERIFY(!subject->registerResource(resource));
+            QVERIFY(!subject->isDataRegistered(resource));
+        }
+        else {
+            qDebug() << "Incorrect register_mode!";
+            QVERIFY(false);
+        }
+    }
+private:
+    /**
+     * @brief subject The DownloadManager object, that is the test subject
+     */
+    DownloadManager * subject;
+};
+
+QTEST_MAIN(DownloadManagerTest);
+#include "DownloadManagerTest.moc"