Added simple tests

src/frontends/onnx/tests/models/int4_const.prototxt

@@ -0,0 +1,41 @@
+ir_version: 10
+producer_name: "OpenVINO ONNX Frontend"
+graph {
+  name: "test"
+  node {
+    output: "Y"
+    op_type: "Constant"
+    attribute {
+      name: "value"
+      t {
+        dims: 4
+        data_type: 22
+        int32_data: 15
+        int32_data: 113
+        name: "int4_const"
+      }
+      type: TENSOR
+    }
+  }
+  node {
+    input: "Y"
+    output: "O"
+    op_type: "Shape"
+  }
+  output {
+    name: "O"
+    type {
+      tensor_type {
+        elem_type: 7
+        shape {
+          dim {
+            dim_value: 1
+          }
+        }
+      }
+    }
+  }
+}
+opset_import {
+  version: 21
+}

src/frontends/onnx/tests/models/uint4_const.prototxt

@@ -0,0 +1,41 @@
+ir_version: 10
+producer_name: "OpenVINO ONNX Frontend"
+graph {
+  name: "test"
+  node {
+    output: "Y"
+    op_type: "Constant"
+    attribute {
+      name: "value"
+      t {
+        dims: 4
+        data_type: 21
+        int32_data: 16
+        int32_data: 248
+        name: "uint4_const"
+      }
+      type: TENSOR
+    }
+  }
+  node {
+    input: "Y"
+    output: "O"
+    op_type: "Shape"
+  }
+  output {
+    name: "O"
+    type {
+      tensor_type {
+        elem_type: 7
+        shape {
+          dim {
+            dim_value: 1
+          }
+        }
+      }
+    }
+  }
+}
+opset_import {
+  version: 21
+}

src/frontends/onnx/tests/onnx_import.in.cpp

@@ -159,6 +159,22 @@ OPENVINO_TEST(${BACKEND_NAME}, onnx_bool_init_raw) {
     test_case.run();
 }
 
+OPENVINO_TEST(${BACKEND_NAME}, onnx_int4_const) {
+    auto model = convert_model("int4_const.onnx");
+
+    auto test_case = ov::test::TestCase(model, s_device);
+    test_case.add_expected_output(std::vector<int64_t>{4});
+    test_case.run();
+}
+
+OPENVINO_TEST(${BACKEND_NAME}, onnx_uint4_const) {
+    auto model = convert_model("uint4_const.onnx");
+
+    auto test_case = ov::test::TestCase(model, s_device);
+    test_case.add_expected_output(std::vector<int64_t>{4});
+    test_case.run();
+}
+
 OPENVINO_TEST(${BACKEND_NAME}, onnx_model_add_abc_initializers) {
     auto model = convert_model("add_abc_initializers.onnx");