STYLE: Conform to ITK style in miscellaneous tests

Conform to ITK style in miscellaneous tests:
- Use double forward slashes (`//`) for single line comments within the
  body of tests.
- Use medial capitals to name variables: do not use snake case.
- Use the ITK recommended test ending message at the end of tests.

Additionally,
- Remove unnecessary/uniformative comment blocks.
- Chain consecutive insertions (`<<`) to the same output stream.

Modules/Filtering/MathematicalMorphology/test/itkGrayscaleGeodesicErodeDilateImageFilterTest.cxx

@@ -118,5 +118,6 @@ itkGrayscaleGeodesicErodeDilateImageFilterTest(int argc, char * argv[])
     return EXIT_FAILURE;
   }
 
+  std::cout << "Test finished." << std::endl;
   return EXIT_SUCCESS;
 }

Modules/Numerics/Optimizers/test/itkPowellOptimizerTest.cxx

@@ -192,8 +192,7 @@ itkPowellOptimizerTest(int argc, char * argv[])
   }
 
   // Exercise various member functions.
-  std::cout << "CurrentIteration: " << itkOptimizer->GetCurrentIteration();
-  std::cout << std::endl;
+  std::cout << "CurrentIteration: " << itkOptimizer->GetCurrentIteration() << std::endl;
 
   ITK_TEST_EXPECT_EQUAL(itkOptimizer->GetValue(), itkOptimizer->GetCurrentCost());
 

Modules/Numerics/Optimizersv4/test/itkPowellOptimizerv4Test.cxx

@@ -225,9 +225,7 @@ itkPowellOptimizerv4Test(int argc, char * argv[])
   }
 
   ParametersType finalPosition = itkOptimizer->GetCurrentPosition();
-  std::cout << "Solution        = (";
-  std::cout << finalPosition[0] << ",";
-  std::cout << finalPosition[1] << ")" << std::endl;
+  std::cout << "Solution        = (" << finalPosition[0] << "," << finalPosition[1] << ")" << std::endl;
   std::cout << "StopConditionDescription: " << itkOptimizer->GetStopConditionDescription() << std::endl;
 
   //
@@ -242,8 +240,7 @@ itkPowellOptimizerv4Test(int argc, char * argv[])
   }
 
   // Exercise various member functions.
-  std::cout << "CurrentIteration: " << itkOptimizer->GetCurrentIteration();
-  std::cout << std::endl;
+  std::cout << "CurrentIteration: " << itkOptimizer->GetCurrentIteration() << std::endl;
   std::cout << "CurrentCost: " << itkOptimizer->GetCurrentCost() << std::endl;
   std::cout << "CurrentCost (through GetValue): " << itkOptimizer->GetValue() << std::endl;
   std::cout << "CurrentLineIteration: " << itkOptimizer->GetCurrentLineIteration() << std::endl;

Modules/Numerics/Statistics/test/itkKdTreeBasedKmeansEstimatorTest.cxx

@@ -65,19 +65,19 @@ itkKdTreeBasedKmeansEstimatorTest(int argc, char * argv[])
   pointsContainer->Reserve(dataSize);
   pointSet->SetPoints(pointsContainer);
 
-  PointSetType::PointsContainerIterator p_iter = pointsContainer->Begin();
+  PointSetType::PointsContainerIterator pIter = pointsContainer->Begin();
   PointSetType::PointType               point;
   double                                temp;
   std::ifstream                         dataStream(dataFileName);
-  while (p_iter != pointsContainer->End())
+  while (pIter != pointsContainer->End())
   {
     for (i = 0; i < PointSetType::PointDimension; ++i)
     {
       dataStream >> temp;
       point[i] = temp;
     }
-    p_iter.Value() = point;
-    ++p_iter;
+    pIter.Value() = point;
+    ++pIter;
   }
 
   dataStream.close();

Modules/Registration/Common/test/itkImageToSpatialObjectRegistrationTest.cxx

@@ -205,7 +205,6 @@ class SimpleImageToSpatialObjectMetric : public ImageToSpatialObjectMetric<TFixe
 } // end namespace itk
 
 
-/** test */
 int
 itkImageToSpatialObjectRegistrationTest(int, char *[])
 {
@@ -368,7 +367,7 @@ itkImageToSpatialObjectRegistrationTest(int, char *[])
     return EXIT_FAILURE;
   }
 
-  /** Setup the optimizer */
+  // Setup the optimizer
   TransformType::ParametersType m_ParametersScale;
   m_ParametersScale.set_size(3);
 
@@ -465,6 +464,6 @@ itkImageToSpatialObjectRegistrationTest(int, char *[])
     }
   }
 
-  std::cout << "Test Succeed!" << std::endl;
+  std::cout << "Test finished." << std::endl;
   return EXIT_SUCCESS;
 }

Modules/Registration/Metricsv4/test/itkANTSNeighborhoodCorrelationImageToImageMetricv4Test.cxx

@@ -243,11 +243,11 @@ itkANTSNeighborhoodCorrelationImageToImageMetricv4Test(int, char ** const)
   metric->SetRadius(neighborhoodRadius0);
   ITK_TEST_SET_GET_VALUE(neighborhoodRadius0, metric->GetRadius());
 
-  itk::Size<ImageDimension> neighborhood_radius;
-  neighborhood_radius.Fill(1);
+  itk::Size<ImageDimension> neighborhoodRadius;
+  neighborhoodRadius.Fill(1);
 
-  metric->SetRadius(neighborhood_radius);
-  ITK_TEST_SET_GET_VALUE(neighborhood_radius, metric->GetRadius());
+  metric->SetRadius(neighborhoodRadius);
+  ITK_TEST_SET_GET_VALUE(neighborhoodRadius, metric->GetRadius());
 
   metric->SetFixedImage(fixedImage);
   metric->SetMovingImage(movingImage);
@@ -360,7 +360,7 @@ itkANTSNeighborhoodCorrelationImageToImageMetricv4Test(int, char ** const)
 
   /* run the metric with the sparse threader */
   MetricTypePointer metricSparse = MetricType::New();
-  metricSparse->SetRadius(neighborhood_radius);
+  metricSparse->SetRadius(neighborhoodRadius);
   metricSparse->SetFixedImage(fixedImage);
   metricSparse->SetMovingImage(movingImage);
   metricSparse->SetFixedTransform(transformFId);