diff --git a/tests/conftest.py b/tests/conftest.py
index 4c46ba448..8846ece54 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -9,7 +9,7 @@ from dvc.testing.fixtures import *  # noqa, pylint: disable=wildcard-import
 
 from .dir_helpers import *  # noqa, pylint: disable=wildcard-import
 from .remotes import *  # noqa, pylint: disable=wildcard-import
-from .utils.scriptify import scriptify
+from .scripts import *  # noqa, pylint: disable=wildcard-import
 
 # Prevent updater and analytics from running their processes
 os.environ["DVC_TEST"] = "true"
@@ -172,9 +172,6 @@ def custom_template(tmp_dir, dvc):
     return template
 
 
-scriptify_fixture = pytest.fixture(lambda: scriptify, name="scriptify")
-
-
 @pytest.fixture(autouse=True)
 def mocked_webbrowser_open(mocker):
     mocker.patch("webbrowser.open")
@@ -218,7 +215,7 @@ defaultBranch=master
 
 
 @pytest.fixture
-def run_copy_metrics(tmp_dir, run_copy):
+def run_copy_metrics(tmp_dir, copy_script):
     def run(
         file1,
         file2,
diff --git a/tests/dir_helpers.py b/tests/dir_helpers.py
index b9eb0dce4..b010d29a5 100644
--- a/tests/dir_helpers.py
+++ b/tests/dir_helpers.py
@@ -47,7 +47,6 @@ from global repo template to creating everything inplace, which:
 
 import os
 import pathlib
-from textwrap import dedent
 
 import pytest
 
@@ -67,17 +66,7 @@ disable_other_loggers()
 
 
 @pytest.fixture
-def run_copy(tmp_dir, dvc):
-    tmp_dir.gen(
-        "copy.py",
-        (
-            "import sys, shutil, os\n"
-            "shutil.copyfile(sys.argv[1], sys.argv[2]) "
-            "if os.path.isfile(sys.argv[1]) "
-            "else shutil.copytree(sys.argv[1], sys.argv[2])"
-        ),
-    )
-
+def run_copy(tmp_dir, copy_script, dvc):
     def run_copy(src, dst, **run_kwargs):
         wdir = pathlib.Path(run_kwargs.get("wdir", "."))
         wdir = pathlib.Path("../" * len(wdir.parts))
@@ -94,23 +83,7 @@ def run_copy(tmp_dir, dvc):
 
 
 @pytest.fixture
-def run_head(tmp_dir, dvc):
-    """Output first line of each file to different file with '-1' appended.
-    Useful for tracking multiple outputs/dependencies which are not a copy
-    of each others.
-    """
-    tmp_dir.gen(
-        {
-            "head.py": dedent(
-                """
-        import sys
-        for file in sys.argv[1:]:
-            with open(file) as f, open(file +"-1","w+") as w:
-                w.write(f.readline())
-        """
-            )
-        }
-    )
+def run_head(tmp_dir, head_script, dvc):
     script = os.path.abspath(tmp_dir / "head.py")
 
     def run(*args, **run_kwargs):
diff --git a/tests/func/experiments/test_experiments.py b/tests/func/experiments/test_experiments.py
index 1291e06f8..c0b2665c7 100644
--- a/tests/func/experiments/test_experiments.py
+++ b/tests/func/experiments/test_experiments.py
@@ -13,7 +13,7 @@ from dvc.repo.experiments.utils import exp_refs_by_rev
 from dvc.scm import resolve_rev
 from dvc.stage.exceptions import StageFileDoesNotExistError
 from dvc.utils.serialize import PythonFileCorruptedError
-from tests.func.test_repro_multistage import COPY_SCRIPT
+from tests.scripts import COPY_SCRIPT
 
 
 @pytest.mark.parametrize("name", [None, "foo"])
@@ -209,8 +209,7 @@ def test_get_baseline(tmp_dir, scm, dvc, exp_stage):
     assert dvc.experiments.get_baseline(f"{CELERY_STASH}@{{1}}") == init_rev
 
 
-def test_update_py_params(tmp_dir, scm, dvc, test_queue):
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
+def test_update_py_params(tmp_dir, scm, dvc, test_queue, copy_script):
     tmp_dir.gen("params.py", "INT = 1\n")
     stage = dvc.run(
         cmd="python copy.py params.py metrics.py",
@@ -371,8 +370,7 @@ def test_no_scm(tmp_dir):
             getattr(dvc.experiments, cmd)()
 
