Module hiero-base miss tests for functionality of SmartContractClientImpl.callContractFunction

[hendrikebbers]

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👾 Description of the issue

In the hiero-base module, the SmartContractClientImpl class implements the callContractFunction method to invoke a function on a deployed smart contract by specifying the contract ID, function name, and optional parameters. This method currently lacks unit and integration tests. Tests for scenarios such as valid contract IDs and function names, invalid or null parameters, and exception handling (e.g., HieroException) are missing, leaving this functionality unverified and prone to potential bugs.

Suggested solution

Create a new test class or extend the existing test suite for SmartContractClientImpl to include tests for the callContractFunction method. Follow the established testing pattern using JUnit to validate both positive and negative scenarios for this method.

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[Agaba-derrick]

@hendrikebbers @Ndacyayisenga-droid Am currently working on this issue, may I please be assigned ?