Fix Ctrl+C and tests on Windows. (#1808)

* Fix Ctrl+C on Windows.

* Disable testing of a function N/A on Windows.

* Add test for coverage, avoid crash on missing _stopping.

* Initialise StreamingHTTPResponse.protocol = None

* Improved comments.

* Reduce amount of data in test_request_stream to avoid failures on Windows.

* The Windows test doesn't work on Windows :(

* Use port numbers more likely to be free than 8000.

* Disable the other signal tests on Windows as well.

* Windows doesn't properly support SO_REUSEADDR, so that's disabled in Python, and thus rebinding fails. For successful testing, reuse port instead.

* app.run argument handling: added server kwargs (alike create_server), added warning on extra kwargs, made auto_reload explicit argument. Another go at Windows tests

* Revert "app.run argument handling: added server kwargs (alike create_server), added warning on extra kwargs, made auto_reload explicit argument. Another go at Windows tests"

This reverts commit dc5d682448.

* Use random test server port on most tests. Should avoid port/addr reuse issues.

* Another test to random port instead of 8000.

* Fix deprecation warnings about missing name on Sanic() in tests.

* Linter and typing

* Increase test coverage

* Rewrite test for ctrlc_windows_workaround

* py36 compat

* py36 compat

* py36 compat

* Don't rely on loop internals but add a stopping flag to app.

* App may be restarted.

* py36 compat

* Linter

* Add a constant for OS checking.

Co-authored-by: L. Kärkkäinen <tronic@users.noreply.github.com>

sanic/app.py

@@ -81,6 +81,7 @@ class Sanic:
         self.sock = None
         self.strict_slashes = strict_slashes
         self.listeners = defaultdict(list)
+        self.is_stopping = False
         self.is_running = False
         self.is_request_stream = False
         self.websocket_enabled = False
@@ -1177,6 +1178,7 @@ class Sanic:
 
         try:
             self.is_running = True
+            self.is_stopping = False
             if workers > 1 and os.name != "posix":
                 logger.warn(
                     f"Multiprocessing is currently not supported on {os.name},"
@@ -1209,6 +1211,8 @@ class Sanic:
 
     def stop(self):
         """This kills the Sanic"""
+        if not self.is_stopping:
+            self.is_stopping = True
             get_event_loop().stop()
 
     async def create_server(

sanic/compat.py

@@ -1,3 +1,6 @@
+import asyncio
+import signal
+
 from sys import argv
 
 from multidict import CIMultiDict  # type: ignore
@@ -23,3 +26,27 @@ else:
 
     async def open_async(file, mode="r", **kwargs):
         return aio_open(file, mode, **kwargs)
+
+
+def ctrlc_workaround_for_windows(app):
+    async def stay_active(app):
+        """Asyncio wakeups to allow receiving SIGINT in Python"""
+        while not die:
+            # If someone else stopped the app, just exit
+            if app.is_stopping:
+                return
+            # Windows Python blocks signal handlers while the event loop is
+            # waiting for I/O. Frequent wakeups keep interrupts flowing.
+            await asyncio.sleep(0.1)
+        # Can't be called from signal handler, so call it from here
+        app.stop()
+
+    def ctrlc_handler(sig, frame):
+        nonlocal die
+        if die:
+            raise KeyboardInterrupt("Non-graceful Ctrl+C")
+        die = True
+
+    die = False
+    signal.signal(signal.SIGINT, ctrlc_handler)
+    app.add_task(stay_active)

sanic/response.py

@@ -91,6 +91,7 @@ class StreamingHTTPResponse(BaseHTTPResponse):
         self.headers = Header(headers or {})
         self.chunked = chunked
         self._cookies = None
+        self.protocol = None
 
     async def write(self, data):
         """Writes a chunk of data to the streaming response.

sanic/server.py

@@ -15,7 +15,7 @@ from time import time
 from httptools import HttpRequestParser  # type: ignore
 from httptools.parser.errors import HttpParserError  # type: ignore
 
-from sanic.compat import Header
+from sanic.compat import Header, ctrlc_workaround_for_windows
 from sanic.exceptions import (
     HeaderExpectationFailed,
     InvalidUsage,
@@ -37,6 +37,8 @@ try:
 except ImportError:
     pass
 
