diff --git a/test/import_hook_tester_beartype.py b/test/import_hook_tester.py
similarity index 64%
rename from test/import_hook_tester_beartype.py
rename to test/import_hook_tester.py
index b77b756..e9f4369 100644
--- a/test/import_hook_tester_beartype.py
+++ b/test/import_hook_tester.py
@@ -22,10 +22,13 @@ import dataclasses
 import equinox as eqx
 import jax.numpy as jnp
 import pytest
+from helpers import ParamError, ReturnError
 
+import jaxtyping
 from jaxtyping import Float32
 
-from .helpers import ParamError
+
+# Test that functions get checked
 
 
 def g(x: Float32[jnp.ndarray, " b"]):
@@ -36,6 +39,8 @@ g(jnp.array([1.0]))
 with pytest.raises(ParamError):
     g(jnp.array(1))
 
+# Test that Equinox modules get checked
+
 
 class M(eqx.Module):
     foo: int
@@ -48,6 +53,8 @@ with pytest.raises(ParamError):
 with pytest.raises(ParamError):
     M(1, jnp.array(1.0))
 
+# Test that dataclasses get checked
+
 
 @dataclasses.dataclass
 class D:
@@ -60,3 +67,44 @@ with pytest.raises(ParamError):
     D(1.0, jnp.array([1.0]))
 with pytest.raises(ParamError):
     D(1, jnp.array(1.0))
+
+# Test that methods get checked
+
+
+class N(eqx.Module):
+    a: jnp.ndarray
+
+    def __init__(self, foo: str):
+        self.a = jnp.array(1)
+
+    def foo(self, x: jnp.ndarray):
+        pass
+
+    def bar(self) -> jnp.ndarray:
+        return self.a
+
+
+n = N("hi")
+with pytest.raises(ParamError):
+    N(123)
+with pytest.raises(ParamError):
+    n.foo("not_an_array_either")
+bad_n = eqx.tree_at(lambda x: x.a, n, "not_an_array")
+with pytest.raises(ReturnError):
+    bad_n.bar()
+
+# Test that converters work
+
+
+class BadConverter(eqx.Module):
+    a: jnp.ndarray = eqx.field(converter=lambda x: x)
+
+
+with pytest.raises(ParamError):
+    BadConverter(1)
+with pytest.raises(ParamError):
+    BadConverter("asdf")
+
+# Record that we've finished our checks successfully
+
+jaxtyping._test_import_hook_counter += 1
diff --git a/test/import_hook_tester_beartype_full.py b/test/import_hook_tester_beartype_full.py
deleted file mode 100644
index b77b756..0000000
--- a/test/import_hook_tester_beartype_full.py
+++ /dev/null
@@ -1,62 +0,0 @@
-# Copyright (c) 2022 Google LLC
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy of
-# this software and associated documentation files (the "Software"), to deal in
-# the Software without restriction, including without limitation the rights to
-# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-# the Software, and to permit persons to whom the Software is furnished to do so,
-# subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-import dataclasses
-
-import equinox as eqx
-import jax.numpy as jnp
-import pytest
-
-from jaxtyping import Float32
-
-from .helpers import ParamError
-
-
-def g(x: Float32[jnp.ndarray, " b"]):
-    pass
-
-
-g(jnp.array([1.0]))
-with pytest.raises(ParamError):
-    g(jnp.array(1))
-
-
-class M(eqx.Module):
-    foo: int
-    bar: Float32[jnp.ndarray, " a"]
-
-
-M(1, jnp.array([1.0]))
-with pytest.raises(ParamError):
-    M(1.0, jnp.array([1.0]))
-with pytest.raises(ParamError):
-    M(1, jnp.array(1.0))
-
-
-@dataclasses.dataclass
-class D:
-    foo: int
-    bar: Float32[jnp.ndarray, " a"]
-
-
-D(1, jnp.array([1.0]))
-with pytest.raises(ParamError):
-    D(1.0, jnp.array([1.0]))
-with pytest.raises(ParamError):
-    D(1, jnp.array(1.0))
diff --git a/test/import_hook_tester_beartype_old.py b/test/import_hook_tester_beartype_old.py
deleted file mode 100644
index b77b756..0000000
--- a/test/import_hook_tester_beartype_old.py
+++ /dev/null
@@ -1,62 +0,0 @@
-# Copyright (c) 2022 Google LLC
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy of
-# this software and associated documentation files (the "Software"), to deal in
-# the Software without restriction, including without limitation the rights to
-# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-# the Software, and to permit persons to whom the Software is furnished to do so,
-# subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-import dataclasses
-
-import equinox as eqx
-import jax.numpy as jnp
-import pytest
-
-from jaxtyping import Float32
-
-from .helpers import ParamError
-
-
-def g(x: Float32[jnp.ndarray, " b"]):
-    pass
-
-
-g(jnp.array([1.0]))
-with pytest.raises(ParamError):
-    g(jnp.array(1))
-
-
-class M(eqx.Module):
-    foo: int
-    bar: Float32[jnp.ndarray, " a"]
-
-
-M(1, jnp.array([1.0]))
-with pytest.raises(ParamError):
-    M(1.0, jnp.array([1.0]))
-with pytest.raises(ParamError):
-    M(1, jnp.array(1.0))
-
-
-@dataclasses.dataclass
-class D:
-    foo: int
-    bar: Float32[jnp.ndarray, " a"]
-
-
-D(1, jnp.array([1.0]))
-with pytest.raises(ParamError):
-    D(1.0, jnp.array([1.0]))
-with pytest.raises(ParamError):
-    D(1, jnp.array(1.0))
diff --git a/test/import_hook_tester_broken_checker.py b/test/import_hook_tester_broken_checker.py
deleted file mode 100644
index b77b756..0000000
--- a/test/import_hook_tester_broken_checker.py
+++ /dev/null
@@ -1,62 +0,0 @@
-# Copyright (c) 2022 Google LLC
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy of
-# this software and associated documentation files (the "Software"), to deal in
-# the Software without restriction, including without limitation the rights to
-# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-# the Software, and to permit persons to whom the Software is furnished to do so,
-# subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-import dataclasses
-
-import equinox as eqx
-import jax.numpy as jnp
-import pytest
-
-from jaxtyping import Float32
-
-from .helpers import ParamError
-
-
-def g(x: Float32[jnp.ndarray, " b"]):
-    pass
-
-
-g(jnp.array([1.0]))
-with pytest.raises(ParamError):
-    g(jnp.array(1))
-
-
-class M(eqx.Module):
-    foo: int
-    bar: Float32[jnp.ndarray, " a"]
-
-
-M(1, jnp.array([1.0]))
-with pytest.raises(ParamError):
-    M(1.0, jnp.array([1.0]))
-with pytest.raises(ParamError):
-    M(1, jnp.array(1.0))
-
-
-@dataclasses.dataclass
-class D:
-    foo: int
-    bar: Float32[jnp.ndarray, " a"]
-
-
-D(1, jnp.array([1.0]))
-with pytest.raises(ParamError):
-    D(1.0, jnp.array([1.0]))
-with pytest.raises(ParamError):
-    D(1, jnp.array(1.0))
diff --git a/test/import_hook_tester_transitive/__init__.py b/test/import_hook_tester_transitive/__init__.py
deleted file mode 100644
index 3501c8a..0000000
--- a/test/import_hook_tester_transitive/__init__.py
+++ /dev/null
@@ -1,20 +0,0 @@
-# Copyright (c) 2022 Google LLC
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy of
-# this software and associated documentation files (the "Software"), to deal in
-# the Software without restriction, including without limitation the rights to
-# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-# the Software, and to permit persons to whom the Software is furnished to do so,
-# subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-from . import another_file  # noqa: F401
diff --git a/test/import_hook_tester_transitive/another_file.py b/test/import_hook_tester_transitive/another_file.py
deleted file mode 100644
index c4fc46d..0000000
--- a/test/import_hook_tester_transitive/another_file.py
+++ /dev/null
@@ -1,48 +0,0 @@
-# Copyright (c) 2022 Google LLC
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy of
-# this software and associated documentation files (the "Software"), to deal in
-# the Software without restriction, including without limitation the rights to
-# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-# the Software, and to permit persons to whom the Software is furnished to do so,
-# subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-import jax.numpy as jnp
