diff --git a/dbt-tests-adapter/dbt/tests/adapter/incremental/test_incremental_unique_id.py b/dbt-tests-adapter/dbt/tests/adapter/incremental/test_incremental_unique_id.py
index bddf407e..34807062 100644
--- a/dbt-tests-adapter/dbt/tests/adapter/incremental/test_incremental_unique_id.py
+++ b/dbt-tests-adapter/dbt/tests/adapter/incremental/test_incremental_unique_id.py
@@ -240,6 +240,8 @@
 select 'NY','New York','Manhattan','2021-04-01'
 union all
 select 'PA','Philadelphia','Philadelphia','2021-05-21'
+union all
+select 'CO','Denver',null,'2021-06-18'
 
 """
 
@@ -265,6 +267,8 @@
 select 'NY','New York','Manhattan','2021-04-01'
 union all
 select 'PA','Philadelphia','Philadelphia','2021-05-21'
+union all
+select 'CO','Denver',null,'2021-06-18'
 
 """
 
@@ -288,6 +292,7 @@
 NY,Kings,Brooklyn,2021-04-02
 NY,New York,Manhattan,2021-04-01
 PA,Philadelphia,Philadelphia,2021-05-21
+CO,Denver,,2021-06-18
 """
 
 seeds__add_new_rows_sql = """
@@ -439,7 +444,7 @@ def fail_to_build_inc_missing_unique_key_column(self, incremental_model_name):
     def test__no_unique_keys(self, project):
         """with no unique keys, seed and model should match"""
 
-        expected_fields = self.get_expected_fields(relation="seed", seed_rows=8)
+        expected_fields = self.get_expected_fields(relation="seed", seed_rows=9)
         test_case_fields = self.get_test_fields(
             project, seed="seed", incremental_model="no_unique_key", update_sql_file="add_new_rows"
         )
@@ -449,7 +454,7 @@ def test__no_unique_keys(self, project):
     def test__empty_str_unique_key(self, project):
         """with empty string for unique key, seed and model should match"""
 
-        expected_fields = self.get_expected_fields(relation="seed", seed_rows=8)
+        expected_fields = self.get_expected_fields(relation="seed", seed_rows=9)
         test_case_fields = self.get_test_fields(
             project,
             seed="seed",
@@ -462,7 +467,7 @@ def test__one_unique_key(self, project):
         """with one unique key, model will overwrite existing row"""
 
         expected_fields = self.get_expected_fields(
-            relation="one_str__overwrite", seed_rows=7, opt_model_count=1
+            relation="one_str__overwrite", seed_rows=8, opt_model_count=1
         )
         test_case_fields = self.get_test_fields(
             project,
@@ -487,7 +492,7 @@ def test__bad_unique_key(self, project):
     def test__empty_unique_key_list(self, project):
         """with no unique keys, seed and model should match"""
 
-        expected_fields = self.get_expected_fields(relation="seed", seed_rows=8)
+        expected_fields = self.get_expected_fields(relation="seed", seed_rows=9)
         test_case_fields = self.get_test_fields(
             project,
             seed="seed",
@@ -500,7 +505,7 @@ def test__unary_unique_key_list(self, project):
         """with one unique key, model will overwrite existing row"""
 
         expected_fields = self.get_expected_fields(
-            relation="unique_key_list__inplace_overwrite", seed_rows=7, opt_model_count=1
+            relation="unique_key_list__inplace_overwrite", seed_rows=8, opt_model_count=1
         )
         test_case_fields = self.get_test_fields(
             project,
@@ -515,7 +520,7 @@ def test__duplicated_unary_unique_key_list(self, project):
         """with two of the same unique key, model will overwrite existing row"""
 
         expected_fields = self.get_expected_fields(
-            relation="unique_key_list__inplace_overwrite", seed_rows=7, opt_model_count=1
+            relation="unique_key_list__inplace_overwrite", seed_rows=8, opt_model_count=1
         )
         test_case_fields = self.get_test_fields(
             project,
@@ -530,7 +535,7 @@ def test__trinary_unique_key_list(self, project):
         """with three unique keys, model will overwrite existing row"""
 
         expected_fields = self.get_expected_fields(
-            relation="unique_key_list__inplace_overwrite", seed_rows=7, opt_model_count=1
+            relation="unique_key_list__inplace_overwrite", seed_rows=8, opt_model_count=1
         )
         test_case_fields = self.get_test_fields(
             project,
@@ -545,7 +550,7 @@ def test__trinary_unique_key_list_no_update(self, project):
         """even with three unique keys, adding distinct rows to seed does not
         cause seed and model to diverge"""
 
-        expected_fields = self.get_expected_fields(relation="seed", seed_rows=8)
+        expected_fields = self.get_expected_fields(relation="seed", seed_rows=9)
         test_case_fields = self.get_test_fields(
             project,
             seed="seed",