Added ConstantLayer support to TfLiteParser

Change-Id: Iecc4fe8208b442d9c872e56c3d47249f959c6cc1
diff --git a/src/armnnTfLiteParser/test/Constant.cpp b/src/armnnTfLiteParser/test/Constant.cpp
new file mode 100644
index 0000000..356e1b7
--- /dev/null
+++ b/src/armnnTfLiteParser/test/Constant.cpp
@@ -0,0 +1,113 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include <boost/test/unit_test.hpp>
+#include "ParserFlatbuffersFixture.hpp"
+#include "../TfLiteParser.hpp"
+
+#include <string>
+#include <iostream>
+
+using armnnTfLiteParser::TfLiteParser;
+
+BOOST_AUTO_TEST_SUITE(TensorflowLiteParser)
+
+struct ConstantAddFixture : public ParserFlatbuffersFixture
+{
+    explicit ConstantAddFixture(const std::string & inputShape,
+                                const std::string & outputShape,
+                                const std::string & constShape,
+                                const std::string & constData)
+    {
+        m_JsonString = R"(
+            {
+                "version": 3,
+                "operator_codes": [ { "builtin_code": "ADD" } ],
+                "subgraphs": [ {
+                    "tensors": [
+                        {
+                            "shape": )" + constShape + R"( ,
+                            "type": "UINT8",
+                            "buffer": 3,
+                            "name": "ConstTensor",
+                            "quantization": {
+                                "min": [ 0.0 ],
+                                "max": [ 255.0 ],
+                                "scale": [ 1.0 ],
+                                "zero_point": [ 0 ],
+                            }
+                        },
+                        {
+                            "shape": )" + inputShape + R"(,
+                            "type": "UINT8",
+                            "buffer": 1,
+                            "name": "InputTensor",
+                            "quantization": {
+                                "min": [ 0.0 ],
+                                "max": [ 255.0 ],
+                                "scale": [ 1.0 ],
+                                "zero_point": [ 0 ],
+                            }
+                        },
+                        {
+                            "shape": )" + outputShape + R"( ,
+                            "type": "UINT8",
+                            "buffer": 2,
+                            "name": "OutputTensor",
+                            "quantization": {
+                                "min": [ 0.0 ],
+                                "max": [ 255.0 ],
+                                "scale": [ 1.0 ],
+                                "zero_point": [ 0 ],
+                            }
+                        }
+                    ],
+                "inputs": [ 1 ],
+                "outputs": [ 2 ],
+                "operators": [
+                    {
+                        "opcode_index": 0,
+                        "inputs": [ 1, 0 ],
+                        "outputs": [ 2 ],
+                        "builtin_options_type": "AddOptions",
+                        "builtin_options": {
+                        },
+                        "custom_options_format": "FLEXBUFFERS"
+                    }
+                ],
+              } ],
+              "buffers" : [
+                  { },
+                  { },
+                  { },
+                  { "data": )" + constData + R"(, },
+              ]
+            }
+      )";
+      Setup();
+    }
+};
+
+
+struct SimpleConstantAddFixture : ConstantAddFixture
+{
+    SimpleConstantAddFixture()
+        : ConstantAddFixture("[ 2, 2 ]",        // inputShape
+                             "[ 2, 2 ]",        // outputShape
+                             "[ 2, 2 ]",        // constShape
+                             "[  4,5, 6,7 ]")   // constData
+    {}
+};
+
+BOOST_FIXTURE_TEST_CASE(SimpleConstantAdd, SimpleConstantAddFixture)
+{
+    RunTest<2, armnn::DataType::QuantisedAsymm8>(
+                0,
+                {{"InputTensor", { 0, 1, 2, 3 }}},
+                {{"OutputTensor", { 4, 6, 8, 10 }}}
+                );
+}
+
+BOOST_AUTO_TEST_SUITE_END()