diff --git a/dev/breeze/src/airflow_breeze/utils/selective_checks.py b/dev/breeze/src/airflow_breeze/utils/selective_checks.py
index dba600090288..2cf57200a45e 100644
--- a/dev/breeze/src/airflow_breeze/utils/selective_checks.py
+++ b/dev/breeze/src/airflow_breeze/utils/selective_checks.py
@@ -223,33 +223,42 @@ def __hash__(self):
     }
 )
 
+PYTHON_OPERATOR_FILES = [
+    r"^airflow/operators/python.py",
+    r"^tests/operators/test_python.py",
+]
+
 TEST_TYPE_MATCHES = HashableDict(
     {
         SelectiveUnitTestTypes.API: [
-            r"^airflow/api",
-            r"^airflow/api_connexion",
-            r"^tests/api",
-            r"^tests/api_connexion",
+            r"^airflow/api/",
+            r"^airflow/api_connexion/",
+            r"^airflow/api_internal/",
+            r"^tests/api/",
+            r"^tests/api_connexion/",
+            r"^tests/api_internal/",
         ],
         SelectiveUnitTestTypes.CLI: [
-            r"^airflow/cli",
-            r"^tests/cli",
+            r"^airflow/cli/",
+            r"^tests/cli/",
         ],
         SelectiveUnitTestTypes.OPERATORS: [
-            r"^airflow/operators",
-            r"^tests/operators",
+            r"^airflow/operators/",
+            r"^tests/operators/",
         ],
         SelectiveUnitTestTypes.PROVIDERS: [
             r"^airflow/providers/",
             r"^tests/system/providers/",
             r"^tests/providers/",
         ],
-        SelectiveUnitTestTypes.PYTHON_VENV: [
-            r"^tests/operators/test_python.py",
-        ],
-        SelectiveUnitTestTypes.BRANCH_PYTHON_VENV: [
-            r"^tests/operators/test_python.py",
+        SelectiveUnitTestTypes.SERIALIZATION: [
+            r"^airflow/serialization/",
+            r"^tests/serialization/",
         ],
+        SelectiveUnitTestTypes.PYTHON_VENV: PYTHON_OPERATOR_FILES,
+        SelectiveUnitTestTypes.BRANCH_PYTHON_VENV: PYTHON_OPERATOR_FILES,
+        SelectiveUnitTestTypes.EXTERNAL_PYTHON: PYTHON_OPERATOR_FILES,
+        SelectiveUnitTestTypes.EXTERNAL_BRANCH_PYTHON: PYTHON_OPERATOR_FILES,
         SelectiveUnitTestTypes.WWW: [r"^airflow/www", r"^tests/www"],
     }
 )
@@ -652,21 +661,14 @@ def _get_test_types_to_run(self) -> list[str]:
 
         candidate_test_types: set[str] = {"Always"}
         matched_files: set[str] = set()
-        matched_files.update(
-            self._select_test_type_if_matching(candidate_test_types, SelectiveUnitTestTypes.WWW)
-        )
-        matched_files.update(
-            self._select_test_type_if_matching(candidate_test_types, SelectiveUnitTestTypes.PROVIDERS)
-        )
-        matched_files.update(
-            self._select_test_type_if_matching(candidate_test_types, SelectiveUnitTestTypes.CLI)
-        )
-        matched_files.update(
-            self._select_test_type_if_matching(candidate_test_types, SelectiveUnitTestTypes.OPERATORS)
-        )
-        matched_files.update(
-            self._select_test_type_if_matching(candidate_test_types, SelectiveUnitTestTypes.API)
-        )
+        for test_type in SelectiveUnitTestTypes:
+            if test_type not in [
+                SelectiveUnitTestTypes.ALWAYS,
+                SelectiveUnitTestTypes.CORE,
+                SelectiveUnitTestTypes.OTHER,
+                SelectiveUnitTestTypes.PLAIN_ASSERTS,
+            ]:
+                matched_files.update(self._select_test_type_if_matching(candidate_test_types, test_type))
 
         kubernetes_files = self._matching_files(
             FileGroupForCi.KUBERNETES_FILES, CI_FILE_GROUP_MATCHES, CI_FILE_GROUP_EXCLUDES
diff --git a/dev/breeze/tests/test_selective_checks.py b/dev/breeze/tests/test_selective_checks.py
index 6198cc59cd24..495c98fd877a 100644
--- a/dev/breeze/tests/test_selective_checks.py
+++ b/dev/breeze/tests/test_selective_checks.py
@@ -161,6 +161,53 @@ def assert_outputs_are_printed(expected_outputs: dict[str, str], stderr: str):
                 id="Only Operator tests and DOCS should run",
             )
         ),
+        (
+            pytest.param(
+                ("airflow/operators/python.py",),
+                {
+                    "affected-providers-list-as-string": None,
+                    "all-python-versions": "['3.8']",
+                    "all-python-versions-list-as-string": "3.8",
+                    "python-versions": "['3.8']",
+                    "python-versions-list-as-string": "3.8",
+                    "ci-image-build": "true",
+                    "prod-image-build": "false",
+                    "needs-helm-tests": "false",
+                    "run-tests": "true",
+                    "run-amazon-tests": "false",
+                    "docs-build": "true",
+                    "skip-pre-commits": "check-provider-yaml-valid,identity,lint-helm-chart,mypy-dev,"
+                    "mypy-docs,mypy-providers,ts-compile-format-lint-www",
+                    "upgrade-to-newer-dependencies": "false",
+                    "parallel-test-types-list-as-string": "Always BranchExternalPython BranchPythonVenv "
+                    "ExternalPython Operators PythonVenv",
+                },
+                id="Only Python tests",
+            )
+        ),
+        (
+            pytest.param(
+                ("airflow/serialization/python.py",),
+                {
+                    "affected-providers-list-as-string": None,
+                    "all-python-versions": "['3.8']",
+                    "all-python-versions-list-as-string": "3.8",
+                    "python-versions": "['3.8']",
+                    "python-versions-list-as-string": "3.8",
+                    "ci-image-build": "true",
+                    "prod-image-build": "false",
+                    "needs-helm-tests": "false",
+                    "run-tests": "true",
+                    "run-amazon-tests": "false",
+                    "docs-build": "true",
+                    "skip-pre-commits": "check-provider-yaml-valid,identity,lint-helm-chart,mypy-dev,"
+                    "mypy-docs,mypy-providers,ts-compile-format-lint-www",
+                    "upgrade-to-newer-dependencies": "false",
+                    "parallel-test-types-list-as-string": "Always Serialization",
+                },
+                id="Only Serialization tests",
+            )
+        ),
         (
             pytest.param(
                 (