These functions can be used as inputs for test_collection() and
transform_and_check().
style_empty(text)style_op(text)
A character vector to transform.
style_empty: Nest and unnest text without applying any
transformations but remove EOL spaces and indention due to the way the
serialization is set up.
style_op: Transformations for indention based on operators
As inputs for test_collection(), we can also use top-level functions such
as style_text().