diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9701cdf81..8187aa0d3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -81,8 +81,8 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
-      -  name: Run Linters
-         run: |
+      - name: Run Linters
+        run: |
           hatch run typing:test
           hatch run lint:style
           pipx run interrogate -vv .
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 0a955ea56..4d68ae2fb 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,5 +1,6 @@
 ci:
   autoupdate_schedule: monthly
+  autoupdate_commit_msg: "chore: update pre-commit hooks"
 
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
@@ -29,14 +30,47 @@ repos:
     rev: 0.7.17
     hooks:
       - id: mdformat
+        additional_dependencies:
+          [mdformat-gfm, mdformat-frontmatter, mdformat-footnote]
 
-  - repo: https://github.com/psf/black
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: "v3.0.2"
+    hooks:
+      - id: prettier
+        types_or: [yaml, html, json]
+
+  - repo: https://github.com/adamchainz/blacken-docs
+    rev: "1.16.0"
+    hooks:
+      - id: blacken-docs
+        additional_dependencies: [black==23.7.0]
+
+  - repo: https://github.com/psf/black-pre-commit-mirror
     rev: 23.7.0
     hooks:
       - id: black
 
+  - repo: https://github.com/codespell-project/codespell
+    rev: "v2.2.5"
+    hooks:
+      - id: codespell
+        args: ["-L", "sur,nd"]
+
+  - repo: https://github.com/pre-commit/pygrep-hooks
+    rev: "v1.10.0"
+    hooks:
+      - id: rst-backticks
+      - id: rst-directive-colons
+      - id: rst-inline-touching-normal
+
   - repo: https://github.com/astral-sh/ruff-pre-commit
     rev: v0.0.287
     hooks:
       - id: ruff
-        args: ["--fix"]
+        args: ["--fix", "--show-fixes"]
+
+  - repo: https://github.com/scientific-python/cookie
+    rev: "2023.08.23"
+    hooks:
+      - id: sp-repo-review
+        additional_dependencies: ["repo-review[cli]"]
diff --git a/examples/embedding/inprocess_qtconsole.py b/examples/embedding/inprocess_qtconsole.py
index c346a97fb..18ce28638 100644
--- a/examples/embedding/inprocess_qtconsole.py
+++ b/examples/embedding/inprocess_qtconsole.py
@@ -19,7 +19,7 @@ def init_asyncio_patch():
     asyncio implementation on Windows
     Pick the older SelectorEventLoopPolicy on Windows
     if the known-incompatible default policy is in use.
-    do this as early as possible to make it a low priority and overrideable
+    do this as early as possible to make it a low priority and overridable
     ref: https://github.com/tornadoweb/tornado/issues/2608
     FIXME: if/when tornado supports the defaults in asyncio,
            remove and bump tornado requirement for py38
diff --git a/examples/embedding/inprocess_terminal.py b/examples/embedding/inprocess_terminal.py
index 79e11e03a..b644c94af 100644
--- a/examples/embedding/inprocess_terminal.py
+++ b/examples/embedding/inprocess_terminal.py
@@ -19,7 +19,7 @@ def init_asyncio_patch():
     asyncio implementation on Windows
     Pick the older SelectorEventLoopPolicy on Windows
     if the known-incompatible default policy is in use.
-    do this as early as possible to make it a low priority and overrideable
+    do this as early as possible to make it a low priority and overridable
     ref: https://github.com/tornadoweb/tornado/issues/2608
     FIXME: if/when tornado supports the defaults in asyncio,
            remove and bump tornado requirement for py38
diff --git a/ipykernel/debugger.py b/ipykernel/debugger.py
index 1c9b94395..90e4f8885 100644
--- a/ipykernel/debugger.py
+++ b/ipykernel/debugger.py
@@ -40,7 +40,7 @@
         raise e
 
 
-# Required for backwards compatiblity
+# Required for backwards compatibility
 ROUTING_ID = getattr(zmq, "ROUTING_ID", None) or zmq.IDENTITY
 
