diff --git a/.gitignore b/.gitignore
index 7b46f43..bda6cf6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -59,3 +59,6 @@ perl/MYMETA.json
 python/python_subunit.egg-info/
 test-driver
 ar-lib
+*.o
+*.log
+*.trs
diff --git a/COPYING b/COPYING
index fc6b993..f29be9e 100644
--- a/COPYING
+++ b/COPYING
@@ -29,6 +29,6 @@ Code that has been incorporated into Subunit from other projects will
 naturally be under its own license, and will retain that license.
 
 A known list of such code is maintained here:
-* The runtests.py and python/subunit/tests/TestUtil.py module are GPL test
+* The runtests.py and python/tests/TestUtil.py module are GPL test
   support modules. They are not installed by Subunit - they are only ever
   used on the build machine.  Copyright 2004 Canonical Limited.
diff --git a/MANIFEST.in b/MANIFEST.in
index 4f521dc..5609031 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -18,3 +18,4 @@ exclude py-compile
 prune shell
 exclude stamp-h1
 include NEWS
+recursive-include python/tests *.py
diff --git a/Makefile.am b/Makefile.am
index 293a0fb..ec60153 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -12,23 +12,23 @@ EXTRA_DIST =  \
 	c/check-subunit-0.9.3.patch \
 	c/check-subunit-0.9.5.patch \
 	c/check-subunit-0.9.6.patch \
- 	python/subunit/tests/__init__.py \
- 	python/subunit/tests/sample-script.py \
- 	python/subunit/tests/sample-two-script.py \
- 	python/subunit/tests/test_chunked.py \
- 	python/subunit/tests/test_details.py \
- 	python/subunit/tests/test_filters.py \
- 	python/subunit/tests/test_filter_to_disk.py \
- 	python/subunit/tests/test_output_filter.py \
- 	python/subunit/tests/test_progress_model.py \
- 	python/subunit/tests/test_run.py \
- 	python/subunit/tests/test_subunit_filter.py \
- 	python/subunit/tests/test_subunit_stats.py \
- 	python/subunit/tests/test_subunit_tags.py \
- 	python/subunit/tests/test_tap2subunit.py \
- 	python/subunit/tests/test_test_protocol.py \
- 	python/subunit/tests/test_test_protocol2.py \
- 	python/subunit/tests/test_test_results.py \
+ 	python/tests/__init__.py \
+ 	python/tests/sample-script.py \
+ 	python/tests/sample-two-script.py \
+ 	python/tests/test_chunked.py \
+ 	python/tests/test_details.py \
+ 	python/tests/test_filters.py \
+ 	python/tests/test_filter_to_disk.py \
+ 	python/tests/test_output_filter.py \
+ 	python/tests/test_progress_model.py \
+ 	python/tests/test_run.py \
+ 	python/tests/test_subunit_filter.py \
+ 	python/tests/test_subunit_stats.py \
+ 	python/tests/test_subunit_tags.py \
+ 	python/tests/test_tap2subunit.py \
+ 	python/tests/test_test_protocol.py \
+ 	python/tests/test_test_protocol2.py \
+ 	python/tests/test_test_results.py \
 	python/subunit/filter_scripts/__init__.py \
 	python/subunit/filter_scripts/subunit_1to2.py \
 	python/subunit/filter_scripts/subunit2csv.py \
diff --git a/NEWS b/NEWS
index 943f18d..a314699 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,14 @@
 subunit release notes
 ---------------------
 
+1.4.6 (UNRELEASED)
+---------------------
+
+IMPROVEMENTS
+~~~~~~~~~~~~
+
+  * Stop installing tests. (Jelmer Vernooij)
+
 1.4.5 (2025-11-10)
 ---------------------
 
diff --git a/all_tests.py b/all_tests.py
index c702f55..e74c8c1 100644
--- a/all_tests.py
+++ b/all_tests.py
@@ -17,6 +17,7 @@
 import unittest
 
 import subunit
+import tests
 
 
 class ShellTests(subunit.ExecTestCase):
@@ -29,7 +30,7 @@ def test_functions(self):
 
 def test_suite():
     result = unittest.TestSuite()
-    result.addTest(subunit.test_suite())
+    result.addTest(tests.test_suite())
     result.addTest(ShellTests("test_sourcing"))
     result.addTest(ShellTests("test_functions"))
     return result
diff --git a/pyproject.toml b/pyproject.toml
index fce8b07..c6f3423 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,6 +5,15 @@ requires = ["iso8601", "setuptools>=61.2", "testtools"]
 [tool.ruff]
 line-length = 120
 