 
-def test_untracked(tmp_dir, scm, dvc, caplog, workspace):
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
+def test_untracked(tmp_dir, scm, dvc, caplog, workspace, copy_script):
     tmp_dir.scm_gen("params.yaml", "foo: 1", commit="track params")
     stage = dvc.run(
         cmd="python copy.py params.yaml metrics.yaml",
@@ -600,9 +598,10 @@ def test_fix_exp_head(tmp_dir, scm, tail):
     "params, target",
     itertools.product(("foo: 1", "foo: 2"), (True, False)),
 )
-def test_modified_data_dep(tmp_dir, scm, dvc, workspace, params, target):
+def test_modified_data_dep(
+    tmp_dir, scm, dvc, workspace, params, target, copy_script
+):
     tmp_dir.dvc_gen("data", "data")
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
     tmp_dir.gen("params.yaml", "foo: 1")
     exp_stage = dvc.run(
         cmd="python copy.py params.yaml metrics.yaml",
diff --git a/tests/func/experiments/test_gc.py b/tests/func/experiments/test_gc.py
index e5f9069ca..4837952bb 100644
--- a/tests/func/experiments/test_gc.py
+++ b/tests/func/experiments/test_gc.py
@@ -1,12 +1,9 @@
 import pytest
 from funcy import first
 
-from tests.func.test_repro_multistage import COPY_SCRIPT
-
 
 @pytest.mark.parametrize("queued, expected", [(True, 0), (False, 1)])
-def test_workspace(tmp_dir, scm, dvc, queued, expected):
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
+def test_workspace(tmp_dir, scm, dvc, queued, expected, copy_script):
     tmp_dir.gen("params.yaml", "foo: 1")
 
     stage = dvc.run(
@@ -26,8 +23,7 @@ def test_workspace(tmp_dir, scm, dvc, queued, expected):
 
 
 @pytest.mark.parametrize("queued, expected", [(True, 0), (False, 2)])
-def test_all_commits(tmp_dir, scm, dvc, queued, expected):
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
+def test_all_commits(tmp_dir, scm, dvc, queued, expected, copy_script):
     tmp_dir.gen("params.yaml", "foo: 1")
 
     stage = dvc.run(
@@ -55,8 +51,7 @@ def test_all_commits(tmp_dir, scm, dvc, queued, expected):
 
 
 @pytest.mark.parametrize("queued, expected", [(True, 2), (False, 3)])
-def test_all_branches(tmp_dir, scm, dvc, queued, expected):
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
+def test_all_branches(tmp_dir, scm, dvc, queued, expected, copy_script):
     tmp_dir.gen("params.yaml", "foo: 1")
 
     stage = dvc.run(
@@ -91,8 +86,7 @@ def test_all_branches(tmp_dir, scm, dvc, queued, expected):
 
 
 @pytest.mark.parametrize("queued, expected", [(True, 2), (False, 3)])
-def test_all_tags(tmp_dir, scm, dvc, queued, expected):
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
+def test_all_tags(tmp_dir, scm, dvc, queued, expected, copy_script):
     tmp_dir.gen("params.yaml", "foo: 1")
 
     stage = dvc.run(
diff --git a/tests/func/experiments/test_show.py b/tests/func/experiments/test_show.py
index 2869053fe..59efcdd97 100644
--- a/tests/func/experiments/test_show.py
+++ b/tests/func/experiments/test_show.py
@@ -20,7 +20,6 @@ from dvc.repo.experiments.utils import exp_refs_by_rev
 from dvc.utils import relpath
 from dvc.utils.fs import makedirs
 from dvc.utils.serialize import YAMLFileCorruptedError
-from tests.func.test_repro_multistage import COPY_SCRIPT
 
 LOCK_CONTENTS = {
     "read": {
@@ -313,10 +312,10 @@ def test_show_filter(
     scm,
     dvc,
     capsys,
+    copy_script,
 ):
     capsys.readouterr()
 
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
     params_file = tmp_dir / "params.yaml"
     params_data = {
         "foo": 1,
@@ -679,8 +678,7 @@ def test_show_csv(tmp_dir, scm, dvc, exp_stage, capsys):
     )
 
 
-def test_show_only_changed(tmp_dir, dvc, scm, capsys):
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
+def test_show_only_changed(tmp_dir, dvc, scm, capsys, copy_script):
     params_file = tmp_dir / "params.yaml"
     params_data = {
         "foo": 1,
@@ -726,13 +724,14 @@ def test_show_only_changed(tmp_dir, dvc, scm, capsys):
     assert "metrics.yaml:bar" in cap.out
 
 
-def test_show_parallel_coordinates(tmp_dir, dvc, scm, mocker, capsys):
+def test_show_parallel_coordinates(
+    tmp_dir, dvc, scm, mocker, capsys, copy_script
+):
     from dvc.commands.experiments import show
 
     webbroser_open = mocker.patch("webbrowser.open")
     show_experiments = mocker.spy(show, "show_experiments")
 
