test: rename dvc.testing.test_*.py so pytest doesn't handle them as test files

tests/func/api/test_data.py

@@ -9,7 +9,9 @@ from dvc.exceptions import (
     OutputNotFoundError,
     PathMissingError,
 )
-from dvc.testing.test_api import TestAPI  # noqa, pylint: disable=unused-import
+from dvc.testing.api_tests import (  # noqa, pylint: disable=unused-import
+    TestAPI,
+)
 from dvc.testing.tmp_dir import make_subrepo
 from dvc.utils.fs import remove
 

tests/func/test_add.py

@@ -34,7 +34,7 @@ from dvc.stage.exceptions import (
     StageExternalOutputsError,
     StagePathNotFoundError,
 )
-from dvc.testing.test_workspace import TestAdd
+from dvc.testing.workspace_tests import TestAdd
 from dvc.utils import LARGE_DIR_SIZE, relpath
 from dvc.utils.fs import path_isin
 from dvc.utils.serialize import YAMLFileCorruptedError, load_yaml

tests/func/test_data_cloud.py

@@ -9,7 +9,7 @@ import dvc_data
 from dvc.cli import main
 from dvc.external_repo import clean_repos
 from dvc.stage.exceptions import StageNotFound
-from dvc.testing.test_remote import (  # noqa, pylint: disable=unused-import
+from dvc.testing.remote_tests import (  # noqa, pylint: disable=unused-import
     TestRemote,
 )
 from dvc.utils.fs import remove

tests/func/test_import_url.py

@@ -10,7 +10,7 @@ from dvc.cli import main
 from dvc.dependency.base import Dependency, DependencyDoesNotExistError
 from dvc.exceptions import InvalidArgumentError
 from dvc.stage import Stage
-from dvc.testing.test_workspace import TestImport as _TestImport
+from dvc.testing.workspace_tests import TestImport as _TestImport
 from dvc.utils.fs import makedirs
 from tests.basic_env import TestDvc