IVGCVSW-3740 Add Reference Workload support for ABS

 * Implemented RefAbsWorkload and unit tests

Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: Ibfcdb2b37fd8d240c181f96856e2c997a4b88914
diff --git a/src/backends/backendsCommon/test/CMakeLists.txt b/src/backends/backendsCommon/test/CMakeLists.txt
index c0760cb..6b71522 100644
--- a/src/backends/backendsCommon/test/CMakeLists.txt
+++ b/src/backends/backendsCommon/test/CMakeLists.txt
@@ -38,6 +38,8 @@
     TensorCopyUtils.hpp
     WorkloadFactoryHelper.hpp
     WorkloadTestUtils.hpp
+    layerTests/AbsTestImpl.cpp
+    layerTests/AbsTestImpl.hpp
     layerTests/ActivationTestImpl.cpp
     layerTests/ActivationTestImpl.hpp
     layerTests/AdditionTestImpl.cpp