+OS_IS_WINDOWS = os.name == "nt"
+
 
 class Signal:
     stopped = False
@@ -929,15 +931,11 @@ def serve(
 
     # Register signals for graceful termination
     if register_sys_signals:
-        _singals = (SIGTERM,) if run_multiple else (SIGINT, SIGTERM)
+        if OS_IS_WINDOWS:
-        for _signal in _singals:
+            ctrlc_workaround_for_windows(app)
-            try:
+        else:
-                loop.add_signal_handler(_signal, loop.stop)
+            for _signal in [SIGTERM] if run_multiple else [SIGINT, SIGTERM]:
-            except NotImplementedError:
+                loop.add_signal_handler(_signal, app.stop)
-                logger.warning(
-                    "Sanic tried to use loop.add_signal_handler "
-                    "but it is not implemented on this platform."
-                )
     pid = os.getpid()
     try:
         logger.info("Starting worker [%s]", pid)

sanic/testing.py

@@ -12,7 +12,7 @@ from sanic.response import text
 
 ASGI_HOST = "mockserver"
 HOST = "127.0.0.1"
-PORT = 42101
+PORT = None
 
 
 class SanicTestClient:
@@ -95,7 +95,7 @@ class SanicTestClient:
 
         if self.port:
             server_kwargs = dict(
-                host=host or self.host, port=self.port, **server_kwargs
+                host=host or self.host, port=self.port, **server_kwargs,
             )
             host, port = host or self.host, self.port
         else:
@@ -103,6 +103,7 @@ class SanicTestClient:
             sock.bind((host or self.host, 0))
             server_kwargs = dict(sock=sock, **server_kwargs)
             host, port = sock.getsockname()
+            self.port = port
 
         if uri.startswith(
             ("http:", "https:", "ftp:", "ftps://", "//", "ws:", "wss:")
@@ -114,6 +115,9 @@ class SanicTestClient:
             url = "{scheme}://{host}:{port}{uri}".format(
                 scheme=scheme, host=host, port=port, uri=uri
             )
+        # Tests construct URLs using PORT = None, which means random port not
+        # known until this function is called, so fix that here
+        url = url.replace(":None/", f":{port}/")
 
         @self.app.listener("after_server_start")
         async def _collect_response(sanic, loop):
@@ -203,7 +207,7 @@ class SanicASGITestClient(httpx.AsyncClient):
 
         self.app = app
 
-        dispatch = SanicASGIDispatch(app=app, client=(ASGI_HOST, PORT))
+        dispatch = SanicASGIDispatch(app=app, client=(ASGI_HOST, PORT or 0))
         super().__init__(dispatch=dispatch, base_url=base_url)
 
         self.last_request = None

tests/test_app.py

@@ -6,6 +6,7 @@ from inspect import isawaitable
 
 import pytest
 
+from sanic import Sanic
 from sanic.exceptions import SanicException
 from sanic.response import text
 
@@ -48,6 +49,7 @@ def test_asyncio_server_no_start_serving(app):
     if not uvloop_installed():
         loop = asyncio.get_event_loop()
         asyncio_srv_coro = app.create_server(
+            port=43123,
             return_asyncio_server=True,
             asyncio_server_kwargs=dict(start_serving=False),
         )
@@ -61,6 +63,7 @@ def test_asyncio_server_start_serving(app):
     if not uvloop_installed():
         loop = asyncio.get_event_loop()
         asyncio_srv_coro = app.create_server(
+            port=43124,
             return_asyncio_server=True,
             asyncio_server_kwargs=dict(start_serving=False),
         )
@@ -199,10 +202,17 @@ def test_handle_request_with_nested_sanic_exception(app, monkeypatch, caplog):
 
     with caplog.at_level(logging.ERROR):
         request, response = app.test_client.get("/")
+    port = request.server_port
+    assert port > 0
     assert response.status == 500
     assert "Mock SanicException" in response.text
     assert (
         "sanic.root",
         logging.ERROR,
-        "Exception occurred while handling uri: 'http://127.0.0.1:42101/'",
+        f"Exception occurred while handling uri: 'http://127.0.0.1:{port}/'",
     ) in caplog.record_tuples
+
+
+def test_app_name_required():
+    with pytest.deprecated_call():
+        Sanic()

tests/test_asgi.py

@@ -221,7 +221,7 @@ async def test_request_class_custom():
     class MyCustomRequest(Request):
         pass
 
-    app = Sanic(request_class=MyCustomRequest)
+    app = Sanic(name=__name__, request_class=MyCustomRequest)
 