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
     params_file = tmp_dir / "params.yaml"
     params_data = {
         "foo": 1,
@@ -807,8 +806,7 @@ def test_show_parallel_coordinates(tmp_dir, dvc, scm, mocker, capsys):
 
 
 @pytest.mark.vscode
-def test_show_outs(tmp_dir, dvc, scm, erepo_dir):
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
+def test_show_outs(tmp_dir, dvc, scm, erepo_dir, copy_script):
     params_file = tmp_dir / "params.yaml"
     params_data = {
         "foo": 1,
@@ -889,8 +887,7 @@ def test_show_outs(tmp_dir, dvc, scm, erepo_dir):
     }
 
 
-def test_metrics_renaming(tmp_dir, dvc, scm, capsys):
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
+def test_metrics_renaming(tmp_dir, dvc, scm, capsys, copy_script):
     params_file = tmp_dir / "params.yaml"
     params_data = {
         "foo": 1,
diff --git a/tests/func/test_import_url.py b/tests/func/test_import_url.py
index 8417f9200..55cdf9f5f 100644
--- a/tests/func/test_import_url.py
+++ b/tests/func/test_import_url.py
@@ -13,37 +13,32 @@ from dvc.exceptions import InvalidArgumentError
 from dvc.stage import Stage
 from dvc.testing.workspace_tests import TestImport as _TestImport
 from dvc.utils.fs import makedirs
-from tests.basic_env import TestDvc
 
 
-class TestCmdImport(TestDvc):
-    def test(self):
-        ret = main(["import-url", self.FOO, "import"])
-        self.assertEqual(ret, 0)
-        self.assertTrue(os.path.exists("import.dvc"))
+def test_cmd_import(tmp_dir, dvc):
+    tmp_dir.gen("foo", "foo")
+    ret = main(["import-url", "foo", "import"])
+    assert ret == 0
+    assert os.path.exists("import.dvc")
 
-        ret = main(["import-url", "non-existing-file", "import"])
-        self.assertNotEqual(ret, 0)
-
-    def test_unsupported(self):
-        ret = main(["import-url", "unsupported://path", "import_unsupported"])
-        self.assertNotEqual(ret, 0)
+    ret = main(["import-url", "non-existing-file", "import"])
+    assert ret != 0
 
 
-class TestDefaultOutput(TestDvc):
-    def test(self):
-        tmpdir = self.mkdtemp()
-        filename = str(uuid4())
-        tmpfile = os.path.join(tmpdir, filename)
+def test_cmd_unsupported_scheme(dvc):
+    ret = main(["import-url", "unsupported://path", "import_unsupported"])
+    assert ret != 0
 
-        with open(tmpfile, "w", encoding="utf-8") as fd:
-            fd.write("content")
 
-        ret = main(["import-url", tmpfile])
-        self.assertEqual(ret, 0)
-        self.assertTrue(os.path.exists(filename))
-        with open(filename, encoding="utf-8") as fd:
-            self.assertEqual(fd.read(), "content")
+def test_default_output(tmp_dir, dvc, cloud):
+    filename = str(uuid4())
+    tmpfile = cloud / filename
+    tmpfile.write_bytes(b"content")
+    cloud.gen(filename, "content")
+
+    ret = main(["import-url", tmpfile.fs_path])
+    assert ret == 0
+    assert (tmp_dir / filename).read_bytes() == b"content"
 
 
 def test_should_remove_outs_before_import(tmp_dir, dvc, mocker, erepo_dir):
@@ -56,26 +51,22 @@ def test_should_remove_outs_before_import(tmp_dir, dvc, mocker, erepo_dir):
     assert remove_outs_call_counter.mock.call_count == 1
 
 
-class TestImportFilename(TestDvc):
-    def setUp(self):
-        super().setUp()
-        tmp_dir = self.mkdtemp()
-        self.external_source = os.path.join(tmp_dir, "file")
-        with open(self.external_source, "w", encoding="utf-8") as fobj:
-            fobj.write("content")
+def test_import_filename(tmp_dir, dvc, cloud):
+    external_source = cloud / "file"
+    (cloud / "file").write_text("content", encoding="utf-8")
+    ret = main(["import-url", "--file", "bar.dvc", external_source.fs_path])
+    assert ret == 0
+    assert (tmp_dir / "bar.dvc").exists()
 
-    def test(self):
-        ret = main(["import-url", "--file", "bar.dvc", self.external_source])
-        self.assertEqual(0, ret)
-        self.assertTrue(os.path.exists("bar.dvc"))
+    (tmp_dir / "bar.dvc").unlink()
+    (tmp_dir / "sub").mkdir()
 
