test: add unit, smoke tests for custom search command

[hetangmodi-crest]

Issue number:
ADDON-76780

PR Type

What kind of change does this PR introduce?

• Feature
• Bug Fix
• Refactoring (no functional or API changes)
• Documentation Update
• Maintenance (dependency updates, CI, etc.)

Summary

This PR contains the test cases for the custom search command feature.
Dev changes for custom search command : PR #1653

Changes

Smoke and unit test cases are respectively added for the feature of custom search command.

User experience

No change in User experience as this PR contains only test cases.

Checklist

If an item doesn't apply to your changes, leave it unchecked.

Review

• self-review - I have performed a self-review of this change according to the development guidelines
• Changes are documented. The documentation is understandable, examples work (more info)
• PR title and description follows the contributing principles
• meeting - I have scheduled a meeting or recorded a demo to explain these changes (if there is a video, put a link below and in the ticket)

Tests

See the testing doc.

• Unit - tests have been added/modified to cover the changes
• Smoke - tests have been added/modified to cover the changes
• UI - tests have been added/modified to cover the changes
• coverage - I have checked the code coverage of my changes (see more)

Demo/meeting:

Reviewers are encouraged to request meetings or demos if any part of the change is unclear

[hetangmodi-crest]

Closing this PR as the following changes are covered in
PR #1693 : Contains base code for supporting custom search command.
PR #1694 : Contains logic and test cases for the generation of commands.conf.
PR #1695 : Contains logic and test cases for the generation of searchbnf.conf.
PR #1697 : Contains logic and test cases for the generation of Python files.