feat: parse content text (base case).

InkBlot.Tests/Helpers.cs

@@ -0,0 +1,15 @@
+using System.Text;
+
+namespace InkBlot.Tests;
+
+/// <summary>
+///     A file reader where the contents are directly provided as strings.
+/// </summary>
+/// <param name="filesToContents">A map between file names and their contents.</param>
+internal class PreMadeFileReader((string, string)[] filesToContents) : IFileReader
+{
+    public Stream GetContents(string filename)
+    {
+        return new MemoryStream(Encoding.UTF8.GetBytes(filesToContents.First(e => e.Item1 == filename).Item2));
+    }
+}