+[[tool.mypy.overrides]]
+module = [
+    "gi",
+    "gi.repository",
+    "junitxml",
+    "testscenarios",
+]
+ignore_missing_imports = true
+
 [project]
 authors = [
     { name = "Robert Collins", email = "subunit-dev@lists.launchpad.net" },
diff --git a/python/subunit/__init__.py b/python/subunit/__init__.py
index 2d5c118..f7a286b 100644
--- a/python/subunit/__init__.py
+++ b/python/subunit/__init__.py
@@ -175,12 +175,6 @@ def test_script_two(self):
 PROGRESS_POP = 3
 
 
-def test_suite():
-    import subunit.tests
-
-    return subunit.tests.test_suite()
-
-
 def join_dir(base_path, path):
     """
     Returns an absolute path to C{path}, calculated relative to the parent
diff --git a/python/subunit/v2.py b/python/subunit/v2.py
index 9f7fb4e..5951491 100644
--- a/python/subunit/v2.py
+++ b/python/subunit/v2.py
@@ -48,7 +48,7 @@
 EPOCH = datetime.datetime.fromtimestamp(0, tz=iso8601.UTC)
 NUL_ELEMENT = b"\0"[0]
 # Contains True for types for which 'nul in thing' falsely returns false.
-_nul_test_broken = {}
+_nul_test_broken: dict[type, bool] = {}
 
 
 def read_exactly(stream, size):
diff --git a/python/subunit/tests/__init__.py b/python/tests/__init__.py
similarity index 98%
rename from python/subunit/tests/__init__.py
rename to python/tests/__init__.py
index 244d624..b65d9ee 100644
--- a/python/subunit/tests/__init__.py
+++ b/python/tests/__init__.py
@@ -26,7 +26,7 @@
 _remote_exception_str_chunked = "57\r\n" + _remote_exception_str + ": boo qux\n0\r\n"
 
 
-from subunit.tests import (  # noqa: E402
+from . import (  # noqa: E402
     test_chunked,
     test_details,
     test_filter_to_disk,
diff --git a/python/subunit/tests/sample-script.py b/python/tests/sample-script.py
similarity index 87%
rename from python/subunit/tests/sample-script.py
rename to python/tests/sample-script.py
index d042765..c902605 100755
--- a/python/subunit/tests/sample-script.py
+++ b/python/tests/sample-script.py
@@ -7,7 +7,7 @@
 
     msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
 if len(sys.argv) == 2:
-    # subunit.tests.test_test_protocol.TestExecTestCase.test_sample_method_args
+    # tests.test_test_protocol.TestExecTestCase.test_sample_method_args
     # uses this code path to be sure that the arguments were passed to
     # sample-script.py
     print("test fail")
diff --git a/python/subunit/tests/sample-two-script.py b/python/tests/sample-two-script.py
similarity index 100%
rename from python/subunit/tests/sample-two-script.py
rename to python/tests/sample-two-script.py
diff --git a/python/subunit/tests/test_chunked.py b/python/tests/test_chunked.py
similarity index 100%
rename from python/subunit/tests/test_chunked.py
rename to python/tests/test_chunked.py
diff --git a/python/subunit/tests/test_details.py b/python/tests/test_details.py
similarity index 100%
rename from python/subunit/tests/test_details.py
rename to python/tests/test_details.py
diff --git a/python/subunit/tests/test_filter_to_disk.py b/python/tests/test_filter_to_disk.py
similarity index 100%
rename from python/subunit/tests/test_filter_to_disk.py
rename to python/tests/test_filter_to_disk.py
diff --git a/python/subunit/tests/test_filters.py b/python/tests/test_filters.py
similarity index 100%
rename from python/subunit/tests/test_filters.py
rename to python/tests/test_filters.py
diff --git a/python/subunit/tests/test_output_filter.py b/python/tests/test_output_filter.py
similarity index 100%
rename from python/subunit/tests/test_output_filter.py
rename to python/tests/test_output_filter.py
diff --git a/python/subunit/tests/test_progress_model.py b/python/tests/test_progress_model.py
similarity index 100%
rename from python/subunit/tests/test_progress_model.py
rename to python/tests/test_progress_model.py
diff --git a/python/subunit/tests/test_run.py b/python/tests/test_run.py
similarity index 94%
rename from python/subunit/tests/test_run.py
rename to python/tests/test_run.py
index ec3bf3b..22757a4 100644
--- a/python/subunit/tests/test_run.py
+++ b/python/tests/test_run.py
@@ -93,7 +93,7 @@ def test_exits_zero_when_tests_fail(self):
         try:
             self.assertEqual(
                 None,
-                run.main(argv=["progName", "subunit.tests.test_run.TestSubunitTestRunner.FailingTest"], stdout=stream),
+                run.main(argv=["progName", "tests.test_run.TestSubunitTestRunner.FailingTest"], stdout=stream),
             )
         except SystemExit:
             self.fail("SystemExit raised")
@@ -109,7 +109,7 @@ def test_exits_nonzero_when_execution_errors(self):
         exc = self.assertRaises(
             SystemExit,
             run.main,
-            argv=["progName", "subunit.tests.test_run.TestSubunitTestRunner.ExitingTest"],
+            argv=["progName", "tests.test_run.TestSubunitTestRunner.ExitingTest"],
             stdout=stream,
         )
         self.assertEqual(0, exc.args[0])
diff --git a/python/subunit/tests/test_subunit_filter.py b/python/tests/test_subunit_filter.py
similarity index 100%
rename from python/subunit/tests/test_subunit_filter.py
rename to python/tests/test_subunit_filter.py
diff --git a/python/subunit/tests/test_subunit_stats.py b/python/tests/test_subunit_stats.py
similarity index 100%
rename from python/subunit/tests/test_subunit_stats.py
rename to python/tests/test_subunit_stats.py
diff --git a/python/subunit/tests/test_subunit_tags.py b/python/tests/test_subunit_tags.py
similarity index 100%
rename from python/subunit/tests/test_subunit_tags.py
rename to python/tests/test_subunit_tags.py
diff --git a/python/subunit/tests/test_tap2subunit.py b/python/tests/test_tap2subunit.py
similarity index 100%
rename from python/subunit/tests/test_tap2subunit.py
rename to python/tests/test_tap2subunit.py
diff --git a/python/subunit/tests/test_test_protocol.py b/python/tests/test_test_protocol.py
similarity index 99%
rename from python/subunit/tests/test_test_protocol.py
rename to python/tests/test_test_protocol.py
index a8ea911..fc28c5c 100644
--- a/python/subunit/tests/test_test_protocol.py
+++ b/python/tests/test_test_protocol.py
@@ -32,7 +32,7 @@
 import iso8601
 
 import subunit
-from subunit.tests import (
+from . import (
     _remote_exception_repr,
     _remote_exception_repr_chunked,
     _remote_exception_str,
diff --git a/python/subunit/tests/test_test_protocol2.py b/python/tests/test_test_protocol2.py
similarity index 98%
rename from python/subunit/tests/test_test_protocol2.py
rename to python/tests/test_test_protocol2.py
index 2874e43..7ba20c8 100644
--- a/python/subunit/tests/test_test_protocol2.py
+++ b/python/tests/test_test_protocol2.py
@@ -16,6 +16,8 @@
 
 import datetime
 from io import BytesIO
+from typing import Callable, Optional
+from types import ModuleType
 
 try:
     from hypothesis import given
@@ -25,17 +27,17 @@
     # Settings.default.verbosity = Verbosity.verbose
     import hypothesis.strategies as st
 except ImportError:
-    given = None
-    st = None
+    given: Optional[Callable[..., Callable[..., None]]] = None  # type: ignore[assignment,no-redef]
+    st: Optional[ModuleType] = None  # type: ignore[assignment,no-redef]
 from testtools import TestCase
 from testtools.matchers import Contains, HasLength
 from testtools.testresult.doubles import StreamResult
 
 try:
-    from testtools.tests.test_testresult import TestStreamResultContract
+    from testtools.tests.test_testresult import TestStreamResultContract  # type: ignore[import-not-found]
 except ImportError:
     # testtools >= 2.8 no longer includes the tests submodule
-    TestStreamResultContract = None
+    TestStreamResultContract: Optional[type] = None  # type: ignore[assignment,misc,no-redef]
 
 import subunit
 import iso8601
diff --git a/python/subunit/tests/test_test_results.py b/python/tests/test_test_results.py
similarity index 100%
rename from python/subunit/tests/test_test_results.py
rename to python/tests/test_test_results.py