IVGCVSW-3267 Add more code coverage to the PReLU layer

 * Added more unit tests to cover all code branches
 * Moved the InferOutput tests to separate files
 * Created convenience ARMNN_SIMPLE_TEST_CASE macro
 * Created TestUtils file for common utility functions

Change-Id: Id971d3cf77005397d1f0b2783fab68b1f0bf9dfc
Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>
diff --git a/src/backends/backendsCommon/test/CommonTestUtils.hpp b/src/backends/backendsCommon/test/CommonTestUtils.hpp
index 5da0228..03c9755 100644
--- a/src/backends/backendsCommon/test/CommonTestUtils.hpp
+++ b/src/backends/backendsCommon/test/CommonTestUtils.hpp
@@ -12,11 +12,9 @@
 #include <backendsCommon/CpuTensorHandle.hpp>
 #include <backendsCommon/BackendRegistry.hpp>
 
-#include <algorithm>
+#include <test/TestUtils.hpp>
 
-// Connects two layers
-void Connect(armnn::IConnectableLayer* from, armnn::IConnectableLayer* to, const armnn::TensorInfo& tensorInfo,
-             unsigned int fromIndex = 0, unsigned int toIndex = 0);
+#include <algorithm>
 
 // Checks that two collections have the exact same contents (in any order)
 // The given collections do not have to contain duplicates