Add tensor related data structures for the new API

Adds the following:
 - TensorDescriptor: which is responsible for holding the information
 needed to represent a tensor (e.g. shape, dimensions, etc)
 - Tensor: an aggreate object of a descriptor and a backing memory
 - TensorPack: A map of tensor that can be passed to operators as
 inputs/outputs

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Change-Id: I02734ac6ad85700d91d6e73217b4637adbf5d177
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5260
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/tests/validation/fixtures/UNIT/Context.h b/tests/validation/fixtures/UNIT/Context.h
new file mode 100644
index 0000000..afa49e00
--- /dev/null
+++ b/tests/validation/fixtures/UNIT/Context.h
@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2021 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_UNIT_CONTEXT
+#define ARM_COMPUTE_TEST_UNIT_CONTEXT
+
+#include "arm_compute/Acl.hpp"
+#include "tests/framework/Asserts.h"
+#include "tests/framework/Fixture.h"
+#include "tests/framework/Macros.h"
+#include "tests/validation/Validation.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+/** Test-case for AclDestroyContext
+ *
+ * Validate that AclDestroyContext behaves as expected when invalid inputs as context are given
+ *
+ * Test Steps:
+ *  - Call AclDestroyContext with null context
+ *  - Confirm that AclInvalidArgument is reported
+ *  - Call AclDestroyContext on empty array
+ *  - Confirm that AclInvalidArgument is reported
+ *  - Call AclDestroyContext on an ACL object other than AclContext
+ *  - Confirm that AclInvalidArgument is reported
+ *  - Confirm that context is still nullptr
+ */
+template <AclTarget Target>
+class DestroyInvalidContextFixture : public framework::Fixture
+{
+public:
+    void setup()
+    {
+        AclContext ctx = nullptr;
+        std::array<char, 256> empty_array{};
+        AclContext valid_ctx = nullptr;
+        ARM_COMPUTE_ASSERT(AclCreateContext(&valid_ctx, Target, nullptr) == AclStatus::AclSuccess);
+        ARM_COMPUTE_ASSERT(AclDestroyContext(ctx) == AclStatus::AclInvalidArgument);
+        ARM_COMPUTE_ASSERT(AclDestroyContext(reinterpret_cast<AclContext>(empty_array.data())) == AclStatus::AclInvalidArgument);
+        ARM_COMPUTE_ASSERT(ctx == nullptr);
+        ARM_COMPUTE_ASSERT(AclDestroyContext(valid_ctx) == AclStatus::AclSuccess);
+    };
+};
+
+/** Test-case for AclCreateContext and AclDestroyContext
+ *
+ * Validate that AclCreateContext can create and destroy a context through the C API
+ *
+ * Test Steps:
+ *  - Call AclCreateContext with valid target
+ *  - Confirm that context is not nullptr and error code is AclSuccess
+ *  - Destroy context
+ *  - Confirm that AclSuccess is reported
+ */
+template <AclTarget Target>
+class SimpleContextCApiFixture : public framework::Fixture
+{
+public:
+    void setup()
+    {
+        AclContext ctx = nullptr;
+        ARM_COMPUTE_ASSERT(AclCreateContext(&ctx, Target, nullptr) == AclStatus::AclSuccess);
+        ARM_COMPUTE_ASSERT(ctx != nullptr);
+        ARM_COMPUTE_ASSERT(AclDestroyContext(ctx) == AclStatus::AclSuccess);
+    };
+};
+
+/** Test-case for Context from the C++ interface
+ *
+ * Test Steps:
+ *  - Create a Context obejct
+ *  - Confirm that StatusCode::Success is reported
+ *  - Confirm that equality operator works
+ *  - Confirm that inequality operator works
+ */
+template <acl::Target Target>
+class SimpleContextCppApiFixture : public framework::Fixture
+{
+public:
+    void setup()
+    {
+        acl::StatusCode status = acl::StatusCode::Success;
+        acl::Context    ctx(Target, &status);
+        ARM_COMPUTE_ASSERT(status == acl::StatusCode::Success);
+
+        auto ctx_eq = ctx;
+        ARM_COMPUTE_ASSERT(ctx_eq == ctx);
+
+        acl::Context ctx_ienq(Target, &status);
+        ARM_COMPUTE_ASSERT(status == acl::StatusCode::Success);
+        ARM_COMPUTE_ASSERT(ctx_ienq != ctx);
+    };
+};
+
+/** Test-case for multiple contexes
+ *
+ * Validate that AclCreateContext can create/destroy multiple contexts with different options
+ *
+ * Test Steps:
+ *  - Call AclCreateContext with different targets
+ *  - Confirm that AclSuccess is reported
+ *  - Destroy all contexts
+ *  - Confirm that AclSuccess is reported
+ */
+template <AclTarget Target>
+class MultipleContextsFixture : public framework::Fixture
+{
+public:
+    void setup()
+    {
+        const unsigned int num_tests = 5;
+        std::array<AclContext, num_tests> ctxs{};
+        for(unsigned int i = 0; i < num_tests; ++i)
+        {
+            ARM_COMPUTE_ASSERT(AclCreateContext(&ctxs[i], Target, nullptr) == AclStatus::AclSuccess);
+            ARM_COMPUTE_ASSERT(ctxs[i] != nullptr);
+            ARM_COMPUTE_ASSERT(AclDestroyContext(ctxs[i]) == AclStatus::AclSuccess);
+        }
+    };
+};
+} // namespace validation
+} // namespace test
+} // namespace arm_compute
+#endif /* ARM_COMPUTE_TEST_UNIT_CONTEXT */