Move test helper in its own namespace

tests/helper.cpp

@@ -1,5 +1,7 @@
 #include "./helper.h"
 
+namespace TestUtilities {
+
 /*!
  * \brief Prints a TagTextEncoding to enable CPPUNIT_ASSERT_EQUAL for tag values.
  */
@@ -20,3 +22,5 @@ std::ostream &operator <<(std::ostream &os, const Media::TagTextEncoding &encodi
     }
     return os;
 }
+
+}

tests/helper.h

@@ -2,9 +2,12 @@
 #define TAGPARSER_TEST_HELPER
 
 #include "../tagvalue.h"
+#include "../notification.h"
 
 #include <ostream>
 
+namespace TestUtilities {
+
 std::ostream &operator <<(std::ostream &os, const Media::TagTextEncoding &encoding);
 
 /*!
@@ -23,5 +26,6 @@ inline std::ostream &operator <<(std::ostream &os, const Media::PositionInSet &p
     return os << pos.toString();
 }
 
+}
 
 #endif // TAGPARSER_TEST_HELPER

tests/overall.h

@@ -4,8 +4,9 @@
 #include "../mediafileinfo.h"
 #include "../tagvalue.h"
 
-#include <c++utilities/tests/testutils.h>
 #include <c++utilities/conversion/stringconversion.h>
+#include <c++utilities/tests/testutils.h>
+using namespace TestUtilities;
 
 #include <cppunit/extensions/HelperMacros.h>
 #include <cppunit/TestFixture.h>

tests/tagvalue.cpp

@@ -5,6 +5,7 @@
 
 #include <c++utilities/conversion/conversionexception.h>
 #include <c++utilities/chrono/format.h>
+using namespace TestUtilities;
 
 #include <cppunit/TestFixture.h>
 #include <cppunit/extensions/HelperMacros.h>