diff --git a/src/codemodder/codemods/base_codemod.py b/src/codemodder/codemods/base_codemod.py
index a8f3d572..c5348c5a 100644
--- a/src/codemodder/codemods/base_codemod.py
+++ b/src/codemodder/codemods/base_codemod.py
@@ -1,4 +1,4 @@
-from dataclasses import dataclass, asdict
+from dataclasses import dataclass
 from enum import Enum
 import itertools
 from typing import List, ClassVar
@@ -30,25 +30,6 @@ class BaseCodemod:
     execution_context: CodemodExecutionContext
     file_context: FileContext
 
-    def __init_subclass__(cls, **kwargs):
-        super().__init_subclass__(**kwargs)
-
-        if "codemodder.codemods.base_codemod.SemgrepCodemod" in str(cls):
-            # hack: SemgrepCodemod won't NotImplementedError but all other child
-            # classes will.
-            return
-
-        for attr in ["SUMMARY", "METADATA"]:
-            if getattr(cls, attr) is NotImplemented:
-                raise NotImplementedError(
-                    f"You forgot to define {attr} for {cls.__name__}"
-                )
-        for k, v in asdict(cls.METADATA).items():
-            if v is NotImplemented:
-                raise NotImplementedError(f"You forgot to define METADATA.{k}")
-            if not v:
-                raise NotImplementedError(f"METADATA.{k} should not be None or empty")
-
     def __init__(self, execution_context: CodemodExecutionContext, file_context):
         self.execution_context = execution_context
         self.file_context = file_context
@@ -88,18 +69,9 @@ class SemgrepCodemod(BaseCodemod):
     YAML_FILES: ClassVar[List[str]] = NotImplemented
     is_semgrep = True
 
-    def __init_subclass__(cls, **kwargs):
-        super().__init_subclass__(**kwargs)
-
-        if cls.YAML_FILES is NotImplemented:
-            raise NotImplementedError(
-                "You forgot to define class attribute: YAML_FILES"
-            )
-
-        cls.RULE_IDS = rule_ids_from_yaml_files(cls.YAML_FILES)
-
     def __init__(self, *args):
         super().__init__(*args)
+        self.RULE_IDS = rule_ids_from_yaml_files(self.YAML_FILES)
         self._results = list(
             itertools.chain.from_iterable(
                 map(lambda rId: self.file_context.results_by_id[rId], self.RULE_IDS)
diff --git a/tests/codemods/test_base_codemod.py b/tests/codemods/test_base_codemod.py
index 571019e9..e277d90e 100644
--- a/tests/codemods/test_base_codemod.py
+++ b/tests/codemods/test_base_codemod.py
@@ -2,7 +2,6 @@
 from typing import DefaultDict
 import libcst as cst
 from libcst.codemod import Codemod, CodemodContext
-import pytest
 import mock
 from codemodder.codemods.base_codemod import (
     SemgrepCodemod,
@@ -43,35 +42,3 @@ def run_and_assert(self, input_code, expexted_output):
     def test_empty_results(self):
         input_code = """print('Hello World')"""
         self.run_and_assert(input_code, input_code)
-
-
-class TestSemgrepCodemod:
-    # pylint: disable=unused-variable
-    def test_missing_class_attrs(self):
-        with pytest.raises(NotImplementedError):
-
-            class MissingInfoCodemod(SemgrepCodemod):
-                ...
-
-        with pytest.raises(NotImplementedError):
-
-            class MissingNameCodemod(SemgrepCodemod):
-                METADATA = CodemodMetadata(
-                    "Description", None, ReviewGuidance.MERGE_WITHOUT_REVIEW
-                )
-
-        with pytest.raises(NotImplementedError):
-
-            class MissingDescriptionCodemod(SemgrepCodemod):
-                METADATA = CodemodMetadata(
-                    "", "Name", ReviewGuidance.MERGE_WITHOUT_REVIEW
-                )
-
-        with pytest.raises(NotImplementedError):
-
-            class MissingAuthorCodemod(SemgrepCodemod):
-                METADATA = CodemodMetadata(
-                    NotImplemented,
-                    "Name",
-                    ReviewGuidance.MERGE_WITHOUT_REVIEW,
-                )
diff --git a/tests/codemods/test_django_debug_flag_on.py b/tests/codemods/test_django_debug_flag_on.py
index 20426530..4db6ab22 100644
--- a/tests/codemods/test_django_debug_flag_on.py
+++ b/tests/codemods/test_django_debug_flag_on.py
@@ -5,8 +5,12 @@
 class TestDjangoDebugFlagOn(BaseDjangoCodemodTest):
     codemod = DjangoDebugFlagOn
 
-    def test_rule_ids(self):
-        assert self.codemod.RULE_IDS == ["django-debug-flag-on"]
+    def test_rule_ids(self, mocker):
+        assert self.codemod(
+            mocker.MagicMock(),
+            mocker.MagicMock(),
+            mocker.MagicMock(),
+        ).RULE_IDS == ["django-debug-flag-on"]
 
     def test_settings_dot_py(self, tmpdir):
         django_root, settings_folder = self.create_dir_structure(tmpdir)
diff --git a/tests/codemods/test_django_session_cookie_secure_off.py b/tests/codemods/test_django_session_cookie_secure_off.py
index 327f4457..8e4afac1 100644
--- a/tests/codemods/test_django_session_cookie_secure_off.py
+++ b/tests/codemods/test_django_session_cookie_secure_off.py
@@ -8,8 +8,12 @@
 class TestDjangoSessionSecureCookieOff(BaseDjangoCodemodTest):
     codemod = DjangoSessionCookieSecureOff
 
-    def test_rule_ids(self):
-        assert self.codemod.RULE_IDS == ["found-settings-file"]
+    def test_rule_ids(self, mocker):
+        assert self.codemod(
+            mocker.MagicMock(),
+            mocker.MagicMock(),
+            mocker.MagicMock(),
+        ).RULE_IDS == ["found-settings-file"]
 
     def test_not_settings_dot_py(self, tmpdir):
         django_root, settings_folder = self.create_dir_structure(tmpdir)
diff --git a/tests/codemods/test_url_sandbox.py b/tests/codemods/test_url_sandbox.py
index eafb0fab..379effc9 100644
--- a/tests/codemods/test_url_sandbox.py
+++ b/tests/codemods/test_url_sandbox.py
@@ -6,8 +6,12 @@
 class TestUrlSandbox(BaseSemgrepCodemodTest):
     codemod = UrlSandbox
 
-    def test_rule_ids(self):
-        assert self.codemod.RULE_IDS == ["sandbox-url-creation"]
+    def test_rule_ids(self, mocker):
+        assert self.codemod(
+            mocker.MagicMock(),
+            mocker.MagicMock(),
+            mocker.MagicMock(),
+        ).RULE_IDS == ["sandbox-url-creation"]
 
     def test_import_requests(self, tmpdir):
         input_code = """import requests