Use temp dir. for cache when a unit test is performed

* the temp. dir can also be used for other purposes

src/blackcore/application.cpp

@@ -98,7 +98,12 @@ namespace BlackCore
             QCoreApplication::setApplicationVersion(CVersion::version());
             this->setObjectName(this->m_applicationName);
             const QString executable = QFileInfo(QCoreApplication::applicationFilePath()).fileName();
-            if (executable.startsWith("test")) { this->m_unitTest = true; }
+            if (executable.startsWith("test"))
+            {
+                this->m_unitTest = true;
+                const QString tempPath(this->getTemporaryDirectory());
+                BlackMisc::setMockCacheRootDirectory(tempPath);
+            }
             this->initParser();
             this->initLogging();
 
@@ -385,6 +390,18 @@ namespace BlackCore
         }
     }
 
+    QString CApplication::getTemporaryDirectory() const
+    {
+        if (this->m_tempDirectory.isValid())
+        {
+            return this->m_tempDirectory.path();
+        }
+        else
+        {
+            return QDir::tempPath();
+        }
+    }
+
     QString CApplication::getInfoString(const QString &separator) const
     {
         QString str(CVersion::version());
@@ -424,8 +441,7 @@ namespace BlackCore
             Q_ASSERT(reply);
             multiPart->setParent(reply);
             return reply;
-            }
+        });
-        );
     }
 
     QNetworkReply *CApplication::headerFromNetwork(const CUrl &url, const BlackMisc::CSlot<void (QNetworkReply *)> &callback)

src/blackcore/application.h

@@ -22,6 +22,7 @@
 #include <QScopedPointer>
 #include <QString>
 #include <QStringList>
+#include <QTemporaryDir>
 #include <atomic>
 #include <functional>
 
@@ -188,6 +189,9 @@ namespace BlackCore
         //! Save all settings
         BlackMisc::CStatusMessage saveSettingsByKey(const QStringList &keys);
 
+        //! Directory for temporary files
+        QString getTemporaryDirectory() const;
+
         //! Run event loop
         static int exec();
 
@@ -434,6 +438,7 @@ namespace BlackCore
         QScopedPointer<CSetupReader>             m_setupReader;            //!< setup reader
         QScopedPointer<CWebDataServices>         m_webDataServices;        //!< web data services
         QScopedPointer<BlackMisc::CFileLogger>   m_fileLogger;             //!< file logger
+        QTemporaryDir                            m_tempDirectory;          //!< temp.directory for the lifetime of application object
         QNetworkAccessManager                    m_accessManager { this }; //!< single network access manager
         CCookieManager                           m_cookieManager;          //!< single cookie manager for our access manager
         QString                                  m_applicationName;        //!< application name