Suggestion - Improving Unit Tests for Pre-Release Assessments in yfinance

[RavenTress]

The yfinance library frequently experiences breaking changes every few weeks/months. These issues often arise due to upstream modifications in Yahoo Finance’s API, data formatting changes, or internal library updates. Robust unit tests are necessary to detect these issues before pushing releases.

Expand Test Coverage

Add mocked responses to cover edge cases such as missing fields, NaN values, and API throttling.
Include integration tests that verify real-world data parsing with controlled test cases.
Validate multiple ticker types (e.g., stocks, ETFs, indices, and forex pairs).

Pre-Release Regression Suite

Introduce a pre-release test suite that runs comprehensive validation across historical and real-time data.
Ensure consistency checks between previous and current API responses.

Automated Data Integrity Checks

Compare historical vs. live data for discrepancies.
Verify column schema stability (prevent silent format changes).
Test against a static reference dataset (expected values).

And much more --