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+# How to extend the OpenVINO™ JavaScript API code
+
+## Build the OpenVINO™ JavaScript API 
+For detailed build instructions, refer to the [OpenVINO™ JavaScript API documentation](./README.md).
+
+## Project's naming conventions
+When implementing the C++ sources for the JavaScript API, it is essential to adhere to the OpenVINO naming conventions described in the [OpenVINO Coding Style Guide](../../../../docs/dev/coding_style.md). In summary, the naming style employs `Snake Case` for methods, functions, and variables, while `Camel Case` is used for class names. Additionally, the naming of entities in the C++ sources should closely mirror their equivalents in the C++ API to maintain consistency.
+
+For methods that are exposed to JavaScript, the naming convention transitions to `Camel Case`, aligning with common JavaScript practices. As an example, a method in the C++ API named `get_element_type` would be represented in the JavaScript API as `getElementType()`.
+
+## node-addon-api module
+
+[node addon api](https://github.com/nodejs/node-addon-api) is used to create OpenVINO JavaScript API for Node.js. The quickest way to learn is to follow the official [examples](https://github.com/nodejs/node-addon-examples). It is recommended to check out the tutorial on [how to create a JavaScript object from a C++ object](https://github.com/nodejs/node-addon-examples/tree/main/src/2-js-to-native-conversion/object-wrap-demo/node-addon-api).
+
+
+
+
+
+## Adding a new class and method
+To introduce a new `MyTensor` class that interacts with the `ov::Tensor` class, follow these steps:
+ - The class should facilitate construction from an ov::Tensor instance and allow initialization from a JavaScript element type and shape.
+ - It should also provide a getElementType method that retrieves the ov::Tensor element type.
+
+Begin by creating a header file for the `MyTensor` class in the OpenVINO repository at `<openvino_repo>/src/bindings/js/node/include/my_tensor.hpp`. This file should contain the necessary includes and class definitions:
+```cpp
+class MyTensor : public Napi::ObjectWrap<MyTensor> {
+public:
+    // Constructor for the wrapper class 
+    MyTensor(const Napi::CallbackInfo& info);
+
+    // It returns a JavaScript class definition
+    static Napi::Function get_class(Napi::Env env);
+
+    // It returns the element type of ov::Tensor
+    Napi::Value get_element_type(const Napi::CallbackInfo& info);
+
+private:
+    ov::Tensor _tensor;
+};
+```
+The implementation of the class methods should be placed in a source file at `<openvino_repo>/src/bindings/js/node/src/my_tensor.cpp`
+```cpp
+MyTensor::MyTensor(const Napi::CallbackInfo& info) : Napi::ObjectWrap<MyTensor>(info) {
+    std::vector<std::string> allowed_signatures;
+
+    try {
+        if (ov::js::validate<Napi::String, Napi::Array>(info, allowed_signatures)) {
+            const auto type = js_to_cpp<ov::element::Type_t>(info, 0);
+            const auto& shape = js_to_cpp<ov::Shape>(info, 1);
+            this->_tensor = ov::Tensor(type, shape);
+        } else {
+            OPENVINO_THROW("'MyTensor' constructor", ov::js::get_parameters_error_msg(info, allowed_signatures));
+        }
+    } catch (std::exception& err) {
+        reportError(info.Env(), err.what());
+    }
+}
+
+Napi::Function MyTensor::get_class(Napi::Env env) {
+    return DefineClass(env,
+                       "MyTensor",
+                       {
+                           InstanceMethod("getElementType", &MyTensor::get_element_type),
+                       });
+}
+
+Napi::Value MyTensor::get_element_type(const Napi::CallbackInfo& info) {
+    return Napi::String::New(info.Env(), _tensor.get_element_type().to_string());
+}
+```
+Finally, update the `CMakeLists.txt` file at `<openvino_repo>/src/bindings/js/node/` to include the new source file in the build process:
+```cmake
+add_library(${PROJECT_NAME} SHARED
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/my_tensor.cpp
+)
+```
+
+### Argument validation and conversion
+
+When binding JavaScript arguments with C++ functions, it is crucial to validate and convert the arguments appropriately. The template `ov::js::validate` function is a utility that facilitates this process. It is particularly useful for handling different overloads of functions and ensuring standardized error messages when arguments do not match expected signatures.
+Before implementing a new conversion function, such as `js_to_cpp<ov::Shape>`, review the existing [helper methods](../../node/include/helper.hpp) to see if one already meets your requirements.
+
+### New class initialization
+When a new class is introduced to the `openvino-node` module, it must be initialized upon module loading. This is done in the [addon.cpp](../../src/addon.cpp) file. The initialization process registers the class with the Node.js environment so that it can be used within JavaScript code.
+```cpp
+Napi::Object init_module(Napi::Env env, Napi::Object exports) {
+    auto addon_data = new AddonData();
+    env.SetInstanceData<AddonData>(addon_data);
+    init_class(env, exports, "MyTensor", &MyTensor::get_class, addon_data->my_tensor);
+
+    return exports;
+}
+```
+To keep track of the JavaScript class definitions, they are kept in `<openvino_repo>/src/bindings/js/node/include/addon.hpp`.
