diff --git a/.github/workflows/matrix-tests.yml b/.github/workflows/matrix-tests.yml
index cdd982c0..a0747040 100644
--- a/.github/workflows/matrix-tests.yml
+++ b/.github/workflows/matrix-tests.yml
@@ -29,4 +29,4 @@ jobs:
         run: |
           pip install -e .[all]
       - name: Run tests
-        run: cd tests && python run.py prod
+        run: python run_tests.py prod
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index cbab18bf..d79bd6c9 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -32,13 +32,12 @@ jobs:
 
       - name: Run tests
         run: |
-          cd tests
-          coverage run --parallel-mode run.py prod
-          DEVELOPMENT=1 coverage run --parallel-mode test_web_api.py
+          coverage run --parallel-mode run_tests.py prod
+          DEVELOPMENT=1 coverage run --parallel-mode -m tests.test_web_api
           coverage combine
           coverage xml
 
-      - run: cd tests && coverage report
+      - run: coverage report
 
       - name: Make sure pre-commit hooks pass
         uses: pre-commit/action@v3.0.1
@@ -109,7 +108,7 @@ jobs:
           pip install -e .[all]
 
       - name: Run tests on Windows
-        run: cd tests && python run.py prod
+        run: python run_tests.py prod
 
       - name: Make sure the CLI outputs utf8 on Windows
         # Note: we're checking something CLI specific, from a prompt, so we don't want to run
@@ -156,4 +155,4 @@ jobs:
         run: pip install httpx
 
       - name: unit test the web API
-        run: python tests/test_web_api.py
+        run: python -m tests.test_web_api
diff --git a/.gitignore b/.gitignore
index cb3111ba..14024c79 100644
--- a/.gitignore
+++ b/.gitignore
@@ -100,6 +100,7 @@ coverage.xml
 *,cover
 .hypothesis/
 .pytest_cache/
+*tmpdir*
 
 # Translations
 *.mo
diff --git a/README.md b/README.md
index 1283f836..a717b40a 100644
--- a/README.md
+++ b/README.md
@@ -132,25 +132,35 @@ To install the latest published version on PyPI:
 
     pip install readalongs
 
-To install the current development version, clone the repo and pip install it
-locally:
+To install the current development version, clone the repo and pip
+install it locally, either with [hatch](https://hatch.pypa.io) (this
+will open a new shell with the package installed inside it):
 
-```sh
-$ git clone https://github.com/ReadAlongs/Studio.git
-$ cd Studio
-$ pip install -e .
-```
+    git clone https://github.com/ReadAlongs/Studio.git
+    cd Studio
+    hatch shell
+
+or directly with `pip` (you should be using a [virtual
+environment](https://docs.python.org/3/library/venv.html) though!):
+
+    git clone https://github.com/ReadAlongs/Studio.git
+    cd Studio
+    pip install -e .
 
 ### Verifying your installation
 
 Run `readalongs -h` to confirm that installation was successful.
 
 If you installed the current development version with Git, you can also run the
-full test suite (requires installing the dev dependencies):
+full test suite, either with `hatch`:
+
+    hatch test
+
+or test the installed version (requires installing dev dependencies):
 
     pip install 'readalongs[dev]'  # if you installed from PyPI, or
     pip install -e '.[dev]'        # if you installed from a local clone
-    python tests/run.py dev
+    python run_tests.py dev
 
 And you can download our [open samples on GitHub](https://github.com/ReadAlongs/OpenSamples)
 to run your first alignments.
diff --git a/pyproject.toml b/pyproject.toml
index 426d8316..1237f21a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -113,6 +113,9 @@ include = [
 [tool.hatch.env]
 requires = [ "hatch-pip-compile" ]
 
+[tool.hatch.envs.hatch-test]
+features = [ "dev" ]
+
 [tool.hatch.envs.prod]
 features = [ "heroku" ]
 type = "pip-compile"
@@ -132,3 +135,8 @@ ignore_missing_imports = true
 
 [tool.isort]
 profile = "black"
+
+[tool.pytest]
+filterwarnings = [
+    "ignore:'audioop' is deprecated and slated for removal in Python 3.13:DeprecationWarning",
+]
diff --git a/tests/run.py b/run_tests.py
similarity index 81%
rename from tests/run.py
rename to run_tests.py
index 701fb668..37b021a9 100755
--- a/tests/run.py
+++ b/run_tests.py
@@ -19,27 +19,26 @@
 import sys
 from unittest import TestLoader, TestSuite, TextTestRunner
 
