Add project files.

test/integration/Elsa.JavaScript.IntegrationTests/ToJsonTests.cs

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+using System.Text.Json;
+using Elsa.Expressions.Models;
+using Elsa.JavaScript.Contracts;
+using Elsa.Testing.Shared;
+using Elsa.Workflows.Memory;
+using Microsoft.Extensions.DependencyInjection;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace Elsa.JavaScript.IntegrationTests;
+
+public class ToJsonTests(ITestOutputHelper testOutputHelper)
+{
+    private readonly IServiceProvider _serviceProvider = new TestApplicationBuilder(testOutputHelper).Build();
+
+    [Fact(DisplayName = "Serialize large unicode string using JavaScript's toJson function")]
+    public async Task Test1()
+    {
+        var javaScriptEvaluator = _serviceProvider.GetRequiredService<IJavaScriptEvaluator>();
+        var unicodeString = UnicodeRangeGenerator.GenerateUnicodeString();
+        var script = $"toJson({{ text: '{unicodeString}' }})";
+        var expressionExecutionContext = new ExpressionExecutionContext(_serviceProvider, new MemoryRegister());
+        var result = (string)(await javaScriptEvaluator.EvaluateAsync(script, typeof(string), expressionExecutionContext))!;
+        var serializedText = JsonDocument.Parse(result).RootElement.GetProperty("text").GetString();
+        Assert.Equal(unicodeString, serializedText);
+    }
+
+    [Fact(DisplayName = "Serialize large unicode string using JavaScript's toJson function from a workflow variable")]
+    public async Task Test2()
+    {
+        var javaScriptEvaluator = _serviceProvider.GetRequiredService<IJavaScriptEvaluator>();
+        var expressionExecutionContext = new ExpressionExecutionContext(_serviceProvider, new MemoryRegister());
+        var unicodeString = UnicodeRangeGenerator.GenerateUnicodeString();
+        var payloadVariable = new Variable<object>("Payload", null!);
+        var payload = new
+        {
+            Text = unicodeString
+        };
+        payloadVariable.Set(expressionExecutionContext, payload);
+        var script = "toJson(getPayload())";
+        var result = (string)(await javaScriptEvaluator.EvaluateAsync(script, typeof(string), expressionExecutionContext))!;
+        var serializedText = JsonDocument.Parse(result).RootElement.GetProperty("Text").GetString();
+        Assert.Equal(unicodeString, serializedText);
+    }
+}