diff --git a/dbt/include/hive/macros/utils/right.sql b/dbt/include/hive/macros/utils/right.sql
index 10b0006..e5f00c4 100644
--- a/dbt/include/hive/macros/utils/right.sql
+++ b/dbt/include/hive/macros/utils/right.sql
@@ -16,7 +16,7 @@
 {% macro hive__right(string_text, length_expression) %}
 
     case when {{ length_expression }} = 0
-        then NULL
+        then ''
     else
         substr(
         {{ string_text }},
diff --git a/tests/functional/adapter/test_utils.py b/tests/functional/adapter/test_utils.py
index 429103c..38932c3 100644
--- a/tests/functional/adapter/test_utils.py
+++ b/tests/functional/adapter/test_utils.py
@@ -237,32 +237,8 @@ def models(self):
         }
 
 
-models__test_concat_sql = """
-with util_data as (
-
-    select * from {{ ref('data_concat') }}
-
-)
-
-select
-    {{ concat(['input_1', 'input_2']) }} as actual,
-    output as expected
-
-from util_data
-"""
-
-
 class TestConcat(BaseConcat):
-    @pytest.fixture(scope="class")
-    def seeds(self):
-        return {"data_concat.csv": seeds__data_concat_csv}
-
-    @pytest.fixture(scope="class")
-    def models(self):
-        return {
-            "test_concat.yml": models__test_concat_yml,
-            "test_concat.sql": self.interpolate_macro_namespace(models__test_concat_sql, "concat"),
-        }
+    pass
 
 
 models__test_dateadd_sql = """
@@ -389,32 +365,8 @@ class TestExcept(BaseExcept):
     pass
 
 
-models__test_hash_sql = """
-with util_data as (
-
-    select * from {{ ref('data_hash') }}
-
-)
-
-select
-    {{ hash('input_1') }} as actual,
-    output as expected
-
-from util_data
-"""
-
-
 class TestHash(BaseHash):
-    @pytest.fixture(scope="class")
-    def seeds(self):
-        return {"data_hash.csv": seeds__data_hash_csv}
-
-    @pytest.fixture(scope="class")
-    def models(self):
-        return {
-            "test_hash.yml": models__test_hash_yml,
-            "test_hash.sql": self.interpolate_macro_namespace(models__test_hash_sql, "hash"),
-        }
+    pass
 
 
 class TestIntersect(BaseIntersect):
@@ -642,28 +594,8 @@ def models(self):
         }
 
 
-models__test_right_sql = """
-with util_data as (
-    select * from {{ ref('data_right') }}
-)
-select
-    {{ right('string_text', 'length_expression') }} as actual,
-    coalesce(output, '') as expected
-from util_data
-"""
-
-
 class TestRight(BaseRight):
-    @pytest.fixture(scope="class")
-    def seeds(self):
-        return {"data_right.csv": seeds__data_right_csv}
-
-    @pytest.fixture(scope="class")
-    def models(self):
-        return {
-            "test_right.yml": models__test_right_yml,
-            "test_right.sql": self.interpolate_macro_namespace(models__test_right_sql, "right"),
-        }
+    pass
 
 
 models__test_safe_cast_sql = """