-        os.remove("bar.dvc")
-        os.mkdir("sub")
-
-        path = os.path.join("sub", "bar.dvc")
-        ret = main(["import-url", "--file", path, self.external_source, "out"])
-        self.assertEqual(0, ret)
-        self.assertTrue(os.path.exists(path))
+    path = tmp_dir / "sub" / "bar.dvc"
+    ret = main(
+        ["import-url", "--file", path.fs_path, external_source.fs_path, "out"]
+    )
+    assert ret == 0
+    assert path.exists()
 
 
 @pytest.mark.parametrize("dname", [".", "dir", "dir/subdir"])
diff --git a/tests/func/test_remote.py b/tests/func/test_remote.py
index cd08ec9f3..dce848a26 100644
--- a/tests/func/test_remote.py
+++ b/tests/func/test_remote.py
@@ -10,58 +10,51 @@ from dvc.cli import main
 from dvc.config import Config
 from dvc.exceptions import DownloadError, RemoteCacheRequiredError, UploadError
 from dvc.utils.fs import remove
-from tests.basic_env import TestDvc
 
 
-class TestRemote(TestDvc):
-    def test(self):
-        remotes = ["a", "b", "c"]
+def test_remote(dvc):
+    remotes = ["a", "b", "c"]
 
-        self.assertEqual(main(["remote", "list"]), 0)
-        self.assertNotEqual(main(["remote", "remove", remotes[0]]), 0)
+    assert main(["remote", "list"]) == 0
+    assert main(["remote", "remove", remotes[0]]) != 0
 
-        for r in remotes:
-            self.assertEqual(
-                main(["remote", "add", "--default", r, "s3://bucket/name"]), 0
-            )
+    for r in remotes:
+        assert main(["remote", "add", "--default", r, "s3://bucket/name"]) == 0
 
-        self.assertEqual(main(["remote", "list"]), 0)
+    assert main(["remote", "list"]) == 0
 
-        self.assertEqual(
-            main(["remote", "modify", remotes[0], "checksum_jobs", "1"]), 0
-        )
-        self.assertEqual(main(["remote", "remove", remotes[0]]), 0)
+    assert main(["remote", "modify", remotes[0], "checksum_jobs", "1"]) == 0
+    assert main(["remote", "remove", remotes[0]]) == 0
 
-        self.assertEqual(main(["remote", "list"]), 0)
+    assert main(["remote", "list"]) == 0
 
-    def test_relative_path(self):
-        dname = os.path.join("..", "path", "to", "dir")
-        ret = main(["remote", "add", "mylocal", dname])
-        self.assertEqual(ret, 0)
 
-        # NOTE: we are in the repo's root and config is in .dvc/, so
-        # dir path written to config should be just one level above.
-        rel = os.path.join("..", dname)
-        config = configobj.ConfigObj(self.dvc.config.files["repo"])
-        self.assertEqual(
-            config['remote "mylocal"']["url"], rel.replace("\\", "/")
-        )
+def test_remote_add_relative_path(dvc):
+    dname = os.path.join("..", "path", "to", "dir")
+    ret = main(["remote", "add", "mylocal", dname])
+    assert ret == 0
 
-    def test_overwrite(self):
-        remote_name = "a"
-        remote_url = "s3://bucket/name"
-        self.assertEqual(main(["remote", "add", remote_name, remote_url]), 0)
-        self.assertEqual(main(["remote", "add", remote_name, remote_url]), 251)
-        self.assertEqual(
-            main(["remote", "add", "-f", remote_name, remote_url]), 0
-        )
+    # NOTE: we are in the repo's root and config is in .dvc/, so
+    # dir path written to config should be just one level above.
+    rel = os.path.join("..", dname)
+    config = configobj.ConfigObj(dvc.config.files["repo"])
+    assert config['remote "mylocal"']["url"] == rel.replace("\\", "/")
 
-    def test_referencing_other_remotes(self):
-        assert main(["remote", "add", "foo", "ssh://localhost/"]) == 0
-        assert main(["remote", "add", "bar", "remote://foo/dvc-storage"]) == 0
 
-        config = configobj.ConfigObj(self.dvc.config.files["repo"])
-        assert config['remote "bar"']["url"] == "remote://foo/dvc-storage"
+def test_remote_overwrite(dvc):
+    remote_name = "a"
+    remote_url = "s3://bucket/name"
+    assert main(["remote", "add", remote_name, remote_url]) == 0
+    assert main(["remote", "add", remote_name, remote_url]) == 251
+    assert main(["remote", "add", "-f", remote_name, remote_url]) == 0
+
+
+def test_referencing_other_remotes(dvc):
+    assert main(["remote", "add", "foo", "ssh://localhost/"]) == 0
+    assert main(["remote", "add", "bar", "remote://foo/dvc-storage"]) == 0
+
+    config = configobj.ConfigObj(dvc.config.files["repo"])
+    assert config['remote "bar"']["url"] == "remote://foo/dvc-storage"
 
 
 def test_remove_default(tmp_dir, dvc):
@@ -85,37 +78,35 @@ def test_remove_default(tmp_dir, dvc):
     assert local_config.get("core", {}).get("remote") is None
 
