ENH: Increase RegistrationParameterScalesFromPhysicalShift coverage

Increase coverage for
`itk::RegistrationParameterScalesFromPhysicalShift`:
- Exercise basic object methods using the
  `ITK_EXERCISE_BASIC_OBJECT_METHODS` macro. Remove redundant calls to
  print the filter: rely on the basic method exercising macro call.
- Test the Set/Get methods using the `ITK_TEST_SET_GET_VALUE` macro.

Author: jhlegarreta

Modules/Numerics/Optimizersv4/test/itkAutoScaledGradientDescentRegistrationOnVectorTest.cxx

@@ -126,6 +126,10 @@ itkAutoScaledGradientDescentRegistrationOnVectorTestTemplated(int         number
     std::cout << "Testing RegistrationParameterScalesFromPhysicalShift" << std::endl;
     auto shiftScalesEstimator = ShiftScalesEstimatorType::New();
 
+    ITK_EXERCISE_BASIC_OBJECT_METHODS(
+      shiftScalesEstimator, RegistrationParameterScalesFromPhysicalShift, RegistrationParameterScalesFromShiftBase)
+
+
     shiftScalesEstimator->SetMetric(metric);
     ITK_TEST_SET_GET_VALUE(metric, shiftScalesEstimator->GetMetric());
 
@@ -136,6 +140,14 @@ itkAutoScaledGradientDescentRegistrationOnVectorTestTemplated(int         number
     shiftScalesEstimator->SetCentralRegionRadius(centralRegionRadius);
     ITK_TEST_SET_GET_VALUE(centralRegionRadius, shiftScalesEstimator->GetCentralRegionRadius());
 
+    typename ShiftScalesEstimatorType::VirtualPointSetType::ConstPointer virtualDomainPointSet{};
+    shiftScalesEstimator->SetVirtualDomainPointSet(virtualDomainPointSet);
+    ITK_TEST_SET_GET_VALUE(virtualDomainPointSet, shiftScalesEstimator->GetVirtualDomainPointSet());
+
+    typename ShiftScalesEstimatorType::ParametersValueType smallParameterVariation = 0.01;
+    shiftScalesEstimator->SetSmallParameterVariation(smallParameterVariation);
+    ITK_TEST_SET_GET_VALUE(smallParameterVariation, shiftScalesEstimator->GetSmallParameterVariation());
+
     scalesEstimator = shiftScalesEstimator;
   }
   else