Class-Transformer Node module version upgrade causing error in a specific unit test case which was working fine before the upgrade

Question

Node module : class-transformer

Version upgraded from 0.1.0 to 0.4.0

Upgraded using command: npm i class-tranformer@0.4.0

Issue: Upon the upgrade of the function I can see that application is running fine and 8983 of 8984 unit test cases are running successfully

Only one unit test case is failing The failed test case was passing with 0.1.0 version but started failing with 0.4.0 version

The test case is using a plainToClass method which is being used by other test cases where it was working fine.

Error: Expected unidentified to equal 'Up to $10'

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I tried to console log the result but not sure where I was going wrong. Can you please help me how to debug such issues.