Use Snapshot Testing for WASM Inference Tests

[nordzilla]

We now have several test files in inference/wasm/tests/test-cases that compare before-and-after translations.

It would be a good idea to transition these test cases to use vitest's Snapshot capabilities, so that it is easy to change expected assertions when adding new models, or if models change, etc.

[gregtatum]

My preference from other projects is to use inline snapshots if possible. It makes it easier to review and maintain tests. They are a bit more magical though.

[nordzilla]

I would say that inline snapshots via data-driven test assertions is effectively what I've already implemented.

Does that mean that you're overall fine with the current format?

[gregtatum]

Yeah I'm fine with how things are implemented, but it won't work with the matchInlineSnapshot feature, as that rewrites the files in place:

import { expect, it } from 'vitest'

it('toUpperCase', () => {
  const result = toUpperCase('foobar')
  expect(result).toMatchInlineSnapshot('"FOOBAR"')
})

The benefits of snapshot testing is that the tests can be updated through an automated command as opposed to manually updating the examples yourself. I have found non-inline snapshot hard to use in the past as the expectations are separated from the actual results.