-from test_align_cli import TestAlignCli
-from test_anchors import TestAnchors
-from test_api import TestAlignApi
-from test_audio import TestAudio
-from test_config import TestConfig
-from test_dna_text import TestDNAText
-from test_dna_utils import TestDNAUtils
-from test_dtd import TestDTD
-from test_force_align import TestForceAlignment, TestXHTML
-from test_g2p_cli import TestG2pCli
-from test_make_xml_cli import TestMakeXMLCli
-from test_misc import TestMisc
-from test_package_urls import TestPackageURLs
-from test_silence import TestSilence
-from test_smil import TestSmilUtilities
-from test_temp_file import TestTempFile
-from test_tokenize_cli import TestTokenizeCli
-from test_tokenize_xml import TestTokenizer
-from test_web_api import TestWebApi
-
 from readalongs.log import LOGGER
+from tests.test_align_cli import TestAlignCli
+from tests.test_anchors import TestAnchors
+from tests.test_api import TestAlignApi
+from tests.test_audio import TestAudio
+from tests.test_config import TestConfig
+from tests.test_dna_text import TestDNAText
+from tests.test_dna_utils import TestDNAUtils
+from tests.test_dtd import TestDTD
+from tests.test_force_align import TestForceAlignment, TestXHTML
+from tests.test_g2p_cli import TestG2pCli
+from tests.test_make_xml_cli import TestMakeXMLCli
+from tests.test_misc import TestMisc
+from tests.test_package_urls import TestPackageURLs
+from tests.test_silence import TestSilence
+from tests.test_smil import TestSmilUtilities
+from tests.test_temp_file import TestTempFile
+from tests.test_tokenize_cli import TestTokenizeCli
+from tests.test_tokenize_xml import TestTokenizer
+from tests.test_web_api import TestWebApi
 
 LOADER = TestLoader()
 
diff --git a/tests/test_align_cli.py b/tests/test_align_cli.py
index 349b25bd..836dce69 100755
--- a/tests/test_align_cli.py
+++ b/tests/test_align_cli.py
@@ -9,21 +9,22 @@
 import tempfile
 from os.path import exists, join
 from pathlib import Path
+from typing import Union
 from unittest import main
 
-from basic_test_case import BasicTestCase
 from lxml.html import fromstring
-from sound_swallower_stub import SoundSwallowerStub
 
 from readalongs._version import READALONG_FILE_FORMAT_VERSION, VERSION
 from readalongs.cli import align, langs
+from tests.basic_test_case import BasicTestCase
+from tests.sound_swallower_stub import SoundSwallowerStub
 
 
-def write_file(filename: str, file_contents: str) -> str:
+def write_file(filename: Union[str, Path], file_contents: str) -> str:
     """Write file_contents to file filename, and return its name (filename)"""
     with open(filename, mode="w", encoding="utf8") as f:
         f.write(file_contents)
-    return filename
+    return str(filename)
 
 
 class TestAlignCli(BasicTestCase):
@@ -245,7 +246,7 @@ def test_align_english(self):
         """Validates that the lexicon-based g2p works for English language alignment"""
 
         input_filename = write_file(
-            join(self.tempdir, "input"),
+            self.tempdir / "input",
             "This is some text that we will run through the English lexicon "
             "grapheme to morpheme approach.",
         )
@@ -405,7 +406,7 @@ def test_infer_plain_text_or_xml(self):
         """align -i is obsolete, now we infer plain text vs XML; test that!"""
 
         # plain text with guess by contents
-        infile1 = write_file(join(self.tempdir, "infile1"), "some plain text")
+        infile1 = write_file(self.tempdir / "infile1", "some plain text")
         with SoundSwallowerStub("word:0:1"):
             results = self.runner.invoke(
                 align,
@@ -420,7 +421,7 @@ def test_infer_plain_text_or_xml(self):
         self.assertIn("No input language specified for plain text", results.output)
 
         # plain text by extension
-        infile2 = write_file(join(self.tempdir, "infile2.txt"), "<?xml but .txt")
+        infile2 = write_file(self.tempdir / "infile2.txt", "<?xml but .txt")
         with SoundSwallowerStub("word:0:1"):
             results = self.runner.invoke(
                 align,
@@ -437,7 +438,7 @@ def test_infer_plain_text_or_xml(self):
         # XML with guess by contents
         infile3 = self.add_bom(
             write_file(
-                join(self.tempdir, "infile3"),
+                self.tempdir / "infile3",
                 "<?xml version='1.0' encoding='utf-8'?><text>blah blah</text>",
             )
         )
@@ -454,7 +455,7 @@ def test_infer_plain_text_or_xml(self):
 
         # XML with guess by contents, but with content error
         infile4 = write_file(
-            join(self.tempdir, "infile4"),
+            self.tempdir / "infile4",
             "<?xml version='1.0' encoding='utf-8'?><text>blah blah</bad_tag>",
         )
         with SoundSwallowerStub("word:0:1"):
@@ -470,7 +471,7 @@ def test_infer_plain_text_or_xml(self):
         self.assertIn("Error parsing XML", results.output)
 