-import pytest
-
-from jaxtyping import Float32
-
-from ..helpers import ParamError
-
-
-def g(x: Float32[jnp.ndarray, " b"]):
-    pass
-
-
-g(jnp.array([1.0]))
-with pytest.raises(ParamError):
-    g(jnp.array(1))
-
-
-# Typeguard 3.0 no longer supports this
-#
-# class M(eqx.Module):
-#     foo: int
-#     bar: Float32[jnp.ndarray, " a"]
-
-
-# M(1, jnp.array([1.0]))
-# with pytest.raises(ParamError):
-#     M(1.0, jnp.array([1.0]))
-# with pytest.raises(ParamError):
-#     M(1, jnp.array(1.0))
diff --git a/test/import_hook_tester_typeguard.py b/test/import_hook_tester_typeguard.py
deleted file mode 100644
index b184215..0000000
--- a/test/import_hook_tester_typeguard.py
+++ /dev/null
@@ -1,63 +0,0 @@
-# Copyright (c) 2022 Google LLC
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy of
-# this software and associated documentation files (the "Software"), to deal in
-# the Software without restriction, including without limitation the rights to
-# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-# the Software, and to permit persons to whom the Software is furnished to do so,
-# subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-
-import jax.numpy as jnp
-import pytest
-
-from jaxtyping import Float32
-
-from .helpers import ParamError
-
-
-def g(x: Float32[jnp.ndarray, " b"]):
-    pass
-
-
-g(jnp.array([1.0]))
-with pytest.raises(ParamError):
-    g(jnp.array(1))
-
-
-# Typeguard 3.0 no longer supports this.
-#
-# class M(eqx.Module):
-#     foo: int
-#     bar: Float32[jnp.ndarray, " a"]
-#
-#
-# M(1, jnp.array([1.0]))
-# with pytest.raises(ParamError):
-#     M(1.0, jnp.array([1.0]))
-# with pytest.raises(ParamError):
-#     M(1, jnp.array(1.0))
-#
-#
-#
-# @dataclasses.dataclass
-# class D:
-#     foo: int
-#     bar: Float32[jnp.ndarray, " a"]
-#
-#
-# D(1, jnp.array([1.0]))
-# with pytest.raises(ParamError):
-#     D(1.0, jnp.array([1.0]))
-# with pytest.raises(ParamError):
-#     D(1, jnp.array(1.0))
diff --git a/test/import_hook_tester_typeguard_old.py b/test/import_hook_tester_typeguard_old.py
deleted file mode 100644
index b184215..0000000
--- a/test/import_hook_tester_typeguard_old.py
+++ /dev/null
@@ -1,63 +0,0 @@
-# Copyright (c) 2022 Google LLC
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy of
-# this software and associated documentation files (the "Software"), to deal in
-# the Software without restriction, including without limitation the rights to
-# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-# the Software, and to permit persons to whom the Software is furnished to do so,
-# subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-
-import jax.numpy as jnp
-import pytest
-
-from jaxtyping import Float32
-
-from .helpers import ParamError
-
-
-def g(x: Float32[jnp.ndarray, " b"]):
-    pass
-
-
-g(jnp.array([1.0]))
-with pytest.raises(ParamError):
-    g(jnp.array(1))
-
-
-# Typeguard 3.0 no longer supports this.
-#
-# class M(eqx.Module):
-#     foo: int
-#     bar: Float32[jnp.ndarray, " a"]
-#
-#
-# M(1, jnp.array([1.0]))
-# with pytest.raises(ParamError):
-#     M(1.0, jnp.array([1.0]))
-# with pytest.raises(ParamError):
-#     M(1, jnp.array(1.0))
-#
-#
-#
-# @dataclasses.dataclass
-# class D:
-#     foo: int
-#     bar: Float32[jnp.ndarray, " a"]
-#
-#
-# D(1, jnp.array([1.0]))
-# with pytest.raises(ParamError):
-#     D(1.0, jnp.array([1.0]))
-# with pytest.raises(ParamError):
-#     D(1, jnp.array(1.0))
diff --git a/test/test_import_hook.py b/test/test_import_hook.py
index 9f35fe4..6a1ef73 100644
--- a/test/test_import_hook.py
+++ b/test/test_import_hook.py
@@ -17,76 +17,114 @@
 # IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+import importlib
+import importlib.metadata
+import pathlib
+import shutil
+import sys
+import tempfile
+
 import pytest
 
