Tests: mv .h file

Tests/Unit/Sim/FitObjectiveTest.cpp

 #include "Sim/Fitting/FitObjective.h"
 #include "Tests/GTestWrapper/google_test.h"
-#include "Tests/Unit/FittingTestHelper.h"
+#include "Tests/Unit/Sim/FittingTestHelper.h"
 
 class FitObjectiveTest : public ::testing::Test {};
 

Tests/Unit/FittingTestHelper.h → Tests/Unit/Sim/FittingTestHelper.h

-#ifndef BORNAGAIN_TESTS_UNIT_FITTINGTESTHELPER_H
-#define BORNAGAIN_TESTS_UNIT_FITTINGTESTHELPER_H
+#ifndef BORNAGAIN_TESTS_UNIT_SIM_FITTINGTESTHELPER_H
+#define BORNAGAIN_TESTS_UNIT_SIM_FITTINGTESTHELPER_H
 
 #include "Base/Axis/FixedBinAxis.h"
 #include "Base/Const/Units.h"
@@ -60,4 +60,4 @@ public:
     size_t size() const { return m_nx * m_ny; }
 };
 
-#endif // BORNAGAIN_TESTS_UNIT_FITTINGTESTHELPER_H
+#endif // BORNAGAIN_TESTS_UNIT_SIM_FITTINGTESTHELPER_H

Tests/Unit/Sim/SimDataPairTest.cpp

 #include "Sim/Fitting/SimDataPair.h"
 #include "Tests/GTestWrapper/google_test.h"
-#include "Tests/Unit/FittingTestHelper.h"
+#include "Tests/Unit/Sim/FittingTestHelper.h"
 #include <numeric>
 
 class SimDataPairTest : public ::testing::Test {};