add network/file scalability test

Tests/CodexTests/ScalabilityTests/ScalabilityTests.cs

@@ -0,0 +1,43 @@
+using CodexPlugin;
+using NUnit.Framework;
+using Utils;
+
+namespace CodexTests.ScalabilityTests;
+
+[TestFixture]
+public class ScalabilityTests : CodexDistTest
+{
+    private const string PatchedImage = "codexstorage/nim-codex:sha-9aeac06-dist-tests";
+    private const string MasterImage = "codexstorage/nim-codex:sha-5380912-dist-tests";
+
+    [Test]
+    [Combinatorial]
+    public void ShouldMaintainFileInNetwork(
+        [Values(10, 20, 40, 80, 100)] int numberOfNodes,
+        [Values(100, 1000, 5000, 10000)] int fileSizeInMb,
+        [Values(true, false)] bool usePatchedImage
+    )
+    {
+        CodexContainerRecipe.DockerImageOverride = usePatchedImage ? PatchedImage : MasterImage;
+        
+        var bootstrap = AddCodex();
+        var nodes = AddCodex(numberOfNodes - 1,
+            s => s.WithBootstrapNode(bootstrap)).ToList();
+
+        var uploader = nodes.PickOneRandom();
+        var downloader = nodes.PickOneRandom();
+
+        var testFile = GenerateTestFile(fileSizeInMb.MB());
+        var contentId = uploader.UploadFile(testFile);
+        var downloadedFile = downloader.DownloadContent(contentId);
+
+        downloadedFile!.AssertIsEqual(testFile);
+
+        uploader.Stop(true);
+
+        var otherDownloader = nodes.PickOneRandom();
+        downloadedFile = otherDownloader.DownloadContent(contentId);
+
+        downloadedFile!.AssertIsEqual(testFile);
+    }
+}