Run test against increasing file sizes

DistTestCore/ByteSize.cs

@@ -38,6 +38,11 @@ namespace DistTestCore
     {
         private const long Kilo = 1024;
 
+        public static ByteSize Bytes(this long i)
+        {
+            return new ByteSize(i);
+        }
+
         public static ByteSize KB(this long i)
         {
             return new ByteSize(i * Kilo);
@@ -58,6 +63,11 @@ namespace DistTestCore
             return (i * Kilo).GB();
         }
 
+        public static ByteSize Bytes(this int i)
+        {
+            return new ByteSize(i);
+        }
+
         public static ByteSize KB(this int i)
         {
             return Convert.ToInt64(i).KB();

Tests/BasicTests/ContinuousSubstitute.cs

@@ -61,17 +61,21 @@ namespace Tests.BasicTests
             }
         }
 
+        private ByteSize fileSize = 10.MB();
+
         private void PerformTest(IOnlineCodexNode primary, IOnlineCodexNode secondary)
         {
             ScopedTestFiles(() =>
             {
-                var testFile = GenerateTestFile(1000.MB());
+                var testFile = GenerateTestFile(fileSize);
 
                 var contentId = primary.UploadFile(testFile);
 
                 var downloadedFile = secondary.DownloadContent(contentId);
 
                 testFile.AssertIsEqual(downloadedFile);
+
+                fileSize = (fileSize.SizeInBytes * 2).Bytes();
             });
         }
     }