public final Jdbi getJdbi() {
        if (jdbi == null) {
            throw new IllegalStateException("jdbi is null!");
        }

        return jdbi;
    }
Returns a {@link Jdbi} instance linked to the data source used by this extension. There is only a single Jdbi instance and multiple calls to this method
return the same instance.

@return A {@link Jdbi} instance.
testing/src/main/java/org/jdbi/v3/testing/junit5/JdbiExtension.java