Luan Taraschi c5d382ee81 test(visualization): isolate optional dependency mocks (#897) ...

* test(visualization): isolate optional dependency mocks

* test(visualization): stop requiring Plotly in unit tests

Removing the global sys.modules stubs left the tests that patch
`...go.Bar`, or call a visualizer, with nothing standing in for the
module level `px` and `go` aliases. Those are None when Plotly is
missing, so patch resolution and _check_dependencies() both failed.

Add a helper that substitutes a double only for the aliases that are
None, leaving the real module in place when Plotly is installed.

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2026-08-20 17:58:20 +05:00

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