         # XML by file extension
-        infile5 = write_file(join(self.tempdir, "infile5.readalong"), "Not XML!")
+        infile5 = write_file(self.tempdir / "infile5.readalong", "Not XML!")
         with SoundSwallowerStub("word:0:1"):
             results = self.runner.invoke(
                 align,
diff --git a/tests/test_anchors.py b/tests/test_anchors.py
index be7045c4..843b7449 100755
--- a/tests/test_anchors.py
+++ b/tests/test_anchors.py
@@ -7,10 +7,9 @@
 from io import StringIO
 from unittest import main
 
-from basic_test_case import BasicTestCase, silence_c_stderr
-
 from readalongs.align import align_audio
 from readalongs.log import LOGGER
+from tests.basic_test_case import BasicTestCase, silence_c_stderr
 
 
 class TestAnchors(BasicTestCase):
diff --git a/tests/test_api.py b/tests/test_api.py
index 18353367..52dc96a3 100755
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -4,18 +4,17 @@
 Test suite for the API way to call align
 """
 
-import os
 import re
 from contextlib import redirect_stderr
 from io import StringIO
 from unittest import main
 
 import click
-from basic_test_case import BasicTestCase, silence_logs
-from sound_swallower_stub import SoundSwallowerStub
 
 from readalongs import api
 from readalongs.log import LOGGER
+from tests.basic_test_case import BasicTestCase, silence_logs
+from tests.sound_swallower_stub import SoundSwallowerStub
 
 
 class TestAlignApi(BasicTestCase):
@@ -94,7 +93,7 @@ def test_call_make_xml(self):
 
     def test_deprecated_prepare(self):
         with self.assertLogs(LOGGER, level="WARNING") as cm:
-            api.prepare(self.data_dir / "ej-fra.txt", os.devnull, ("fra",))
+            api.prepare(self.data_dir / "ej-fra.txt", self.tempdir / "foo", ("fra",))
         self.assertIn("deprecated", "\n".join(cm.output))
 
     sentences_to_convert = [
diff --git a/tests/test_audio.py b/tests/test_audio.py
index 5ab69359..307387a2 100755
--- a/tests/test_audio.py
+++ b/tests/test_audio.py
@@ -7,8 +7,6 @@
 from subprocess import run
 from unittest import main
 
-from basic_test_case import BasicTestCase
-
 from readalongs.audio_utils import (
     extract_section,
     join_section,
@@ -18,6 +16,7 @@
     write_audio_to_file,
 )
 from readalongs.log import LOGGER
+from tests.basic_test_case import BasicTestCase
 
 
 class TestAudio(BasicTestCase):
diff --git a/tests/test_dna_text.py b/tests/test_dna_text.py
index e91b64b0..93253900 100755
--- a/tests/test_dna_text.py
+++ b/tests/test_dna_text.py
@@ -6,12 +6,12 @@
 from io import StringIO
 from unittest import main
 
-from basic_test_case import BasicTestCase
 from lxml import etree
 
 from readalongs.text import tokenize_xml
 from readalongs.text.add_ids_to_xml import add_ids
 from readalongs.text.util import parse_xml
+from tests.basic_test_case import BasicTestCase
 
 
 class TestDNAText(BasicTestCase):
diff --git a/tests/test_force_align.py b/tests/test_force_align.py
index 37b0cb2c..d22d623a 100755
--- a/tests/test_force_align.py
+++ b/tests/test_force_align.py
@@ -12,7 +12,6 @@
 from io import StringIO
 from tempfile import TemporaryDirectory
 
-from basic_test_case import BasicTestCase, silence_c_stderr
 from lxml import etree
 from soundswallower import get_model_path
 
@@ -25,6 +24,7 @@
 from readalongs.log import LOGGER
 from readalongs.portable_tempfile import PortableNamedTemporaryFile
 from readalongs.text.util import load_txt, load_xml, save_xml
+from tests.basic_test_case import BasicTestCase, silence_c_stderr
 
 
 class TestForceAlignment(BasicTestCase):
diff --git a/tests/test_g2p_cli.py b/tests/test_g2p_cli.py
index bf9d800e..544d1da2 100755
--- a/tests/test_g2p_cli.py
+++ b/tests/test_g2p_cli.py
@@ -8,16 +8,16 @@
 from io import StringIO
 from unittest import main
 
