WIP: Tests for get_powers_of_two macro

Running into an issue where get_powersof_two is complaining that it's
getting a string for the `uppoer_bound` variable, and I don't know why.

Error:
```
E           dbt.exceptions.CaughtMacroErrorWithNodeError: Compilation Error in model test_get_powers_of_two (models/test_get_powers_of_two.sql)
E             '<=' not supported between instances of 'str' and 'int'
E
E             > in macro get_powers_of_two (macros/utils/generate_series.sql)
E             > called by model test_get_powers_of_two (models/test_get_powers_of_two.sql)
```

tests/adapter/dbt/tests/adapter/utils/fixture_get_powers_of_two.py

@@ -0,0 +1,39 @@
+# dateadd
+
+seeds__data_get_powers_of_two_csv = """upper_bound,result
+1,1
+4,2
+27,5
+256,8
+3125,12
+46656,16
+823543,20
+16777216,24
+387420489,29
+"""
+
+
+models__test_get_powers_of_two_sql = """
+with data as (
+  select
+    cast({{ 'upper_bound' }} as {{ type_int() }}) as upper_bound,
+    cast({{ 'result' }} as {{ type_int() }}) as result
+  from {{ ref('data_get_powers_of_two') }}
+
+)
+
+select
+    {{get_powers_of_two('upper_bound')}} as actual,
+    result as expected
+from data
+"""
+
+models__test_get_powers_of_two_yml = """
+version: 2
+models:
+  - name: test_powers_of_two
+    tests:
+      - assert_equal:
+          actual: actual
+          expected: expected
+"""

tests/adapter/dbt/tests/adapter/utils/test_get_powers_of_two.py

@@ -0,0 +1,26 @@
+import pytest
+from dbt.tests.adapter.utils.base_utils import BaseUtils
+from dbt.tests.adapter.utils.fixture_get_powers_of_two import (
+    seeds__data_get_powers_of_two_csv,
+    models__test_get_powers_of_two_sql,
+    models__test_get_powers_of_two_yml,
+)
+
+
+class BaseGetPowersOfTwo(BaseUtils):
+    @pytest.fixture(scope="class")
+    def seeds(self):
+        return {"data_get_powers_of_two.csv": seeds__data_get_powers_of_two_csv}
+
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "test_get_powers_of_two.yml": models__test_get_powers_of_two_yml,
+            "test_get_powers_of_two.sql": self.interpolate_macro_namespace(
+                models__test_get_powers_of_two_sql, "get_powers_of_two"
+            ),
+        }
+
+
+class TestGetPowersOfTwo(BaseGetPowersOfTwo):
+    pass