You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

azure-data-factory-testing-framework
0.0.0a166

This version was deleted from PyPI around 2023-12-12. Installing fails with:
$ pip3 install azure-data-factory-testing-framework==0.0.0a166 ERROR: Could not find a version that satisfies the requirement azure-data-factory-testing-framework==0.0.0a166
View other deleted versions of azure-data-factory-testing-framework

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2023-12-11/ \ azure-data-factory-testing-framework==0.0.0a166
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Or, download files manually

And install manually via pip:
azure_data_factory_testing_framework-0.0.0a166-py3-none-any.whl (52.2KB)
azure_data_factory_testing_framework-0.0.0a166.tar.gz (25.6KB)