 
@@ -644,7 +644,7 @@ async def richInspectVariables(self, message):
         repr_data = {}
         repr_metadata = {}
         if not self.stopped_threads:
-            # The code did not hit a breakpoint, we use the intepreter
+            # The code did not hit a breakpoint, we use the interpreter
             # to get the rich representation of the variable
             result = get_ipython().user_expressions({var_name: var_name})[var_name]
             if result.get("status", "error") == "ok":
diff --git a/ipykernel/eventloops.py b/ipykernel/eventloops.py
index 4082f4cf7..ef54f4105 100644
--- a/ipykernel/eventloops.py
+++ b/ipykernel/eventloops.py
@@ -429,7 +429,7 @@ async def close_loop():
         close_loop()
 
     elif not loop.is_closed():
-        loop.run_until_complete(close_loop)  # type:ignore
+        loop.run_until_complete(close_loop)  # type:ignore[arg-type]
         loop.close()
 
 
@@ -566,8 +566,12 @@ def enable_gui(gui, kernel=None):
             make_qt_app_for_kernel(gui, kernel)
 
     loop = loop_map[gui]
-    if loop and kernel.eventloop is not None and kernel.eventloop is not loop:
-        msg = "Cannot activate multiple GUI eventloops"
+    if (
+        loop
+        and kernel.eventloop is not None
+        and kernel.eventloop is not loop  # type:ignore[unreachable]
+    ):
+        msg = "Cannot activate multiple GUI eventloops"  # type:ignore[unreachable]
         raise RuntimeError(msg)
     kernel.eventloop = loop
     # We set `eventloop`; the function the user chose is executed in `Kernel.enter_eventloop`, thus
diff --git a/ipykernel/inprocess/channels.py b/ipykernel/inprocess/channels.py
index 964015ed3..d3f03fcfd 100644
--- a/ipykernel/inprocess/channels.py
+++ b/ipykernel/inprocess/channels.py
@@ -18,7 +18,7 @@ class InProcessChannel:
     proxy_methods: List[object] = []
 
     def __init__(self, client=None):
-        """Initialze the channel."""
+        """Initialize the channel."""
         super().__init__()
         self.client = client
         self._is_alive = False
diff --git a/ipykernel/inprocess/client.py b/ipykernel/inprocess/client.py
index ea964ecde..1fa80bc20 100644
--- a/ipykernel/inprocess/client.py
+++ b/ipykernel/inprocess/client.py
@@ -193,7 +193,7 @@ def _dispatch_to_kernel(self, msg):
             dispatch_shell = run_sync(kernel.dispatch_shell)
             dispatch_shell(msg_parts)
         else:
-            loop = asyncio.get_event_loop()
+            loop = asyncio.get_event_loop()  # type:ignore[unreachable]
             loop.run_until_complete(kernel.dispatch_shell(msg_parts))
         idents, reply_msg = self.session.recv(stream, copy=False)
         self.shell_channel.call_handlers_later(reply_msg)
diff --git a/ipykernel/inprocess/ipkernel.py b/ipykernel/inprocess/ipkernel.py
index 3f7fcce9e..f3cac4a8c 100644
--- a/ipykernel/inprocess/ipkernel.py
+++ b/ipykernel/inprocess/ipkernel.py
@@ -111,7 +111,7 @@ def _input_request(self, prompt, ident, parent, password=False):
         # Await a response.
         while self.raw_input_str is None:
             frontend.stdin_channel.process_events()
-        return self.raw_input_str
+        return self.raw_input_str  # type:ignore[unreachable]
 
     # -------------------------------------------------------------------------
     # Protected interface
diff --git a/ipykernel/iostream.py b/ipykernel/iostream.py
index 87834e26b..0c8a2fa9d 100644
--- a/ipykernel/iostream.py
+++ b/ipykernel/iostream.py
@@ -93,7 +93,7 @@ def _start_event_gc():
         if self._event_pipe_gc_task is not None:
             # cancel gc task to avoid pending task warnings
             async def _cancel():
-                self._event_pipe_gc_task.cancel()  # type:ignore
+                self._event_pipe_gc_task.cancel()  # type:ignore[union-attr]
 
             if not self._stopped:
                 self.io_loop.run_sync(_cancel)
@@ -373,7 +373,7 @@ def fileno(self):
 
     def _watch_pipe_fd(self):
         """
-        We've redirected standards steams 0 and 1 into a pipe.
+        We've redirected standards streams 0 and 1 into a pipe.
 
