test: Improve Test Coverage in FLUTTER STADATA SDK

[ryanaidilp]

Description

In order to enhance the reliability and robustness of the FLUTTER STADATA SDK, we aim to improve its test coverage. While the SDK is functional, there are areas that lack adequate test coverage. This issue serves to identify these gaps and address them by adding new unit tests or modifying existing ones.

Requirements

• Identify areas in the codebase with insufficient test coverage.

• Develop new unit tests to cover these areas comprehensively.

• Ensure that the addition of new tests does not result in a drop in overall test coverage; the goal is to maintain or increase the current coverage.

• Any existing tests that are deemed insufficient or outdated should be updated or replaced accordingly.

By achieving a test coverage of at least 90%, we can ensure that the FLUTTER STADATA SDK remains reliable and stable for developers who rely on it.

This issue has been tagged as "hacktoberfest," "feature," and "help wanted" to encourage contributions from the open-source community. Your assistance in improving the SDK's test coverage is greatly appreciated!