COMPMID-1451 Properly remove dimensions in CLReduceMean

Change-Id: I7bd4a8ce81483ba56686b765ca3caabebe42882d
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/155000
Tested-by: bsgcomp <bsgcomp@arm.com>
Reviewed-by: Michele DiGiorgio <michele.digiorgio@arm.com>
diff --git a/tests/validation/CL/ReduceMean.cpp b/tests/validation/CL/ReduceMean.cpp
index 07e859f..cfd4a27 100644
--- a/tests/validation/CL/ReduceMean.cpp
+++ b/tests/validation/CL/ReduceMean.cpp
@@ -48,7 +48,7 @@
 
 const auto axis_keep = combine(framework::dataset::make("Axis", { Coordinates(0), Coordinates(1, 0), Coordinates(1, 2), Coordinates(0, 2), Coordinates(1, 3), Coordinates(0, 1, 2, 3) }),
                                framework::dataset::make("KeepDims", { true }));
-const auto axis_drop = combine(framework::dataset::make("Axis", { Coordinates(0), Coordinates(1), Coordinates(3) }), framework::dataset::make("KeepDims", { false }));
+const auto axis_drop = combine(framework::dataset::make("Axis", { Coordinates(0), Coordinates(1), Coordinates(3), Coordinates(1, 2), Coordinates(2, 1) }), framework::dataset::make("KeepDims", { false }));
 } // namespace
 TEST_SUITE(CL)
 TEST_SUITE(ReduceMean)