         We need to watch in a thread and redirect them to the right places.
 
@@ -424,7 +424,7 @@ def __init__(
             that will swap the give file descriptor for a pipe, read from the
             pipe, and insert this into the current Stream.
         isatty : bool (default, False)
-            Indication of whether this stream has termimal capabilities (e.g. can handle colors)
+            Indication of whether this stream has terminal capabilities (e.g. can handle colors)
 
         """
         if pipe is not None:
@@ -634,7 +634,7 @@ def write(self, string: str) -> Optional[int]:  # type:ignore[override]
         """
 
         if not isinstance(string, str):
-            msg = f"write() argument must be str, not {type(string)}"
+            msg = f"write() argument must be str, not {type(string)}"  # type:ignore[unreachable]
             raise TypeError(msg)
 
         if self.echo is not None:
diff --git a/ipykernel/ipkernel.py b/ipykernel/ipkernel.py
index c1c79e942..f82831cc7 100644
--- a/ipykernel/ipkernel.py
+++ b/ipykernel/ipkernel.py
@@ -29,7 +29,7 @@
 try:
     from IPython.core.interactiveshell import _asyncio_runner  # type:ignore[attr-defined]
 except ImportError:
-    _asyncio_runner = None  # type:ignore
+    _asyncio_runner = None  # type:ignore[assignment]
 
 try:
     from IPython.core.completer import provisionalcompleter as _provisionalcompleter
@@ -328,7 +328,7 @@ def set_sigint_result():
             # use add_callback for thread safety
             self.io_loop.add_callback(set_sigint_result)
 
-        # set the custom sigint hander during this context
+        # set the custom sigint handler during this context
         save_sigint = signal.signal(signal.SIGINT, handle_sigint)
         try:
             yield
@@ -377,7 +377,7 @@ async def run_cell(*args, **kwargs):
                 preprocessing_exc_tuple = sys.exc_info()
 
             if (
-                _asyncio_runner
+                _asyncio_runner  # type:ignore[truthy-bool]
                 and shell.loop_runner is _asyncio_runner
                 and asyncio.get_event_loop().is_running()
                 and should_run_async(
diff --git a/ipykernel/kernelapp.py b/ipykernel/kernelapp.py
index da6d19656..990d6ba4f 100644
--- a/ipykernel/kernelapp.py
+++ b/ipykernel/kernelapp.py
@@ -460,9 +460,9 @@ def init_blackhole(self):
         if self.no_stdout or self.no_stderr:
             blackhole = open(os.devnull, "w")  # noqa
             if self.no_stdout:
-                sys.stdout = sys.__stdout__ = blackhole  # type:ignore
+                sys.stdout = sys.__stdout__ = blackhole  # type:ignore[misc]
             if self.no_stderr:
-                sys.stderr = sys.__stderr__ = blackhole  # type:ignore
+                sys.stderr = sys.__stderr__ = blackhole  # type:ignore[misc]
 
     def init_io(self):
         """Redirect input streams and set a display hook."""
@@ -634,7 +634,7 @@ def _init_asyncio_patch(self):
         but it is still preferable to run the Selector in the main thread
         instead of the background.
 
-        do this as early as possible to make it a low priority and overrideable
+        do this as early as possible to make it a low priority and overridable
 
         ref: https://github.com/tornadoweb/tornado/issues/2608
 
@@ -670,8 +670,8 @@ def init_pdb(self):
 
         if hasattr(debugger, "InterruptiblePdb"):
             # Only available in newer IPython releases:
-            debugger.Pdb = debugger.InterruptiblePdb  # type:ignore
-            pdb.Pdb = debugger.Pdb  # type:ignore
+            debugger.Pdb = debugger.InterruptiblePdb  # type:ignore[misc]
+            pdb.Pdb = debugger.Pdb  # type:ignore[assignment,misc]
             pdb.set_trace = debugger.set_trace  # type:ignore[assignment]
 
