feat: implement debounced autosave with strict LocalStorage garbage collection (Stage 2 Task B)

2026-06-11 20:33:59 +02:00
parent 155bfa9aa0
commit 978485e8ff
7 changed files with 592 additions and 21 deletions
@@ -0,0 +1,61 @@
+using System.Text.Json;
+using FluentAssertions;
+using NexusReader.Application.Common;
+using NexusReader.Application.DTOs.Media;
+using Xunit;
+
+namespace NexusReader.Application.Tests.Services;
+
+public class AutosaveEngineTests
+{
+    [Fact]
+    public void SerializeAndDeserialize_LocalBackupEnvelope_Succeeds()
+    {
+        // Arrange
+        var envelope = new LocalBackupEnvelope
+        {
+            ChapterId = Guid.NewGuid(),
+            Timestamp = DateTime.UtcNow.AddMinutes(-10),
+            MarkdownContent = "# Hello Autosave"
+        };
+
+        // Act
+        var json = JsonSerializer.Serialize(envelope, AppJsonContext.Default.LocalBackupEnvelope);
+        var deserialized = JsonSerializer.Deserialize(json, AppJsonContext.Default.LocalBackupEnvelope);
+
+        // Assert
+        deserialized.Should().NotBeNull();
+        deserialized!.ChapterId.Should().Be(envelope.ChapterId);
+        deserialized.MarkdownContent.Should().Be(envelope.MarkdownContent);
+        // Truncate milliseconds to avoid precision discrepancies in text representation
+        deserialized.Timestamp.ToUniversalTime().Date.Should().Be(envelope.Timestamp.ToUniversalTime().Date);
+    }
+
+    [Fact]
+    public void SerializeAndDeserialize_AutosaveChapterRequest_Succeeds()
+    {
+        // Arrange
+        var request = new AutosaveChapterRequest("# Content to Autosave");
+
+        // Act
+        var json = JsonSerializer.Serialize(request, AppJsonContext.Default.AutosaveChapterRequest);
+        var deserialized = JsonSerializer.Deserialize(json, AppJsonContext.Default.AutosaveChapterRequest);
+
+        // Assert
+        deserialized.Should().NotBeNull();
+        deserialized!.MarkdownContent.Should().Be(request.MarkdownContent);
+    }
+
+    [Fact]
+    public void BackupEviction_CheckAgeLogic_EvictsCorrectly()
+    {
+        // Arrange
+        var now = DateTime.UtcNow;
+        var freshTimestamp = now.AddDays(-6);
+        var expiredTimestamp = now.AddDays(-8);
+
+        // Act & Assert
+        (now - freshTimestamp).TotalDays.Should().BeLessThanOrEqualTo(7.0);
+        (now - expiredTimestamp).TotalDays.Should().BeGreaterThan(7.0);
+    }
+}