itkGTestPredicate.h

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 *  Copyright NumFOCUS
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
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#ifndef itkGTestPredicate_h
#define itkGTestPredicate_h
 
 
#include "gtest/gtest.h"
 
#include "itkNumericTraits.h"
#include <cmath>
 
 
#define ITK_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