     @catch_config_error
diff --git a/ipykernel/parentpoller.py b/ipykernel/parentpoller.py
index b6b34f7e5..a6d9c7538 100644
--- a/ipykernel/parentpoller.py
+++ b/ipykernel/parentpoller.py
@@ -66,7 +66,7 @@ def __init__(self, interrupt_handle=None, parent_handle=None):
         assert interrupt_handle or parent_handle
         super().__init__()
         if ctypes is None:
-            msg = "ParentPollerWindows requires ctypes"
+            msg = "ParentPollerWindows requires ctypes"  # type:ignore[unreachable]
             raise ImportError(msg)
         self.daemon = True
         self.interrupt_handle = interrupt_handle
diff --git a/ipykernel/trio_runner.py b/ipykernel/trio_runner.py
index 62fc9ea35..977302a8a 100644
--- a/ipykernel/trio_runner.py
+++ b/ipykernel/trio_runner.py
@@ -65,6 +65,6 @@ async def loc(coro):
             self._cell_cancel_scope = trio.CancelScope()
             with self._cell_cancel_scope:
                 return await coro
-            self._cell_cancel_scope = None
+            self._cell_cancel_scope = None  # type:ignore[unreachable]
 
         return trio.from_thread.run(loc, async_fn, trio_token=self._trio_token)
diff --git a/pyproject.toml b/pyproject.toml
index 8cb453302..21181273e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -86,7 +86,7 @@ path = "ipykernel/_version.py"
 features = ["docs"]
 [tool.hatch.envs.docs.scripts]
 build = "make -C docs html SPHINXOPTS='-W'"
-api = "sphinx-apidoc -o docs/api -f -E ipykernel ipykernel/tests ipykernel/inprocess/tests ipykernel/datapub.py ipykernel/pickleutil.py ipykernel/serialize.py ipykernel/gui ipykernel/pylab"
+api = "sphinx-apidoc -o docs/api -f -E ipykernel tests ipykernel/datapub.py ipykernel/pickleutil.py ipykernel/serialize.py ipykernel/gui ipykernel/pylab"
 
 [tool.hatch.envs.test]
 features = ["test"]
@@ -112,7 +112,7 @@ matrix.qt.features = [
 
 [tool.hatch.envs.typing]
 features = ["test"]
-dependencies = ["mypy>=0.990"]
+dependencies = ["mypy>=1.5.1"]
 [tool.hatch.envs.typing.scripts]
 test = "mypy --install-types --non-interactive {args:.}"
 
@@ -135,6 +135,7 @@ fmt = [
 check_untyped_defs = true
 disallow_incomplete_defs = true
 disallow_untyped_decorators = true
+enable_error_code = ["ignore-without-code", "redundant-expr", "truthy-bool"]
 follow_imports = "normal"
 ignore_missing_imports = true
 no_implicit_optional = true
@@ -147,13 +148,34 @@ strict_optional = true
 warn_unused_configs = true
 warn_redundant_casts = true
 warn_return_any = true
+warn_unreachable = true
 warn_unused_ignores = true
 
