diff --git a/tests/TypePrinter.h b/tests/TypePrinter.h
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+++ b/tests/TypePrinter.h
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+/*
+ * Copyright (c) 2017-2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ARM_COMPUTE_TEST_TYPE_PRINTER_H__
+#define __ARM_COMPUTE_TEST_TYPE_PRINTER_H__
+
+#include "tests/Types.h"
+
+namespace arm_compute
+{
+/** Formatted output of the GradientDimension type.
+ *
+ * @param[out] os  Output stream
+ * @param[in]  dim Type to output
+ *
+ * @return Modified output stream.
+ */
+inline ::std::ostream &operator<<(::std::ostream &os, const GradientDimension &dim)
+{
+    switch(dim)
+    {
+        case GradientDimension::GRAD_X:
+            os << "GRAD_X";
+            break;
+        case GradientDimension::GRAD_Y:
+            os << "GRAD_Y";
+            break;
+        case GradientDimension::GRAD_XY:
+            os << "GRAD_XY";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+/** Formatted output of the GradientDimension type.
+ *
+ * @param[in] type Type to output
+ *
+ * @return Formatted string.
+ */
+inline std::string to_string(const arm_compute::GradientDimension &type)
+{
+    std::stringstream str;
+    str << type;
+    return str.str();
+}
+
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_TEST_TYPE_PRINTER_H__ */