Prefer this function over AdvanceChainByNBlocks b/c it doesn't require cast to be installed on the host machine, whereas this one doesn't.

Create a new instance of `TestData` with the given input data.

NewTestLogger is just a utility function to create a logger for testing It returns an slog textHandler logger that outputs to os.Stdout, with source code information and debug level.

Test data for generic loading of JSON data files.