+[[tool.mypy.overrides]]
+module = "tests.*"
+disable_error_code = ["ignore-without-code"]
+warn_unreachable = false
+
 [tool.pytest.ini_options]
-addopts = "-raXs --durations 10 --color=yes --doctest-modules --ignore=ipykernel/pylab/backend_inline.py --ignore=ipykernel/pylab/config.py --ignore=ipykernel/gui/gtk3embed.py --ignore=ipykernel/gui/gtkembed.py --ignore=ipykernel/datapub.py --ignore=ipykernel/log.py --ignore=ipykernel/pickleutil.py --ignore=ipykernel/serialize.py --ignore=ipykernel/_eventloop_macos.py"
+minversion = "6.0"
+xfail_strict = true
+log_cli_level = "info"
+addopts = [
+  "-raXs", "--durations=10", "--color=yes", "--doctest-modules",
+   "--showlocals", "--strict-markers", "--strict-config",
+   "--ignore=ipykernel/pylab/backend_inline.py",
+   "--ignore=ipykernel/pylab/config.py",
+   "--ignore=ipykernel/gui/gtk3embed.py",
+   "--ignore=ipykernel/gui/gtkembed.py",
+   "--ignore=ipykernel/datapub.py",
+   "--ignore=ipykernel/log.py",
+   "--ignore=ipykernel/pickleutil.py",
+   "--ignore=ipykernel/serialize.py",
+   "--ignore=ipykernel/_eventloop_macos.py"
+]
 testpaths = [
-    "ipykernel/tests",
-    "ipykernel/inprocess/tests"
+    "tests",
+    "tests/inprocess"
 ]
 asyncio_mode = "auto"
 timeout = 300
@@ -195,14 +217,13 @@ exclude_lines = [
 relative_files = true
 source = ["ipykernel"]
 omit = [
-  "ipykernel/tests/*",
+  "tests/*",
   "ipykernel/datapub.py",
   "ipykernel/debugger.py",
   "ipykernel/eventloops.py",
   "ipykernel/log.py",
   "ipykernel/pickleutil.py",
   "ipykernel/serialize.py",
-  "ipykernel/inprocess/tests/*",
   "ipykernel/gui/*",
   "ipykernel/pylab/*",
 ]
@@ -304,7 +325,7 @@ unfixable = [
 # PLC1901 `stderr == ""` can be simplified to `not stderr` as an empty string is falsey
 # B018 Found useless expression. Either assign it to a variable or remove it.
 # S603 `subprocess` call: check for execution of untrusted input
-"ipykernel/tests/*" = ["B011", "F841", "C408", "E402", "T201", "B007", "N802", "F841", "EM101",
+"tests/*" = ["B011", "F841", "C408", "E402", "T201", "B007", "N802", "F841", "EM101",
     "EM102", "EM103", "PLR2004", "PLW0603", "PLW2901", "PLC1901", "B018", "S603"]
 
 [tool.interrogate]
@@ -315,8 +336,11 @@ ignore-property-decorators=true
 ignore-nested-functions=true
 ignore-nested-classes=true
 fail-under=95
-exclude = ["docs", "*/tests"]
+exclude = ["docs", "tests"]
 
 [tool.check-wheel-contents]
 toplevel = ["ipykernel/", "ipykernel_launcher.py"]
 ignore = ["W002"]
+
+[tool.repo-review]
+ignore = ["PY007", "PP308", "GH102", "PC140", "MY101"]
diff --git a/ipykernel/tests/__init__.py b/tests/__init__.py
similarity index 100%
rename from ipykernel/tests/__init__.py
rename to tests/__init__.py
diff --git a/ipykernel/tests/_asyncio_utils.py b/tests/_asyncio_utils.py
similarity index 100%
rename from ipykernel/tests/_asyncio_utils.py
rename to tests/_asyncio_utils.py
diff --git a/ipykernel/tests/conftest.py b/tests/conftest.py
similarity index 100%
rename from ipykernel/tests/conftest.py
rename to tests/conftest.py
diff --git a/ipykernel/inprocess/tests/__init__.py b/tests/inprocess/__init__.py
similarity index 100%
rename from ipykernel/inprocess/tests/__init__.py
rename to tests/inprocess/__init__.py
diff --git a/ipykernel/inprocess/tests/test_kernel.py b/tests/inprocess/test_kernel.py
similarity index 98%
rename from ipykernel/inprocess/tests/test_kernel.py
rename to tests/inprocess/test_kernel.py
index b85c4bdfe..793485d95 100644
--- a/ipykernel/inprocess/tests/test_kernel.py
+++ b/tests/inprocess/test_kernel.py
@@ -12,7 +12,8 @@
 from ipykernel.inprocess.blocking import BlockingInProcessKernelClient
 from ipykernel.inprocess.ipkernel import InProcessKernel
 from ipykernel.inprocess.manager import InProcessKernelManager
-from ipykernel.tests.utils import assemble_output
+
+from ..utils import assemble_output
 
