You have 3 'p's in upper in the documentation, meaning the samples error when used

[Mark-Robinson]

For example, you have:

models: # or seeds:
  - name: my_model
    tests:
    - dbt_expectations.expect_table_columns_to_not_contain_set:
        column_list: ["col_a", "col_b"]
        transform: uppper # (Optional)

when really it should be:

models: # or seeds:
  - name: my_model
    tests:
    - dbt_expectations.expect_table_columns_to_not_contain_set:
        column_list: ["col_a", "col_b"]
        transform: upper # (Optional)

(Notice uppper vs upper)

[clausherther]

Thanks for flagging that typo, we'll get that fixed.