+```cpp
+struct AddonData {
+    Napi::FunctionReference my_tensor;
+     // and other class references
+};
+```
+
+### Document the new functionality
+The last step is to add the TypeScript type definitions and describe the new functionality.
+```typescript
+/**
+ * The {@link MyTensor} class and its documentation.
+ */
+interface MyTensor {
+  /**
+   * It gets the tensor element type.
+   */
+  getElementType(): element;
+
+}
+interface MyTensorConstructor {
+  /**
+   * It constructs a tensor using the element type and shape. The new tensor
+   * data will be allocated by default.
+   * @param type The element type of the new tensor.
+   * @param shape The shape of the new tensor.
+   */
+  new(type: element | elementTypeString, shape: number[]): MyTensor;
+}
+
+export interface NodeAddon {
+  MyTensor: MyTensorConstructor,
+}
+```
+
+
+## Testing the new code
+
+Now that coding is finished, remember to rebuild the project and test it out.
+
+To learn how to test your code, refer to the guide on [how to test OpenVINO™ JavaScript API.](./test_examples.md) 
+
+## See also
+ * [OpenVINO™ README](../../../../README.md)
+ * [OpenVINO™ bindings README](../../README.md)
+ * [Developer documentation](../../../../docs/dev/index.md)
\ No newline at end of file
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+# How to test the OpenVINO™ JavaScript API
+
+## Build the OpenVINO™ JavaScript API 
+For detailed build instructions, refer to the [OpenVINO™ JavaScript API documentation](./README.md).
+
+
+## Run OpenVINO™ JavaScript API tests
+*For simplicity, begin by navigating to the [main JavaScript API folder](./../node):*
+```shell
+cd <openvino_repo>/src/bindings/js/node
+```
+
+Use this command to run OpenVINO JavaScript API tests:
+```shell
+npm run test
+```
+
+To run specific test files, you can pass one or more glob patterns:
+```shell
+node --test "tests/unit/core.test.js" "tests/unit/*model.test.js" 
+```
+
+Before executing individual test files, a one-time setup is required. If you have not previously executed `npm run test`, initiate the setup by running the following command:
+
+```shell
+npm run test_setup
+``` 
+
+More information on running tests from the command line can be found in the [Node.js documentation]( https://nodejs.org/docs/latest/api/test.html#running-tests-from-the-command-line).
+
+
+## Check the code style of the JavaScript API
+*ESLint* is a tool to enforce a consistent coding style and to identify and fix potential issues in JavaScript code.
+
+To check the code style of the JavaScript API, run the following commands:
+```shell
+npm run lint
+```
+*ESLint* can automatically fix many of the issues it detects. Use following command to run *ESLint* with the fix option on a single file:
+```shell
+npx eslint --fix "tests/unit/core.test.js"
+```
+
+It is recommended to run the code style check each time new tests are added.
+
+
+## Writing OpenVINO™ JavaScript API tests
+### Before start
+Follow and complete [Examples of OpenVINO™ JavaScript API code](./code_examples.md).
+
+
+
+### Adding new test-case in the correct place
+Each new test should verify the correct behavior of the new functionality (e.g. class, method).
+
+Unit test files are located in the `<openvino_repo>/src/bindings/js/node/tests/unit/` directory and their names correspond to the class/module to be tested.
+
+Always add tests to the correct locations and create new files only when necessary. *Remember to include the license on top of each new file*.
+
+### Test writing guidelines 
+Each test file starts with a `describe` block to group all tests related to a specific class or module. The name of the `describe` block should match the name of the class or module being tested, for example *ov.Core tests*.
+
+Within the `describe` block, individual tests are defined using `test` or `it` blocks, with the name of the test reflecting what is being tested. If multiple tests relate to the same method, they can be grouped within a nested `describe` block.
+
+ ```js
+ const { describe, it, beforeEach } = require('node:test');
+describe('ov.Tensor tests', () => {
+  test('MyTensor.getElementType()', () => {
+    const tensor = new ov.MyTensor(ov.element.f32, [1, 3]);
+    assert.strictEqual(tensor.getElementType(), ov.element.f32);
+  });
+
+});
+ ```
+When writing tests, keep the following best practices in mind:
+
+ * Focus on testing general usage and edge cases, but avoid excessive testing that leads to redundant test cases and can slow down validation pipelines.
+  * Avoid initializing shared variables outside of `test` or `beforeEach` blocks to prevent tests from affecting each other.
+ * Do not test built-in language features; instead, focus on the functionality provided by your code.
+ * Use hardcoded expected results to verify the correctness of your code. Alternatively, generate reference values at runtime using reliable libraries or methods.
+ * Extract and reuse common code snippets, such as helper functions or setup code, to improve test readability and maintainability.
+
+
+## See also
+ * [OpenVINO™ README](../../../../README.md)
+ * [OpenVINO™ bindings README](../../README.md)
+ * [Developer documentation](../../../../docs/dev/index.md)