Fix failing tests for #303 (unreleased)

[LinusU]

Fixes the failing tests introduced in #303. Since the Buffer was 4 bytes long these comparisons couldn't ever work before.

[junderw]

This is incorrect.

We expect the buffer to be 1 byte.

[LinusU]

This is incorrect.

We expect the buffer to be 1 byte.

This is doing .write to a Buffer that is already 4 bytes long. write cannot truncate the buffer so the buffer will still be 4 bytes...

[LinusU]

(failing CI adressed in #342)

[dcousens]

@LinusU can you rebase this?

[LinusU]

@dcousens done ✅

[dcousens]

LGTM