desktop/WirelessTextSyncer.Windows.Tests/SyncMessageTests.cs

using System.Text.Json;
using WirelessTextSyncer.Windows.Models;
using WirelessTextSyncer.Windows.Services;

namespace WirelessTextSyncer.Windows.Tests;

[TestClass]
public sealed class SyncMessageTests
{
    [TestMethod]
    public void DeserializeAndroidInsertTextMessage()
    {
        var message = JsonSerializer.Deserialize<SyncMessage>(
            """{"action":"insertText","text":"hello"}""",
            new JsonSerializerOptions(JsonSerializerDefaults.Web));

        Assert.IsNotNull(message);
        Assert.AreEqual(SyncAction.InsertText, message.Action);
        Assert.AreEqual("hello", message.Text);
    }

    [TestMethod]
    public void DeserializeAndroidBackspaceMessage()
    {
        var message = JsonSerializer.Deserialize<SyncMessage>(
            """{"action":"backspace"}""",
            new JsonSerializerOptions(JsonSerializerDefaults.Web));

        Assert.IsNotNull(message);
        Assert.AreEqual(SyncAction.Backspace, message.Action);
    }

    [TestMethod]
    public void DeserializeAndroidReplaceAllMessage()
    {
        var message = JsonSerializer.Deserialize<SyncMessage>(
            """{"action":"replaceAll","text":"final text"}""",
            new JsonSerializerOptions(JsonSerializerDefaults.Web));

        Assert.IsNotNull(message);
        Assert.AreEqual(SyncAction.ReplaceAll, message.Action);
        Assert.AreEqual("final text", message.Text);
    }

    [TestMethod]
    public void ReplaceAllUsesFocusedTextReplacement()
    {
        var keyboard = new RecordingKeyboardInjectionService();
        var handler = new SyncMessageHandler(keyboard);

        handler.Handle(new SyncMessage
        {
            Action = SyncAction.ReplaceAll,
            Text = "final text"
        });

        CollectionAssert.AreEqual(
            new[] { "replace:final text" },
            keyboard.Calls);
    }

    private sealed class RecordingKeyboardInjectionService : IKeyboardInjectionService
    {
        public List<string> Calls { get; } = [];

        public void InsertText(string text)
        {
            Calls.Add($"insert:{text}");
        }

        public void ReplaceFocusedText(string text)
        {
            Calls.Add($"replace:{text}");
        }

        public void Backspace()
        {
            Calls.Add("backspace");
        }

        public void Enter()
        {
            Calls.Add("enter");
        }
    }
}