Write tests for Array class

I would like to write tests fro array class.

ISSUE=nodejs#332

test/basic_types/array.cc

@@ -0,0 +1,41 @@
+#define NAPI_EXPERIMENTAL
+#include "napi.h"
+
+using namespace Napi;
+
+Value CreateArray(const CallbackInfo& info) {
+  if (info.Length() > 0) {
+    size_t length = info[0].As<Number>().Uint32Value();
+	  return Array::New(info.Env(), length);
+  } else {
+	  return Array::New(info.Env());
+  }
+}
+
+Value GetLength(const CallbackInfo& info) {
+  Array array = info[0].As<Array>();
+  return Number::New(info.Env(), static_cast<uint32_t>(array.Length()));
+}
+
+Value GetElement(const CallbackInfo& info) {
+  Array array = info[0].As<Array>();
+  size_t index = info[1].As<Number>().Uint32Value();
+	return array[index];
+}
+
+void SetElement(const CallbackInfo& info) {
+  Array array = info[0].As<Array>();
+  size_t index = info[1].As<Number>().Uint32Value();
+	array[index] = info[2].As<Value>();
+}
+
+Object InitBasicTypesArray(Env env) {
+  Object exports = Object::New(env);
+
+  exports["createArray"] = Function::New(env, CreateArray);
+  exports["getLength"] = Function::New(env, GetLength);
+  exports["get"] = Function::New(env, GetElement);
+  exports["set"] = Function::New(env, SetElement);
+
+  return exports;
+}

test/basic_types/array.js

@@ -0,0 +1,37 @@
+'use strict';
+const buildType = process.config.target_defaults.default_configuration;
+const assert = require('assert');
+
+test(require(`../build/${buildType}/binding.node`));
+test(require(`../build/${buildType}/binding_noexcept.node`));
+
+function test(binding) {
+
+  // create empty array
+  const array = binding.basic_types_array.createArray();
+  assert.strictEqual(binding.basic_types_array.getLength(array), 0);
+
+  // create arrry with length
+	const arrayWithLength = binding.basic_types_array.createArray(10);
+  assert.strictEqual(binding.basic_types_array.getLength(arrayWithLength), 10);
+
+  // set function test
+  binding.basic_types_array.set(array, 0, 10);
+  binding.basic_types_array.set(array, 1, "test");
+  binding.basic_types_array.set(array, 2, 3.0);
+
+  // check length after set data
+  assert.strictEqual(binding.basic_types_array.getLength(array), 3);
+
+  // get function test
+  assert.strictEqual(binding.basic_types_array.get(array, 0), 10);
+  assert.strictEqual(binding.basic_types_array.get(array, 1), "test");
+  assert.strictEqual(binding.basic_types_array.get(array, 2), 3.0);
+
+  // overrite test
+  binding.basic_types_array.set(array, 0, 5);
+  assert.strictEqual(binding.basic_types_array.get(array, 0), 5);
+
+  // out of index
+  assert.strictEqual(binding.basic_types_array.get(array, 5), undefined);
+}

test/binding.cc

@@ -6,6 +6,7 @@ using namespace Napi;
 Object InitArrayBuffer(Env env);
 Object InitAsyncContext(Env env);
 Object InitAsyncWorker(Env env);
+Object InitBasicTypesArray(Env env);
 Object InitBasicTypesBoolean(Env env);
 Object InitBasicTypesNumber(Env env);
 Object InitBasicTypesValue(Env env);
@@ -34,6 +35,7 @@ Object Init(Env env, Object exports) {
   exports.Set("arraybuffer", InitArrayBuffer(env));
   exports.Set("asynccontext", InitAsyncContext(env));
   exports.Set("asyncworker", InitAsyncWorker(env));
+  exports.Set("basic_types_array", InitBasicTypesArray(env));
   exports.Set("basic_types_boolean", InitBasicTypesBoolean(env));
   exports.Set("basic_types_number", InitBasicTypesNumber(env));
   exports.Set("basic_types_value", InitBasicTypesValue(env));

test/binding.gyp

@@ -7,6 +7,7 @@
         'arraybuffer.cc',
         'asynccontext.cc',
         'asyncworker.cc',
+        'basic_types/array.cc',
         'basic_types/boolean.cc',
         'basic_types/number.cc',
         'basic_types/value.cc',

test/index.js

@@ -11,6 +11,7 @@ let testModules = [
   'arraybuffer',
   'asynccontext',
   'asyncworker',
+  'basic_types/array',
   'basic_types/boolean',
   'basic_types/number',
   'basic_types/value',