[Playground] Increase test coverage for the preparers package
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Description
Need to add unit tests to increase test coverage for the _preparers_ package.
Imported from Jira [BEAM-13879](https://issues.apache.org/jira/browse/BEAM-13879). Original Jira may contain additional context.
Reported by: Aydar Zaynutdinov.
Subtask of issue #21288
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