-from basic_test_case import BasicTestCase
 from lxml import etree
-from sound_swallower_stub import SoundSwallowerStub
-from test_make_xml_cli import updateFormatVersion, updateStudioVersion
 
 from readalongs.align import align_audio
 from readalongs.cli import align, g2p, make_xml, tokenize
 from readalongs.log import LOGGER
 from readalongs.text.convert_xml import convert_xml
 from readalongs.text.util import parse_xml
+from tests.basic_test_case import BasicTestCase
+from tests.sound_swallower_stub import SoundSwallowerStub
+from tests.test_make_xml_cli import updateFormatVersion, updateStudioVersion
 
 
 def run_convert_xml(input_string):
diff --git a/tests/test_make_xml_cli.py b/tests/test_make_xml_cli.py
index c14df446..1c4c0fa9 100755
--- a/tests/test_make_xml_cli.py
+++ b/tests/test_make_xml_cli.py
@@ -8,12 +8,11 @@
 from shutil import copyfile
 from unittest import main
 
-from basic_test_case import BasicTestCase
-
 # from readalongs.log import LOGGER
 from readalongs._version import READALONG_FILE_FORMAT_VERSION, VERSION
 from readalongs.align_utils import create_input_ras, create_ras_from_text
 from readalongs.cli import align, make_xml
+from tests.basic_test_case import BasicTestCase
 
 
 def updateFormatVersion(input):
diff --git a/tests/test_misc.py b/tests/test_misc.py
index 85df66d6..0aa342a0 100755
--- a/tests/test_misc.py
+++ b/tests/test_misc.py
@@ -8,10 +8,8 @@
 from unittest import main
 
 import click
-from basic_test_case import BasicTestCase
 from lxml import etree
 from pep440 import is_canonical
-from test_dna_utils import segments_from_pairs
 
 from readalongs._version import READALONG_FILE_FORMAT_VERSION, VERSION
 from readalongs.align import split_silences
@@ -28,6 +26,8 @@
     save_xml,
 )
 from readalongs.util import JoinerCallbackForClick
+from tests.basic_test_case import BasicTestCase
+from tests.test_dna_utils import segments_from_pairs
 
 
 class TestMisc(BasicTestCase):
diff --git a/tests/test_package_urls.py b/tests/test_package_urls.py
index 7fd41f22..6247bd14 100755
--- a/tests/test_package_urls.py
+++ b/tests/test_package_urls.py
@@ -3,13 +3,13 @@
 from unittest import main
 
 import requests
-from basic_test_case import BasicTestCase, silence_logs
 
 from readalongs.text.make_package import (
     FONTS_BUNDLE_URL,
     JS_BUNDLE_URL,
     fetch_bundle_file,
 )
+from tests.basic_test_case import BasicTestCase, silence_logs
 
 
 class TestPackageURLs(BasicTestCase):
diff --git a/tests/test_silence.py b/tests/test_silence.py
index fb23d81a..a1bcff95 100755
--- a/tests/test_silence.py
+++ b/tests/test_silence.py
@@ -5,11 +5,11 @@
 import os
 from unittest import main
 
-from basic_test_case import BasicTestCase
 from pydub import AudioSegment
 
 from readalongs.cli import align
 from readalongs.text.util import load_xml
+from tests.basic_test_case import BasicTestCase
 
 
 class TestSilence(BasicTestCase):
diff --git a/tests/test_smil.py b/tests/test_smil.py
index 4217b7c3..8bd08fa4 100644
--- a/tests/test_smil.py
+++ b/tests/test_smil.py
@@ -7,9 +7,8 @@
 from textwrap import dedent
 from unittest import main
 
-from basic_test_case import BasicTestCase
-
 from readalongs.text.make_smil import make_smil, parse_smil
+from tests.basic_test_case import BasicTestCase
 
 
 class TestSmilUtilities(BasicTestCase):
diff --git a/tests/test_tokenize_cli.py b/tests/test_tokenize_cli.py
index 31e20c36..9618dd93 100755
--- a/tests/test_tokenize_cli.py
+++ b/tests/test_tokenize_cli.py
@@ -6,9 +6,8 @@
 import os
 from unittest import main
 
-from basic_test_case import BasicTestCase
-
 from readalongs.cli import make_xml, tokenize
+from tests.basic_test_case import BasicTestCase
 
 # from readalongs.log import LOGGER
 
diff --git a/tests/test_web_api.py b/tests/test_web_api.py
index c8ba4c20..ec9327cd 100755
--- a/tests/test_web_api.py
+++ b/tests/test_web_api.py
@@ -10,8 +10,6 @@
 from unittest import main
 from unittest.mock import patch
 
-from basic_test_case import BasicTestCase
-
 from readalongs._version import READALONG_FILE_FORMAT_VERSION, VERSION
 from readalongs.log import LOGGER
 from readalongs.text.add_ids_to_xml import add_ids
@@ -20,6 +18,7 @@
 from readalongs.text.util import parse_xml
 from readalongs.util import get_langs
 from readalongs.web_api import OutputFormat, create_grammar, web_api_app
+from tests.basic_test_case import BasicTestCase
 
 
 class TestWebApi(BasicTestCase):