Added functional tests for seed files with a unique delimiter

tests/adapter/dbt/tests/adapter/simple_seed/fixtures.py

@@ -34,6 +34,10 @@
 models__downstream_from_seed_actual = """
 select * from {{ ref('seed_actual') }}
 
+"""
+models__downstream_from_seed_pipe_separated = """
+select * from {{ ref('seed_pipe_separated') }}
+
 """
 models__from_basic_seed = """
 select * from {{ this.schema }}.seed_expected