Fix test suite file writers

server/src/config/tests.rs

@@ -831,7 +831,7 @@ mod modeset_de {
         let e = toml::from_str::<Example>(toml).unwrap_err();
         assert_eq!(
             e.to_string(),
-            "Bad value `superuser` for modeset for key `mode` at line 1 column 6"
+            "TOML parse error at line 1, column 6\n  |\n1 | mode=\"superuser\"\n  |      ^^^^^^^^^^^\nBad value `superuser` for modeset\n"
         );
     }
 }

server/src/engine/storage/v1/tests.rs

@@ -109,7 +109,11 @@ impl RawFileIOInterface for VirtualFileInterface {
     fn fwrite_all(&mut self, bytes: &[u8]) -> super::SDSSResult<()> {
         vfs(&self.0, |f| {
             assert!(f.write);
-            f.data_mut().write_all(bytes)?;
+            if f.data.len() < bytes.len() {
+                f.data.extend(bytes);
+            } else {
+                f.data_mut().write_all(bytes)?;
+            }
             Ok(())
         })
     }