Adding solved plugin tests and automated tests

[lalmulai]

Implements Solved Plugin JSDOM automated tests. Feature developed as part of the assigned task for PR #15 .

Purpose:
The tests verify that the Solved Plugin functions correctly within a JSDOM environment without interfering with other forum functionality.
They ensure that:

• The Solved Plugin initializes correctly and registers all necessary hooks.
• Badge functions exist and can toggle as expected.
• DOM elements for solved posts are properly manipulated.
• The plugin does not break other page functionality when loaded.

Test File:
test/solved-plugin.test.js contains the automated test cases.

[coveralls]

Pull Request Test Coverage Report for Build 18431323583

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 65.254%

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Totals
Change from base Build 18430828788:	0.0%
Covered Lines:	54
Relevant Lines:	71

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💛 - Coveralls