 orig_msg = Session.msg
 
diff --git a/ipykernel/inprocess/tests/test_kernelmanager.py b/tests/inprocess/test_kernelmanager.py
similarity index 100%
rename from ipykernel/inprocess/tests/test_kernelmanager.py
rename to tests/inprocess/test_kernelmanager.py
diff --git a/ipykernel/tests/test_async.py b/tests/test_async.py
similarity index 100%
rename from ipykernel/tests/test_async.py
rename to tests/test_async.py
diff --git a/ipykernel/tests/test_comm.py b/tests/test_comm.py
similarity index 100%
rename from ipykernel/tests/test_comm.py
rename to tests/test_comm.py
diff --git a/ipykernel/tests/test_connect.py b/tests/test_connect.py
similarity index 100%
rename from ipykernel/tests/test_connect.py
rename to tests/test_connect.py
diff --git a/ipykernel/tests/test_debugger.py b/tests/test_debugger.py
similarity index 98%
rename from ipykernel/tests/test_debugger.py
rename to tests/test_debugger.py
index c46064425..48fafb42e 100644
--- a/ipykernel/tests/test_debugger.py
+++ b/tests/test_debugger.py
@@ -121,7 +121,11 @@ def test_set_breakpoints(kernel_with_debug):
     assert reply["body"]["breakpoints"][0]["source"]["path"] == source
 
     r = wait_for_debug_request(kernel_with_debug, "debugInfo")
-    assert source in map(lambda b: b["source"], r["body"]["breakpoints"])  # noqa
+
+    def func(b):
+        return b["source"]
+
+    assert source in map(func, r["body"]["breakpoints"])
 
     r = wait_for_debug_request(kernel_with_debug, "configurationDone")
     assert r["success"]
@@ -208,7 +212,11 @@ def test_rich_inspect_not_at_breakpoint(kernel_with_debug):
     get_reply(kernel_with_debug, msg_id)
 
     r = wait_for_debug_request(kernel_with_debug, "inspectVariables")
-    assert var_name in list(map(lambda v: v["name"], r["body"]["variables"]))  # noqa
+
+    def func(v):
+        return v["name"]
+
+    assert var_name in list(map(func, r["body"]["variables"]))
 
     reply = wait_for_debug_request(
         kernel_with_debug,
diff --git a/ipykernel/tests/test_embed_kernel.py b/tests/test_embed_kernel.py
similarity index 100%
rename from ipykernel/tests/test_embed_kernel.py
rename to tests/test_embed_kernel.py
diff --git a/ipykernel/tests/test_eventloop.py b/tests/test_eventloop.py
similarity index 97%
rename from ipykernel/tests/test_eventloop.py
rename to tests/test_eventloop.py
index a4d18d114..26924cfbe 100644
--- a/ipykernel/tests/test_eventloop.py
+++ b/tests/test_eventloop.py
@@ -57,7 +57,7 @@ def teardown():
 
 
 async_code = """
-from ipykernel.tests._asyncio_utils import async_func
+from tests._asyncio_utils import async_func
 async_func()
 """
 
@@ -144,7 +144,7 @@ def test_qt_enable_gui(kernel, capsys):
     enable_gui(gui, kernel)
     assert app == kernel.app
 
-    # Event loop intergration can be turned off.
+    # Event loop integration can be turned off.
     enable_gui(None, kernel)
     assert not hasattr(kernel, 'app')
 
diff --git a/ipykernel/tests/test_heartbeat.py b/tests/test_heartbeat.py
similarity index 100%
rename from ipykernel/tests/test_heartbeat.py
rename to tests/test_heartbeat.py
diff --git a/ipykernel/tests/test_io.py b/tests/test_io.py
similarity index 99%
rename from ipykernel/tests/test_io.py
rename to tests/test_io.py
index fee1e6020..98f047899 100644
--- a/ipykernel/tests/test_io.py
+++ b/tests/test_io.py
@@ -125,7 +125,6 @@ async def test_event_pipe_gc(iopub_thread):
         isatty=True,
         watchfd=False,
     )
-    save_stdout = sys.stdout
     assert iopub_thread._event_pipes == {}
     with stream, mock.patch.object(sys, "stdout", stream), ThreadPoolExecutor(1) as pool:
         pool.submit(print, "x").result()
@@ -201,7 +200,6 @@ def test_echo_watch(ctx):
     port = s.bind_to_random_port("tcp://127.0.0.1")
     url = f"tcp://127.0.0.1:{port}"
     session = Session(key=b'abc')
-    messages = []
     stdout_chunks = []
     with s:
         env = dict(os.environ)
diff --git a/ipykernel/tests/test_ipkernel_direct.py b/tests/test_ipkernel_direct.py
similarity index 98%
rename from ipykernel/tests/test_ipkernel_direct.py
rename to tests/test_ipkernel_direct.py
index b0dbb01f5..c9201348c 100644
--- a/ipykernel/tests/test_ipkernel_direct.py
+++ b/tests/test_ipkernel_direct.py
@@ -96,7 +96,8 @@ async def test_direct_interrupt_request(ipkernel):
 
