Integration tests for Similarity Search API.

[kol3x]

Closes #430

Hello! I am glad to take part in your challenge program. I started with the easiest one, but I plan to try harder ones later.

My process was:

• Read the CloudFlare documentation
• Looked throw the Similarity Search code to understand how it works
• Started building tests

I ended up making two new tests out of an authentication test that was already there, to cover all cases. Plus I added tests for validation and functionality.

One more thing to consider is that we are currently using vitest 1.2, but the docs mention that they only support 1.5. I haven't upgraded the package, as I wanted to consult first.

[kol3x]

@Lavriz Let me know your thoughts on this

[Lavriz]

@Lavriz Let me know your thoughts on this

hey! sorry for the delay, you're absolutely right on upgrading the version! thanks for noticing it

[kol3x]

@Lavriz Let me know your thoughts on this

hey! sorry for the delay, you're absolutely right on upgrading the version! thanks for noticing it

I included the vitest upgrade, let me know if there's anything else needed

[kol3x]

Putting this on draft for now, as Evgeny pointed out that additional tests for vectorization and vector DB querying should be added. I've researched Cloudflare docs on how to properly test auxiliary workers, but no success yet.

[kol3x]

• Added tests for vectorization and DB querying
• Added a vectorized sample for response to be tested against, generated by the same model that's used in the service
• Removed test, that was supposed to cover case where there is no API key set in environment. I am not sure if this is correct, but I couldn't figure out a way to unset environment variable for this particular test, so it always failed

[kol3x]

Figured out how workers mocks work, now tests actually pass...