add four new tests in test_utils from dbt-tests-adapter v1.6.0

- mention this adapter works with v1.6.x in README

README.md

@@ -34,6 +34,7 @@ Use the right version. Starting with the release of dbt-core 1.0.0,
 versions of dbt-sqlite are aligned to the same major+minor
 [version](https://semver.org/) of dbt-core.
 
+- versions 1.6.x of this adapter work with dbt-core 1.6.x
 - versions 1.5.x of this adapter work with dbt-core 1.5.x
 - versions 1.4.x of this adapter work with dbt-core 1.4.x
 - versions 1.3.x of this adapter work with dbt-core 1.3.x

tests/functional/adapter/utils/test_utils.py

@@ -33,7 +33,9 @@
 from dbt.tests.adapter.utils.test_safe_cast import BaseSafeCast
 from dbt.tests.adapter.utils.test_split_part import BaseSplitPart
 from dbt.tests.adapter.utils.test_string_literal import BaseStringLiteral
-
+from dbt.tests.adapter.utils.test_equals import BaseEquals
+from dbt.tests.adapter.utils.test_null_compare import BaseMixedNullCompare, BaseNullCompare
+from dbt.tests.adapter.utils.test_validate_sql import BaseValidateSqlMethod
 
 class TestAnyValue(BaseAnyValue):
     pass
@@ -213,3 +215,15 @@ class TestSplitPart(BaseSplitPart):
 
 class TestStringLiteral(BaseStringLiteral):
     pass
+
+class TestEquals(BaseEquals):
+    pass
+
+class TestMixedNullCompare(BaseMixedNullCompare):
+    pass
+
+class TestNullCompare(BaseNullCompare):
+    pass
+
+class TestValidateSqlMethod(BaseValidateSqlMethod):
+    pass