 
-class TestRemoteRemove(TestDvc):
-    def test(self):
-        ret = main(["config", "core.checksum_jobs", "1"])
-        self.assertEqual(ret, 0)
+def test_remote_remove(dvc):
+    ret = main(["config", "core.checksum_jobs", "1"])
+    assert ret == 0
 
-        remote = "mys3"
-        ret = main(["remote", "add", remote, "s3://bucket/name"])
-        self.assertEqual(ret, 0)
+    remote = "mys3"
+    ret = main(["remote", "add", remote, "s3://bucket/name"])
+    assert ret == 0
 
-        ret = main(["remote", "remove", remote])
-        self.assertEqual(ret, 0)
+    ret = main(["remote", "remove", remote])
+    assert ret == 0
 
 
-class TestRemoteDefault(TestDvc):
-    def test(self):
-        remote = "mys3"
-        ret = main(["remote", "add", "mys3", "s3://bucket/path"])
-        self.assertEqual(ret, 0)
+def test_remote_default_cmd(dvc):
+    remote = "mys3"
+    ret = main(["remote", "add", "mys3", "s3://bucket/path"])
+    assert ret == 0
 
-        ret = main(["remote", "default", "mys3"])
-        self.assertEqual(ret, 0)
-        config_file = os.path.join(self.dvc.dvc_dir, Config.CONFIG)
-        config = configobj.ConfigObj(config_file)
-        default = config["core"]["remote"]
-        self.assertEqual(default, remote)
+    ret = main(["remote", "default", "mys3"])
+    assert ret == 0
+    config_file = os.path.join(dvc.dvc_dir, Config.CONFIG)
+    config = configobj.ConfigObj(config_file)
+    default = config["core"]["remote"]
+    assert default == remote
 
-        ret = main(["remote", "default", "--unset"])
-        self.assertEqual(ret, 0)
-        config = configobj.ConfigObj(config_file)
-        default = config.get("core", {}).get("remote")
-        self.assertEqual(default, None)
+    ret = main(["remote", "default", "--unset"])
+    assert ret == 0
+    config = configobj.ConfigObj(config_file)
+    default = config.get("core", {}).get("remote")
+    assert default is None
 
 
 def test_show_default(dvc, capsys):
diff --git a/tests/func/test_repo_index.py b/tests/func/test_repo_index.py
index c419d88fc..66f5c0cf3 100644
--- a/tests/func/test_repo_index.py
+++ b/tests/func/test_repo_index.py
@@ -220,7 +220,7 @@ def test_unique_identifier(tmp_dir, dvc, scm, run_copy):
     # we get "workspace" as well from the brancher by default
     assert len(revs) + 1 == len(ids)
     possible_ids = {
-        True: "2ba7c7c5b395d4211348d6274b869fc7",
+        True: "dd9cf3a3dc2caac5835e64f258ac2d7b",
         False: "8406970ad2fcafaa84d9310330a67576",
     }
     assert set(ids) == {possible_ids[os.name == "posix"]}
diff --git a/tests/func/test_stage.py b/tests/func/test_stage.py
index 73e0699e9..ba0a0ec60 100644
--- a/tests/func/test_stage.py
+++ b/tests/func/test_stage.py
@@ -1,10 +1,8 @@
 import os
-import tempfile
 
 import pytest
 
 from dvc.annotations import Annotation
-from dvc.cli import main
 from dvc.dvcfile import SingleStageFile
 from dvc.fs import LocalFileSystem
 from dvc.output import Output
@@ -15,7 +13,6 @@ from dvc.stage.utils import compute_md5
 from dvc.utils import dict_md5
 from dvc.utils.serialize import dump_yaml, load_yaml
 from dvc.utils.strictyaml import YAMLValidationError
-from tests.basic_env import TestDvc
 
 
 def test_cmd_obj():
@@ -71,90 +68,74 @@ def test_list():
     SingleStageFile.validate(d)
 
 
-class TestReload(TestDvc):
-    def test(self):
-        stages = self.dvc.add(self.FOO)
-        self.assertEqual(len(stages), 1)
-        stage = stages[0]
-        self.assertTrue(stage is not None)
+def test_reload(tmp_dir, dvc):
+    (stage,) = tmp_dir.dvc_gen("foo", "foo")
+    d = load_yaml(stage.relpath)
 
