diff -Naur a/src/test.rs b/src/test.rs
--- a/src/test.rs	1969-12-31 16:00:00.000000000 -0800
+++ b/src/test.rs	2021-06-16 08:12:25.653600395 -0700
@@ -92,7 +92,7 @@
         &self,
         interface: &str,
         p: P,
-        content: usize,
+        content: u64,
     ) {
         let interface_dir = self.path().join(interface);
         if !interface_dir.exists() {