ENH: Increase the itk::SingleValuedNonLinearVnlOptimizerv4 coverage

Increase the code coverage for the `itk::SingleValuedNonLinearVnlOptimizerv4` class: exercise the `GetCachedDerivative` and `GetCachedPosition` methods and test their values against the expected values.
InsightSoftwareConsortium · Nov 13, 2023 · 215209f · 215209f
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diff --git a/Modules/Numerics/Optimizersv4/test/itkAmoebaOptimizerv4Test.cxx b/Modules/Numerics/Optimizersv4/test/itkAmoebaOptimizerv4Test.cxx
@@ -367,6 +367,12 @@ AmoebaTest1()
   itkOptimizer->SetFunctionConvergenceTolerance(fTolerance);
   ITK_TEST_SET_GET_VALUE(fTolerance, itkOptimizer->GetFunctionConvergenceTolerance());
 
+  OptimizerType::DerivativeType cachedDerivative{};
+  ITK_TEST_EXPECT_EQUAL(cachedDerivative, itkOptimizer->GetCachedDerivative());
+
+  OptimizerType::ParametersType cachedCurrentPos{};
+  ITK_TEST_EXPECT_EQUAL(cachedCurrentPos, itkOptimizer->GetCachedCurrentPosition());
+
   auto metric = itkAmoebaOptimizerv4TestMetric1::New();
   itkOptimizer->SetMetric(metric);
   std::cout << "itkOptimizer->GetMetric(): " << itkOptimizer->GetMetric() << std::endl;

diff --git a/Modules/Numerics/Optimizersv4/test/itkLBFGSOptimizerv4Test.cxx b/Modules/Numerics/Optimizersv4/test/itkLBFGSOptimizerv4Test.cxx
@@ -191,6 +191,12 @@ itkLBFGSOptimizerv4Test(int, char *[])
   itkOptimizer->SetDefaultStepLength(defaultStepLength);
   ITK_TEST_SET_GET_VALUE(defaultStepLength, itkOptimizer->GetDefaultStepLength());
 
+  OptimizerType::DerivativeType cachedDerivative{};
+  ITK_TEST_EXPECT_EQUAL(cachedDerivative, itkOptimizer->GetCachedDerivative());
+
+  OptimizerType::ParametersType cachedCurrentPos{};
+  ITK_TEST_EXPECT_EQUAL(cachedCurrentPos, itkOptimizer->GetCachedCurrentPosition());
+
   std::cout << "GetValue() before optimizer starts: " << itkOptimizer->GetValue() << std::endl;
   std::cout << "SetMetric." << std::endl;
   itkOptimizer->SetMetric(metric);