-        d = load_yaml(stage.relpath)
+    # NOTE: checking that reloaded stage didn't change its checksum
+    md5 = "11111111111111111111111111111111"
+    d[stage.PARAM_MD5] = md5
+    dump_yaml(stage.relpath, d)
 
-        # NOTE: checking that reloaded stage didn't change its checksum
-        md5 = "11111111111111111111111111111111"
-        d[stage.PARAM_MD5] = md5
-        dump_yaml(stage.relpath, d)
+    dvcfile = SingleStageFile(dvc, stage.relpath)
+    stage = dvcfile.stage
 
-        dvcfile = SingleStageFile(self.dvc, stage.relpath)
-        stage = dvcfile.stage
+    assert stage is not None
+    dvcfile.dump(stage)
 
-        self.assertTrue(stage is not None)
-        dvcfile.dump(stage)
-
-        d = load_yaml(stage.relpath)
-        self.assertEqual(d[stage.PARAM_MD5], md5)
+    d = load_yaml(stage.relpath)
+    assert d[stage.PARAM_MD5] == md5
 
 
-class TestDefaultWorkingDirectory(TestDvc):
-    def test_ignored_in_checksum(self):
-        stage = self.dvc.run(
-            cmd=f"echo test > {self.FOO}",
-            deps=[self.BAR],
-            outs=[self.FOO],
-            single_stage=True,
-        )
+def test_default_wdir_ignored_in_checksum(tmp_dir, dvc):
+    tmp_dir.gen("bar", "bar")
+    stage = dvc.run(
+        cmd="cp bar foo",
+        deps=["bar"],
+        outs=["foo"],
+        single_stage=True,
+    )
 
-        d = stage.dumpd()
-        self.assertNotIn(Stage.PARAM_WDIR, d.keys())
+    d = stage.dumpd()
+    assert Stage.PARAM_WDIR not in d.keys()
 
-        d = load_yaml(stage.relpath)
-        self.assertNotIn(Stage.PARAM_WDIR, d.keys())
+    d = load_yaml(stage.relpath)
+    assert Stage.PARAM_WDIR not in d.keys()
 
-        with self.dvc.lock:
-            stage = SingleStageFile(self.dvc, stage.relpath).stage
-            self.assertFalse(stage.changed())
+    with dvc.lock:
+        stage = SingleStageFile(dvc, stage.relpath).stage
+        assert not stage.changed()
 
 
-class TestExternalRemoteResolution(TestDvc):
-    def test_remote_output(self):
-        tmp_path = tempfile.mkdtemp()
-        storage = os.path.join(tmp_path, "storage")
-        file_path = os.path.join(storage, "file")
+def test_external_remote_output_resolution(tmp_dir, dvc, make_remote):
+    tmp_path = make_remote("tmp", default=False)
+    tmp_dir.add_remote(
+        url="remote://tmp/storage", name="storage", default=False
+    )
+    storage = tmp_path / "storage"
+    storage.mkdir()
+    file_path = storage / "file"
 
-        os.makedirs(storage)
+    dvc.run(
+        cmd=f"echo file > {file_path}",
+        outs_no_cache=["remote://storage/file"],
+        single_stage=True,
+    )
+    assert os.path.exists(file_path)
 
-        assert main(["remote", "add", "tmp", tmp_path]) == 0
-        assert main(["remote", "add", "storage", "remote://tmp/storage"]) == 0
-        assert (
-            main(
-                [
-                    "run",
-                    "--single-stage",
-                    "-O",
-                    "remote://storage/file",
-                    f"echo file > {file_path}",
-                ]
-            )
-            == 0
-        )
 
-        assert os.path.exists(file_path)
+def test_external_remote_dependency_resolution(tmp_dir, dvc, make_remote):
+    tmp_path = make_remote("tmp", default=False)
+    tmp_dir.add_remote(
+        url="remote://tmp/storage", name="storage", default=False
+    )
+    storage = tmp_path / "storage"
+    storage.mkdir()
+    file_path = storage / "file"
+    file_path.write_text("Isle of Dogs", encoding="utf-8")
 
