[IE TESTS] Add VariadicSplit in SingleLayerTest (#1468)

* [IE TESTS] add variadic split

* [IE TESTS] update  variadic split

* [IE TESTS] update instance variadic split

* [IE TESTS] update variadic_split.cpp

inference-engine/tests/functional/plugin/shared/include/single_layer_tests/variadic_split.hpp

@@ -0,0 +1,34 @@
+// Copyright (C) 2019 Intel Corporation
+// SPDX-License-Identifier: Apache-2.0
+//
+
+#pragma once
+
+#include <tuple>
+#include <string>
+#include <vector>
+#include <memory>
+
+#include "functional_test_utils/layer_test_utils.hpp"
+#include "ngraph_functions/builders.hpp"
+
+namespace LayerTestsDefinitions {
+
+    typedef std::tuple<
+            std::vector<size_t>,            // Num splits
+            size_t,                         // Axis
+            InferenceEngine::Precision,     // Net precision
+            std::vector<size_t>,            // Input shapes
+            std::string                     // Target device name
+    > VariadicSplitParams;
+
+class VariadicSplitLayerTest : public testing::WithParamInterface<VariadicSplitParams>,
+                           public LayerTestsUtils::LayerTestsCommon {
+public:
+    static std::string getTestCaseName(testing::TestParamInfo<VariadicSplitParams> obj);
+
+protected:
+    void SetUp() override;
+};
+
+}  // namespace LayerTestsDefinitions