@tus/server: Split to multiple chunks on large incoming buffer

[mitjap]

When handling incoming request, each buffer length is 64kb which StreamSplitter can handle without issues.

But in tests we might create buffers much larger than single part size, which might not be split as expected.

Works:
const readStream = Readable.from(Buffer.alloc(expectedChunks * optimalChunkSize))

Doesn't work:
const readStream = Readable.from([Buffer.alloc(expectedChunks * optimalChunkSize)])

[Murderlon]

👌