-    def test_remote_dependency(self):
-        tmp_path = tempfile.mkdtemp()
-        storage = os.path.join(tmp_path, "storage")
-        file_path = os.path.join(storage, "file")
-
-        os.makedirs(storage)
-
-        with open(file_path, "w", encoding="utf-8") as fobj:
-            fobj.write("Isle of Dogs")
-
-        assert main(["remote", "add", "tmp", tmp_path]) == 0
-        assert main(["remote", "add", "storage", "remote://tmp/storage"]) == 0
-        assert main(["import-url", "remote://storage/file", "movie.txt"]) == 0
-
-        assert os.path.exists("movie.txt")
+    dvc.imp_url("remote://storage/file", "movie.txt")
+    assert (tmp_dir / "movie.txt").read_text() == "Isle of Dogs"
 
 
 def test_md5_ignores_comments(tmp_dir, dvc):
diff --git a/tests/scripts.py b/tests/scripts.py
new file mode 100644
index 000000000..5d8e4242c
--- /dev/null
+++ b/tests/scripts.py
@@ -0,0 +1,59 @@
+import pytest
+
+COPY_SCRIPT = """
+import os
+import shutil
+import sys
+
+if os.path.isfile(sys.argv[1]):
+    shutil.copyfile(sys.argv[1], sys.argv[2])
+else:
+    shutil.copytree(sys.argv[1], sys.argv[2])
+"""
+
+
+def _add_script(tmp_dir, path, contents=""):
+    script, *_ = tmp_dir.gen(path, contents)
+    if hasattr(tmp_dir, "scm"):
+        tmp_dir.scm_add(path, commit=f"add {path}")
+    return script.fs_path
+
+
+@pytest.fixture
+def append_foo_script(tmp_dir):
+    return _add_script(
+        tmp_dir,
+        "append_foo.py",
+        """
+import sys
+from pathlib import Path
+
+with Path(sys.argv[1]).open("a+", encoding="utf-8") as f:
+    f.write("foo")
+""",
+    )
+
+
+@pytest.fixture
+def copy_script(
+    tmp_dir,
+):
+    return _add_script(tmp_dir, "copy.py", COPY_SCRIPT)
+
+
+@pytest.fixture
+def head_script(tmp_dir):
+    """Output first line of each file to different file with '-1' appended.
+    Useful for tracking multiple outputs/dependencies which are not a copy
+    of each others.
+    """
+    return _add_script(
+        tmp_dir,
+        "head.py",
+        """
+import sys
+for file in sys.argv[1:]:
+    with open(file) as f, open(file +"-1","w+") as w:
+        w.write(f.readline())
+""",
+    )
diff --git a/tests/unit/command/test_diff.py b/tests/unit/command/test_diff.py
index c1c44c0c1..4dd6a1aad 100644
--- a/tests/unit/command/test_diff.py
+++ b/tests/unit/command/test_diff.py
@@ -39,7 +39,7 @@ def test_default(mocker, capsys):
     }
     mocker.patch("dvc.repo.Repo.diff", return_value=diff)
 
-    assert 0 == cmd.run()
+    assert cmd.run() == 0
     assert (
         "Added:\n"
         "    file\n"
@@ -77,7 +77,7 @@ def test_show_hash(mocker, capsys):
         "not in cache": [],
     }
     mocker.patch("dvc.repo.Repo.diff", return_value=diff)
-    assert 0 == cmd.run()
+    assert cmd.run() == 0
 
     out, _ = capsys.readouterr()
     assert (
@@ -115,7 +115,7 @@ def test_show_json(mocker, capsys):
     }
     mocker.patch("dvc.repo.Repo.diff", return_value=diff)
 
-    assert 0 == cmd.run()
+    assert cmd.run() == 0
     out, _ = capsys.readouterr()
     assert '"added": [{"path": "file1"}, {"path": "file2"}]' in out
     assert '"deleted": []' in out
@@ -145,7 +145,7 @@ def test_show_json_and_hash(mocker, capsys):
     }
     mocker.patch("dvc.repo.Repo.diff", return_value=diff)
 
-    assert 0 == cmd.run()
+    assert cmd.run() == 0
     out, _ = capsys.readouterr()
     assert (
         '"added": [{"path": "file1", "hash": "11111111"}, '
@@ -180,7 +180,7 @@ def test_show_json_hide_missing(mocker, capsys):
     }
     mocker.patch("dvc.repo.Repo.diff", return_value=diff)
 
-    assert 0 == cmd.run()
+    assert cmd.run() == 0
     out, _ = capsys.readouterr()
     assert '"added": [{"path": "file1"}, {"path": "file2"}]' in out
     assert '"deleted": []' in out
@@ -200,7 +200,7 @@ def test_diff_show_markdown_and_hash(mocker, show_hash):
     mock_show_markdown = mocker.patch("dvc.commands.diff._show_markdown")
     mocker.patch("dvc.repo.Repo.diff", return_value=diff.copy())
 
-    assert 0 == cmd.run()
+    assert cmd.run() == 0
     mock_show_markdown.assert_called_once_with(diff, show_hash, False)
 
