Module hiero-base miss tests for functionality of ProtocolLayerClientImpl.executeTokenAssociateTransaction

[hendrikebbers]

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👾 Description of the issue

In the hiero-base module, the ProtocolLayerClientImpl class implements the executeTokenAssociateTransaction method, which associates a token with an account by interacting with the Hedera SDK. However, this method currently lacks unit and integration tests. Scenarios such as successful token association, invalid account or token IDs, and exception handling (e.g., HieroException) are untested, leaving this functionality vulnerable to potential issues.

Suggested solution

Create a new test class or extend the existing test suite for ProtocolLayerClientImpl to include tests for the executeTokenAssociateTransaction method. Use JUnit to validate positive scenarios like successful token association and negative scenarios such as invalid account or token IDs and error handling during token association.

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