In dbt, a singular test is any SQL file placed directly inside the tests/ directory—not inside the tests/generic/ folder. Singular tests contain a custom SQL query where returning any rows means failure. They are distinct from generic tests, which are YAML-defined and live inside the generic directory, often referencing macros.

Looking at the folder structure:

In tests/generic/

furniture_customers_test.sql → This is a generic test, not a singular test.

In the root tests/ directory

macro_stg_tpch_orders_assert_pos_price.sql → singular test

macro_stg_tpch_suppliers_assert_pos_acct_bal.sql → singular test

stg_tpch_orders_assert_positive_price.sql → singular test

When you run:

dbt test --select 'test_type:singular'

dbt selects only singular tests, meaning tests that are individually written SQL files in the top-level tests/ directory.

Therefore, dbt will run:

macro_stg_tpch_orders_assert_pos_price

macro_stg_tpch_suppliers_assert_pos_acct_bal

stg_tpch_orders_assert_positive_price

It will not run furniture_customers_test, because that file is inside tests/generic/, which is reserved for template-based generic tests and is not classified as singular.

Thus, the correct answer is Option C.