ENH: Convert itkArray2DTest to GTest

Modules/Core/Common/test/CMakeLists.txt

@@ -35,7 +35,6 @@ set(
   itkSymmetricEllipsoidInteriorExteriorSpatialFunctionTest.cxx
   itkSymmetricSecondRankTensorImageReadTest.cxx
   itkSymmetricSecondRankTensorImageWriteReadTest.cxx
-  itkArray2DTest.cxx
   itkFloatingPointExceptionsTest.cxx
   itkFixedArrayTest2.cxx
   itkNeighborhoodAlgorithmTest.cxx
@@ -429,12 +428,6 @@ itk_add_test(
     ITKCommon1TestDriver
     itkMersenneTwisterRandomVariateGeneratorTest
 )
-itk_add_test(
-  NAME itkArray2DTest
-  COMMAND
-    ITKCommon1TestDriver
-    itkArray2DTest
-)
 itk_add_test(
   NAME itkBSplineInterpolationWeightFunctionTest
   COMMAND

Modules/Core/Common/test/itkArray2DGTest.cxx

@@ -19,6 +19,7 @@
 // First include the header file to be tested:
 #include "itkArray2D.h"
 #include <gtest/gtest.h>
+#include <iostream>
 #include <limits>
 #include <type_traits> // For is_nothrow_move_constructible_v and is_nothrow_move_assignable_v.
 
@@ -110,3 +111,77 @@ TEST(Array2D, MoveAssign)
   checkMoveAssign(itk::Array2D<int>(1U, 1U));
   checkMoveAssign(itk::Array2D<double>(1U, 2U));
 }
+
+
+TEST(Array2D, ConvertedLegacyTest)
+{
+  using ArrayType = itk::Array2D<double>;
+
+  using VnlMatrixType = vnl_matrix<double>;
+
+  constexpr unsigned int rows{ 3 };
+  constexpr unsigned int cols{ 4 };
+
+  ArrayType     a(rows, cols);
+  VnlMatrixType vm(rows, cols);
+
+  for (unsigned int r = 0; r < rows; ++r)
+  {
+    for (unsigned int c = 0; c < cols; ++c)
+    {
+      const auto value = static_cast<double>(r + c);
+      a.SetElement(r, c, value);
+      vm(r, c) = value;
+    }
+  }
+
+  constexpr double tolerance{ 1e-6 };
+
+  // test copy constructor
+  ArrayType b(a);
+
+  for (unsigned int r = 0; r < rows; ++r)
+  {
+    for (unsigned int c = 0; c < cols; ++c)
+    {
+      EXPECT_NEAR(b(r, c), a.GetElement(r, c), tolerance);
+    }
+  }
+
+  // test construction from vnl_matrix
+  ArrayType d(vm);
+
+  for (unsigned int r = 0; r < rows; ++r)
+  {
+    for (unsigned int c = 0; c < cols; ++c)
+    {
+      EXPECT_NEAR(d(r, c), vm(r, c), tolerance);
+    }
+  }
+
+  // test for assignment from Array2D
+
+  ArrayType e = a;
+
+  for (unsigned int r = 0; r < rows; ++r)
+  {
+    for (unsigned int c = 0; c < cols; ++c)
+    {
+      EXPECT_NEAR(e(r, c), a(r, c), tolerance);
+    }
+  }
+
+  // test for assignment from vnl_matrix
+
+  ArrayType f = vm;
+
+  for (unsigned int r = 0; r < rows; ++r)
+  {
+    for (unsigned int c = 0; c < cols; ++c)
+    {
+      EXPECT_NEAR(f(r, c), vm(r, c), tolerance);
+    }
+  }
+
+  std::cout << "Test Passed ! " << std::endl;
+}