Markduckworth/ppl mep

[MarkDuckworth]

Hey there! So you want to contribute to a Firebase SDK?
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  If not, go file an issue about this before creating a pull request to discuss.

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• If you fixed a bug or added a feature, add a new test to cover your code.

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[github-actions]

Vertex AI Mock Responses Check ⚠️

A newer major version of the mock responses for Vertex AI unit tests is available. update_vertexai_responses.sh should be updated to clone the latest version of the responses: v6.1