 
@@ -226,7 +226,7 @@ def test_no_changes(mocker, capsys, opts, show, expected):
     cmd = args.func(args)
     mocker.patch("dvc.repo.Repo.diff", return_value={})
 
-    assert 0 == cmd.run()
+    assert cmd.run() == 0
     out, _ = capsys.readouterr()
     assert expected == out.strip()
 
@@ -349,7 +349,7 @@ def test_hide_missing(mocker, capsys):
     }
     mocker.patch("dvc.repo.Repo.diff", return_value=diff)
 
-    assert 0 == cmd.run()
+    assert cmd.run() == 0
     out, _ = capsys.readouterr()
     assert (
         "Added:\n"
diff --git a/tests/unit/repo/experiments/conftest.py b/tests/unit/repo/experiments/conftest.py
index a4968ca7d..3c5c43f6d 100644
--- a/tests/unit/repo/experiments/conftest.py
+++ b/tests/unit/repo/experiments/conftest.py
@@ -4,7 +4,6 @@ from textwrap import dedent
 import pytest
 
 from dvc.repo.experiments.queue.celery import LocalCeleryQueue
-from tests.func.test_repro_multistage import COPY_SCRIPT
 
 DEFAULT_ITERATIONS = 2
 CHECKPOINT_SCRIPT_FORMAT = dedent(
@@ -44,8 +43,7 @@ CHECKPOINT_SCRIPT = CHECKPOINT_SCRIPT_FORMAT.format(
 
 
 @pytest.fixture
-def exp_stage(tmp_dir, scm, dvc):
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
+def exp_stage(tmp_dir, scm, dvc, copy_script):
     tmp_dir.gen("params.yaml", "foo: 1")
     stage = dvc.run(
         cmd="python copy.py params.yaml metrics.yaml",
@@ -93,8 +91,7 @@ def checkpoint_stage(tmp_dir, scm, dvc, mocker):
 
 
 @pytest.fixture
-def failed_exp_stage(tmp_dir, scm, dvc):
-    tmp_dir.gen("copy.py", COPY_SCRIPT)
+def failed_exp_stage(tmp_dir, scm, dvc, copy_script):
     tmp_dir.gen("params.yaml", "foo: 1")
     stage = dvc.stage.add(
         cmd="python -c 'import sys; sys.exit(1)'",
diff --git a/tests/unit/stage/test_cache.py b/tests/unit/stage/test_cache.py
index a08d073f6..31c448609 100644
--- a/tests/unit/stage/test_cache.py
+++ b/tests/unit/stage/test_cache.py
@@ -180,14 +180,14 @@ def test_shared_stage_cache(tmp_dir, dvc, run_copy):
 
     run_copy("foo", "bar", name="copy-foo-bar")
 
-    parent_cache_dir = os.path.join(dvc.stage_cache.cache_dir, "88")
+    parent_cache_dir = os.path.join(dvc.stage_cache.cache_dir, "fd")
     cache_dir = os.path.join(
         parent_cache_dir,
-        "883395068439203a9de3d1e1649a16e9027bfd1ab5dab4f438d321c4a928b328",
+        "fdbe7847136ebe88f59a29ee5a568f893cab031f74f7d3ab050828b53fd0033a",
     )
     cache_file = os.path.join(
         cache_dir,
-        "e42b7ebb9bc5ac4bccab769c8d1338914dad25d7ffecc8671dbd4581bad4aa15",
+        "8716052b2074f5acf1a379529d47d6ef1c1f50c2281a7489b8d7ce251f234f86",
     )
 
     # sanity check
diff --git a/tests/utils/scriptify.py b/tests/utils/scriptify.py
deleted file mode 100644
index ee2d73f1d..000000000
--- a/tests/utils/scriptify.py
+++ /dev/null
@@ -1,36 +0,0 @@
-import inspect
-import sys
-import textwrap
-from pathlib import Path
-
-SCRIPT_TEMPLATE = """\
-#! {executable}
-# AUTOGENERATED USING SCRIPTIFY FOR USE IN TESTS FOR DVC
-
-
-{code}
-
-
-if __name__ == "__main__":
-    import sys
-
-    _, *argv = sys.argv
-    func = {func!s}
-    func(*argv)
-"""
-
-
-def scriptify(func, path=None):
-    # you can use `breakpoint()` inside functions too
-    # just remember to run the test in `-s` mode.
-    code = textwrap.dedent(inspect.getsource(func))
-    executable = sys.executable
-    source = SCRIPT_TEMPLATE.format(
-        executable=executable, code=code, func=func.__name__
-    )
-
-    if not path:
-        return source, None
-
-    Path(path).write_text(source, encoding="utf-8")
-    return source, f"{executable} {path}"