Implemented DLSiteClient.

JSMR.Tests/Utilities/ResourceHelper.cs

@@ -0,0 +1,23 @@
+using System.Reflection;
+using System.Text;
+
+namespace JSMR.Tests.Utilities;
+
+public static class ResourceHelper
+{
+    /// <summary>
+    /// Reads an embedded resource from the calling assembly.
+    /// </summary>
+    /// <param name="resourceName">The full resource name, e.g. "MyNamespace.Folder.sample.json".</param>
+    public static async Task<string> ReadAsync(string resourceName)
+    {
+        Assembly assmbly = Assembly.GetExecutingAssembly();
+
+        using Stream? stream = assmbly.GetManifestResourceStream(resourceName)
+            ?? throw new FileNotFoundException($"Resource '{resourceName}' not found.");
+
+        using StreamReader reader = new(stream, Encoding.UTF8);
+
+        return await reader.ReadToEndAsync();
+    }
+}