[Task] Increase Unit Test Coverage for statistics.py (Demographics & Zipcodes)

[saiudayagiri]

Problem Statement

Problem

The statistics.py module currently has several logic paths that are not covered by unit tests from the codecov report.

Proposed Changes

Add unit tests to esp/program/tests/test_statistics.py

Impact

• Increases code coverage for the program module.
• Prevents regressions in the demographics reporting dashboard.
• Uses SimpleNamespace for lightweight mocking to keep tests fast.

Proposed Solution

• Add unit tests to esp/program/tests/test_statistics.py
• Increases code coverage for the program module.

Alternatives Considered

No response

Additional Context

No response

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[saiudayagiri]

/assign

[github-actions]

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