itkGTestPredicate.h

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#ifndef itkGTestPredicate_h
#define itkGTestPredicate_h


#include "gtest/gtest.h"

#include "itkNumericTraits.h"
#include <cmath>


#define EXPECT_VECTOR_NEAR(val1, val2, rmsError)       \
  EXPECT_PRED_FORMAT3(itk::GTest::Predicate::VectorDoubleRMSPredFormat, \
                      val1, val2, rmsError)


namespace itk
{

namespace GTest
{

namespace Predicate
{

template<typename T1, typename T2>
inline ::testing::AssertionResult VectorDoubleRMSPredFormat(const char* expr1,
                                                            const char* expr2,
                                                            const char* rmsErrorExpr,
                                                            const T1 &val1,
                                                            const T2 &val2,
                                                            double rmsError)
{
  const size_t val1Size = itk::NumericTraits<T1>::GetLength(val1);
  const size_t val2Size = itk::NumericTraits<T2>::GetLength(val2);
  if ( val1Size != val2Size )
    {
    return ::testing::AssertionFailure()
      << "The size of " << expr1 << " and " << expr2
      << " different, where\n"
      << expr1 << " evaluates to " << val1 << ",\n"
      << expr2 << " evaluates to " << val2 << ".";

    }
  double total = 0.0;
  for ( unsigned int i = 0; i < val1Size; ++i )
    {
    const double temp = (val1[i]-val2[i]);
    total += temp*temp;
    }
  const double rms = std::sqrt(total/val1Size);
  if (rms <= rmsError)
    {
    return ::testing::AssertionSuccess();
    }

  return ::testing::AssertionFailure()
    << "The RMS difference between " << expr1 << " and " << expr2
    << " is " << rms << ",\n  which exceeds " << rmsErrorExpr << ", where\n"
    << expr1 << " evaluates to " << val1 << ",\n"
    << expr2 << " evaluates to " << val2 << ", and\n"
    << rmsErrorExpr << " evaluates to " << rmsError << ".";
}

} // end namespace Predicate
} // end namespace GTest
} // end namespace itk

#endif // itkGTestPredicate_h