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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.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkGTestPredicate_h
#define itkGTestPredicate_h
#include "gtest/gtest.h"
#include "itkNumericTraits.h"
#include <cmath>
/** A custom GTest macro for comparing 2 itk array-like objects. This
* verifies that the root mean squares error between the two array-like
* objects doesn't exceed the given error.
*/
#define ITK_EXPECT_VECTOR_NEAR(val1, val2, rmsError) \
EXPECT_PRED_FORMAT3(itk::GTest::Predicate::VectorDoubleRMSPredFormat, val1, val2, rmsError)
namespace itk
{
namespace GTest
{
/** \namespace itk::GTest::Predicate
* \brief The Predicate namespace contains functions used to
* implement custom GTest Predicate-Formatters.
*/
namespace Predicate
{
/** Implements GTest Predicate Formatter for ITK_EXPECT_VECTOR_NEAR
* macro. This macro and formatter work with any combination of ITK
* array-like objects which are supported by itk::NumericTraits. The
* arrays must be the same length, and the root mean squares error is
* used to check if the arrays are "near" each other.
*/
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
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