-from jaxtyping import install_import_hook
+import jaxtyping
 
 
-def test_import_hook_typeguard_old():
-    hook = install_import_hook(
-        "test.import_hook_tester_typeguard_old", ("typeguard", "typechecked")
+_here = pathlib.Path(__file__).resolve().parent
+
+
+try:
+    typeguard_version = importlib.metadata.version("typeguard")
+except Exception as e:
+    raise ImportError("Could not find typeguard version") from e
+else:
+    try:
+        major, _, _ = typeguard_version.split(".")
+        major = int(major)
+    except Exception as e:
+        raise ImportError(
+            f"Unexpected typeguard version {typeguard_version}; not formatted as "
+            "`major.minor.patch`"
+        ) from e
+if major != 2:
+    raise ImportError(
+        "jaxtyping's tests required typeguard version 2. (Versions 3 and 4 are both "
+        "known to have bugs.)"
     )
-    with hook:
-        from . import import_hook_tester_typeguard_old  # noqa: F401
 
 
-def test_import_hook_typeguard():
-    hook = install_import_hook(
-        "test.import_hook_tester_typeguard", "typeguard.typechecked"
-    )
-    with hook:
-        from . import import_hook_tester_typeguard  # noqa: F401
+assert not hasattr(jaxtyping, "_test_import_hook_counter")
+jaxtyping._test_import_hook_counter = 0
 
 
-def test_import_hook_beartype_old():
+@pytest.fixture(scope="module")
+def importhook_tempdir():
+    with tempfile.TemporaryDirectory() as dir:
+        sys.path.append(dir)
+        dir = pathlib.Path(dir)
+        shutil.copyfile(_here / "helpers.py", dir / "helpers.py")
+        yield dir
+
+
+def _test_import_hook(importhook_tempdir, typechecker):
+    counter = jaxtyping._test_import_hook_counter
+    stem = f"import_hook_tester{counter}"
+    shutil.copyfile(_here / "import_hook_tester.py", importhook_tempdir / f"{stem}.py")
+    with jaxtyping.install_import_hook(stem, typechecker):
+        importlib.import_module(stem)
+    assert counter + 1 == jaxtyping._test_import_hook_counter
+
+
+def test_import_hook_typeguard_old(importhook_tempdir):
+    _test_import_hook(importhook_tempdir, ("typeguard", "typechecked"))
+
+
+def test_import_hook_typeguard(importhook_tempdir):
+    _test_import_hook(importhook_tempdir, "typeguard.typechecked")
+
+
+def test_import_hook_beartype_old(importhook_tempdir):
     try:
         import beartype  # noqa: F401
     except ImportError:
         pytest.skip("Beartype not installed")
     else:
-        hook = install_import_hook(
-            "test.import_hook_tester_beartype_old", ("beartype", "beartype")
-        )
-        with hook:
-            from . import import_hook_tester_beartype_old  # noqa: F401
+        _test_import_hook(importhook_tempdir, ("beartype", "beartype"))
 
 
-def test_import_hook_beartype():
+def test_import_hook_beartype(importhook_tempdir):
     try:
         import beartype  # noqa: F401
     except ImportError:
         pytest.skip("Beartype not installed")
     else:
-        hook = install_import_hook(
-            "test.import_hook_tester_beartype", "beartype.beartype"
-        )
-        with hook:
-            from . import import_hook_tester_beartype  # noqa: F401
+        _test_import_hook(importhook_tempdir, "beartype.beartype")
 
 
-def test_import_hook_beartype_full():
+def test_import_hook_beartype_full(importhook_tempdir):
     try:
         import beartype  # noqa: F401
     except ImportError:
         pytest.skip("Beartype not installed")
     else:
         bearchecker = "beartype.beartype(conf=beartype.BeartypeConf(strategy=beartype.BeartypeStrategy.On))"  # noqa: E501
-        hook = install_import_hook("test.import_hook_tester_beartype_full", bearchecker)
-        with hook:
-            from . import import_hook_tester_beartype_full  # noqa: F401
+        _test_import_hook(importhook_tempdir, bearchecker)
 
 
-def test_import_hook_transitive():
-    hook = install_import_hook(
-        "test.import_hook_tester_transitive", "typeguard.typechecked"
-    )
-    with hook:
-        from . import import_hook_tester_transitive  # noqa: F401
+def test_import_hook_broken_checker(importhook_tempdir):
+    with pytest.raises(AttributeError):
+        _test_import_hook(importhook_tempdir, "jaxtyping.does_not_exist")
 
 
-def test_import_hook_broken_checker():
-    hook = install_import_hook(
-        "test.import_hook_tester_broken_checker", "jaxtyping.does_not_exist"
-    )
-    with hook, pytest.raises(AttributeError):
-        from . import import_hook_tester_broken_checker  # noqa: F401
+def test_import_hook_transitive(importhook_tempdir):
+    typechecker = "typeguard.typechecked"
+    counter = jaxtyping._test_import_hook_counter
+    transitive_name = "jaxtyping_transitive_test"
+    transitive_dir = importhook_tempdir / transitive_name
+    transitive_dir.mkdir()
+    shutil.copyfile(_here / "import_hook_tester.py", transitive_dir / "tester.py")
+    with open(transitive_dir / "__init__.py", "w") as f:
+        f.write("from . import tester")
+        f.flush()
+    with jaxtyping.install_import_hook(transitive_name, typechecker):
+        importlib.import_module(transitive_name)
+    assert counter + 1 == jaxtyping._test_import_hook_counter