From af42575b1340bdb791fe15a342c40e87e6d25923 Mon Sep 17 00:00:00 2001
From: Niels Dekker <N.Dekker@lumc.nl>
Date: Wed, 24 Dec 2025 15:08:23 +0100
Subject: [PATCH] ENH: Add front() and back() GoogleTest unit tests to Index,
 Offset, Size

For the sake of completeness. It appeared that some of the `const` overloads of
these member functions did not yet have code coverage.
---
 Modules/Core/Common/test/itkIndexGTest.cxx  | 8 ++++++++
 Modules/Core/Common/test/itkOffsetGTest.cxx | 9 +++++++++
 Modules/Core/Common/test/itkSizeGTest.cxx   | 8 ++++++++
 3 files changed, 25 insertions(+)

diff --git a/Modules/Core/Common/test/itkIndexGTest.cxx b/Modules/Core/Common/test/itkIndexGTest.cxx
index 94cd17ec1d1..a29e5b6c666 100644
--- a/Modules/Core/Common/test/itkIndexGTest.cxx
+++ b/Modules/Core/Common/test/itkIndexGTest.cxx
@@ -102,3 +102,11 @@ TEST(Index, Make)
   const auto values = { 1, 2, 3, 4 };
   EXPECT_TRUE(std::equal(itkIndex.begin(), itkIndex.end(), values.begin(), values.end()));
 }
+
+
+// Tests front() and back().
+TEST(Index, CheckFrontAndBack)
+{
+  itk::RangeGTestUtilities::CheckFrontAndBack(itk::Index<1>{});
+  itk::RangeGTestUtilities::CheckFrontAndBack(itk::Index<>{ 1, 2 });
+}
diff --git a/Modules/Core/Common/test/itkOffsetGTest.cxx b/Modules/Core/Common/test/itkOffsetGTest.cxx
index bd009f97e01..8db6413acf0 100644
--- a/Modules/Core/Common/test/itkOffsetGTest.cxx
+++ b/Modules/Core/Common/test/itkOffsetGTest.cxx
@@ -19,6 +19,7 @@
 // First include the header file to be tested:
 #include "itkOffset.h"
 #include "itkRangeGTestUtilities.h"
+#include <gtest/gtest.h>
 
 
 static_assert(itk::RangeGTestUtilities::CheckConstexprBeginAndEndOfContainer<itk::Offset<>>() &&
@@ -28,3 +29,11 @@ static_assert(itk::RangeGTestUtilities::CheckConstexprBeginAndEndOfContainer<itk
 static_assert(itk::RangeGTestUtilities::IsDistanceFromFrontToBackPlusOneEqualToSize(itk::Offset<>()) &&
                 itk::RangeGTestUtilities::IsDistanceFromFrontToBackPlusOneEqualToSize(itk::Offset<1>()),
               "Check that `distance(&front, &back) + 1` is equal to `size`");
+
+
+// Tests front() and back().
+TEST(Offset, CheckFrontAndBack)
+{
+  itk::RangeGTestUtilities::CheckFrontAndBack(itk::Offset<1>{});
+  itk::RangeGTestUtilities::CheckFrontAndBack(itk::Offset<>{ 1, 2 });
+}
diff --git a/Modules/Core/Common/test/itkSizeGTest.cxx b/Modules/Core/Common/test/itkSizeGTest.cxx
index d6ba8a66b2c..ebc076ac515 100644
--- a/Modules/Core/Common/test/itkSizeGTest.cxx
+++ b/Modules/Core/Common/test/itkSizeGTest.cxx
@@ -174,3 +174,11 @@ TEST(Size, CalculateProductOfElements)
   checkArbitrarySize(itk::MakeSize(2, 4));
   checkArbitrarySize(itk::MakeSize(1, 2, 3));
 }
+
+
+// Tests front() and back().
+TEST(Size, CheckFrontAndBack)
+{
+  itk::RangeGTestUtilities::CheckFrontAndBack(itk::Size<1>{});
+  itk::RangeGTestUtilities::CheckFrontAndBack(itk::Size<>{ 1, 2 });
+}