feat: add test cases for controller helper

[block902]

Task:

Add test cases for controller helper contract

Description

Add these test cases

• mint + sell using 100% of proceeds as collateral (with 0 additional ETH sent)
• mint + sell using X% of proceeds as collateral (with 0 additional ETH sent)

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Document update

How Has This Been Tested

It returns error for the test cases. Tested locally

Checklist

• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] My changes generate no new warnings
• [ ] Added video recordings if it is a UI change

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