     # test failure on interrupt request
     def raiseOSError():
-        raise OSError("evalue")
+        msg = "evalue"
+        raise OSError(msg)
 
     ipkernel._send_interrupt_children = raiseOSError
     reply = await ipkernel.test_control_message("interrupt_request", {})
@@ -212,5 +213,5 @@ def test_finish_metadata(ipkernel: IPythonKernel) -> None:
 
 async def test_do_debug_request(ipkernel: IPythonKernel) -> None:
     msg = ipkernel.session.msg("debug_request", {})
-    msg_list = ipkernel.session.serialize(msg)
+    ipkernel.session.serialize(msg)
     await ipkernel.do_debug_request(msg)
diff --git a/ipykernel/tests/test_jsonutil.py b/tests/test_jsonutil.py
similarity index 97%
rename from ipykernel/tests/test_jsonutil.py
rename to tests/test_jsonutil.py
index faace16a7..2f7e5dbcd 100644
--- a/ipykernel/tests/test_jsonutil.py
+++ b/tests/test_jsonutil.py
@@ -11,8 +11,8 @@
 import pytest
 from jupyter_client._version import version_info as jupyter_client_version
 
-from .. import jsonutil
-from ..jsonutil import encode_images, json_clean
+from ipykernel import jsonutil
+from ipykernel.jsonutil import encode_images, json_clean
 
 JUPYTER_CLIENT_MAJOR_VERSION: int = jupyter_client_version[0]  # type:ignore
 
diff --git a/ipykernel/tests/test_kernel.py b/tests/test_kernel.py
similarity index 98%
rename from ipykernel/tests/test_kernel.py
rename to tests/test_kernel.py
index 49fc1c08d..07411bd13 100644
--- a/ipykernel/tests/test_kernel.py
+++ b/tests/test_kernel.py
@@ -42,7 +42,7 @@ def _check_master(kc, expected=True, stream="stdout"):
 def _check_status(content):
     """If status=error, show the traceback"""
     if content["status"] == "error":
-        assert False, "".join(["\n"] + content["traceback"])
+        raise AssertionError("".join(["\n"] + content["traceback"]))
 
 
 # printing tests
@@ -196,12 +196,10 @@ def test_subprocess_error():
 def test_raw_input():
     """test input"""
     with kernel() as kc:
-        iopub = kc.iopub_channel
-
         input_f = "input"
         theprompt = "prompt> "
         code = f'print({input_f}("{theprompt}"))'
-        msg_id = kc.execute(code, allow_stdin=True)
+        kc.execute(code, allow_stdin=True)
         msg = kc.get_stdin_msg(timeout=TIMEOUT)
         assert msg["header"]["msg_type"] == "input_request"
         content = msg["content"]
@@ -232,7 +230,7 @@ def test_save_history():
 
 
 def test_smoke_faulthandler():
-    faulthadler = pytest.importorskip("faulthandler", reason="this test needs faulthandler")
+    pytest.importorskip("faulthandler", reason="this test needs faulthandler")
     with kernel() as kc:
         # Note: faulthandler.register is not available on windows.
         code = "\n".join(
diff --git a/ipykernel/tests/test_kernel_direct.py b/tests/test_kernel_direct.py
similarity index 99%
rename from ipykernel/tests/test_kernel_direct.py
rename to tests/test_kernel_direct.py
index 7f47aaedd..dfb8a70fe 100644
--- a/ipykernel/tests/test_kernel_direct.py
+++ b/tests/test_kernel_direct.py
@@ -75,7 +75,8 @@ async def test_direct_interrupt_request(kernel):
 
