ENH: Increase itk::RieszFrequencyFilterBankGenerator coverage.

Excercise exception cases.

Exercise the GetOrder method using the TEST_SET_GET_VALUE macro for
regression purposes.

Author: Jon Haitz Legarreta

test/itkRieszFrequencyFilterBankGeneratorTest.cxx

@@ -45,7 +45,6 @@ itkRieszFrequencyFilterBankGeneratorTest( int argc, char* argv[] )
     }
   const std::string inputImage  = argv[1];
   const std::string outputImage = argv[2];
-  unsigned int inputOrder = atoi(argv[3]);
 
   const unsigned int Dimension = 3;
   typedef double                             PixelType;
@@ -72,8 +71,16 @@ itkRieszFrequencyFilterBankGeneratorTest( int argc, char* argv[] )
   EXERCISE_BASIC_OBJECT_METHODS( filterBank, RieszFrequencyFilterBankGenerator, GenerateImageSource );
 
   filterBank->SetSize( fftFilter->GetOutput()->GetLargestPossibleRegion().GetSize() );
+
+  // Test exception cases
+  unsigned int inputOrder = 0;
+  TRY_EXPECT_EXCEPTION( filterBank->SetOrder(inputOrder) );
+
+  inputOrder = atoi(argv[3]);
   filterBank->SetOrder(inputOrder);
-  filterBank->Update();
+  TEST_SET_GET_VALUE( inputOrder, filterBank->GetOrder() );
+
+  TRY_EXPECT_NO_EXCEPTION( filterBank->Update() );
 
   // Get iterator to Indices of RieszFunction.
   typedef RieszFilterBankType::RieszFunctionType::SetType IndicesType;