     # test failure on interrupt request
     def raiseOSError():
-        raise OSError("evalue")
+        msg = "evalue"
+        raise OSError(msg)
 
     kernel._send_interrupt_children = raiseOSError
     reply = await kernel.test_control_message("interrupt_request", {})
diff --git a/ipykernel/tests/test_kernelapp.py b/tests/test_kernelapp.py
similarity index 100%
rename from ipykernel/tests/test_kernelapp.py
rename to tests/test_kernelapp.py
diff --git a/ipykernel/tests/test_kernelspec.py b/tests/test_kernelspec.py
similarity index 100%
rename from ipykernel/tests/test_kernelspec.py
rename to tests/test_kernelspec.py
diff --git a/ipykernel/tests/test_message_spec.py b/tests/test_message_spec.py
similarity index 98%
rename from ipykernel/tests/test_message_spec.py
rename to tests/test_message_spec.py
index 5710cf297..0c9e777cd 100644
--- a/ipykernel/tests/test_message_spec.py
+++ b/tests/test_message_spec.py
@@ -53,7 +53,7 @@ def check(self, d):
             try:
                 setattr(self, key, d[key])
             except TraitError as e:
-                assert False, str(e)
+                raise AssertionError(str(e)) from None
 
 
 class Version(Unicode):
@@ -65,9 +65,11 @@ def __init__(self, *args, **kwargs):
 
     def validate(self, obj, value):
         if self.min and V(value) < V(self.min):
-            raise TraitError(f"bad version: {value} < {self.min}")
+            msg = f"bad version: {value} < {self.min}"
+            raise TraitError(msg)
         if self.max and (V(value) > V(self.max)):
-            raise TraitError(f"bad version: {value} > {self.max}")
+            msg = f"bad version: {value} > {self.max}"
+            raise TraitError(msg)
 
 
 class RMessage(Reference):
@@ -469,7 +471,7 @@ def test_oinfo_detail():
 def test_oinfo_not_found():
     flush_channels()
 
-    msg_id = KC.inspect("dne")
+    msg_id = KC.inspect("does_not_exist")
     reply = get_reply(KC, msg_id, TIMEOUT)
     validate_message(reply, "inspect_reply", msg_id)
     content = reply["content"]
diff --git a/ipykernel/tests/test_parentpoller.py b/tests/test_parentpoller.py
similarity index 95%
rename from ipykernel/tests/test_parentpoller.py
rename to tests/test_parentpoller.py
index 22df132e7..c40a47204 100644
--- a/ipykernel/tests/test_parentpoller.py
+++ b/tests/test_parentpoller.py
@@ -20,7 +20,8 @@ def exit_mock(*args):
             poller.run()
 
     def mock_getppid():
-        raise ValueError("hi")
+        msg = "hi"
+        raise ValueError(msg)
 
     with mock.patch("os.getppid", mock_getppid), pytest.raises(ValueError):
         poller.run()
diff --git a/ipykernel/tests/test_pickleutil.py b/tests/test_pickleutil.py
similarity index 100%
rename from ipykernel/tests/test_pickleutil.py
rename to tests/test_pickleutil.py
diff --git a/ipykernel/tests/test_start_kernel.py b/tests/test_start_kernel.py
similarity index 96%
rename from ipykernel/tests/test_start_kernel.py
rename to tests/test_start_kernel.py
index b2b2d3b8c..f2a632be0 100644
--- a/ipykernel/tests/test_start_kernel.py
+++ b/tests/test_start_kernel.py
@@ -17,13 +17,13 @@ def test_ipython_start_kernel_userns():
     cmd = dedent(
         """
         from ipykernel.kernelapp import launch_new_instance
-        ns = {"tre": 123}
+        ns = {"custom": 123}
         launch_new_instance(user_ns=ns)
         """
     )
 
     with setup_kernel(cmd) as client:
-        client.inspect("tre")
+        client.inspect("custom")
         msg = client.get_shell_msg(timeout=TIMEOUT)
         content = msg["content"]
         assert content["found"]
diff --git a/ipykernel/tests/test_zmq_shell.py b/tests/test_zmq_shell.py
similarity index 100%
rename from ipykernel/tests/test_zmq_shell.py
rename to tests/test_zmq_shell.py
diff --git a/ipykernel/tests/utils.py b/tests/utils.py
similarity index 100%
rename from ipykernel/tests/utils.py
rename to tests/utils.py