     @app.get("/custom")
     def custom_request(request):

tests/test_config.py

@@ -44,42 +44,42 @@ def test_load_from_object_string_exception(app):
 
 def test_auto_load_env():
     environ["SANIC_TEST_ANSWER"] = "42"
-    app = Sanic()
+    app = Sanic(name=__name__)
     assert app.config.TEST_ANSWER == 42
     del environ["SANIC_TEST_ANSWER"]
 
 
 def test_auto_load_bool_env():
     environ["SANIC_TEST_ANSWER"] = "True"
-    app = Sanic()
+    app = Sanic(name=__name__)
     assert app.config.TEST_ANSWER == True
     del environ["SANIC_TEST_ANSWER"]
 
 
 def test_dont_load_env():
     environ["SANIC_TEST_ANSWER"] = "42"
-    app = Sanic(load_env=False)
+    app = Sanic(name=__name__, load_env=False)
     assert getattr(app.config, "TEST_ANSWER", None) is None
     del environ["SANIC_TEST_ANSWER"]
 
 
 def test_load_env_prefix():
     environ["MYAPP_TEST_ANSWER"] = "42"
-    app = Sanic(load_env="MYAPP_")
+    app = Sanic(name=__name__, load_env="MYAPP_")
     assert app.config.TEST_ANSWER == 42
     del environ["MYAPP_TEST_ANSWER"]
 
 
 def test_load_env_prefix_float_values():
     environ["MYAPP_TEST_ROI"] = "2.3"
-    app = Sanic(load_env="MYAPP_")
+    app = Sanic(name=__name__, load_env="MYAPP_")
     assert app.config.TEST_ROI == 2.3
     del environ["MYAPP_TEST_ROI"]
 
 
 def test_load_env_prefix_string_value():
     environ["MYAPP_TEST_TOKEN"] = "somerandomtesttoken"
-    app = Sanic(load_env="MYAPP_")
+    app = Sanic(name=__name__, load_env="MYAPP_")
     assert app.config.TEST_TOKEN == "somerandomtesttoken"
     del environ["MYAPP_TEST_TOKEN"]
 

tests/test_custom_request.py

@@ -20,7 +20,7 @@ class CustomRequest(Request):
 
 
 def test_custom_request():
-    app = Sanic(request_class=CustomRequest)
+    app = Sanic(name=__name__, request_class=CustomRequest)
 
     @app.route("/post", methods=["POST"])
     async def post_handler(request):

tests/test_keep_alive_timeout.py

@@ -7,12 +7,12 @@ import httpx
 
 from sanic import Sanic, server
 from sanic.response import text
-from sanic.testing import HOST, PORT, SanicTestClient
+from sanic.testing import HOST, SanicTestClient
-
 
 CONFIG_FOR_TESTS = {"KEEP_ALIVE_TIMEOUT": 2, "KEEP_ALIVE": True}
 
 old_conn = None
+PORT = 42101  # test_keep_alive_timeout_reuse doesn't work with random port
 
 
 class ReusableSanicConnectionPool(

tests/test_logging.py

@@ -1,4 +1,5 @@
 import logging
+import os
 import uuid
 
 from importlib import reload
@@ -12,6 +13,7 @@ import sanic
 from sanic import Sanic
 from sanic.log import LOGGING_CONFIG_DEFAULTS, logger
 from sanic.response import text
+from sanic.testing import SanicTestClient
 
 
 logging_format = """module: %(module)s; \
@@ -127,7 +129,7 @@ def test_log_connection_lost(app, debug, monkeypatch):
 def test_logger(caplog):
     rand_string = str(uuid.uuid4())
 
-    app = Sanic()
+    app = Sanic(name=__name__)
 
     @app.get("/")
     def log_info(request):
@@ -137,15 +139,67 @@ def test_logger(caplog):
     with caplog.at_level(logging.INFO):
         request, response = app.test_client.get("/")
 
+    port = request.server_port
+
+    # Note: testing with random port doesn't show the banner because it doesn't
+    # define host and port. This test supports both modes.
+    if caplog.record_tuples[0] == (
+        "sanic.root",
+        logging.INFO,
+        f"Goin' Fast @ http://127.0.0.1:{port}",
+    ):
+        caplog.record_tuples.pop(0)
+
     assert caplog.record_tuples[0] == (
         "sanic.root",
         logging.INFO,
-        "Goin' Fast @ http://127.0.0.1:42101",
+        f"http://127.0.0.1:{port}/",
+    )
+    assert caplog.record_tuples[1] == ("sanic.root", logging.INFO, rand_string)
+    assert caplog.record_tuples[-1] == (
+        "sanic.root",
+        logging.INFO,
+        "Server Stopped",
+    )
+
+
+def test_logger_static_and_secure(caplog):
+    # Same as test_logger, except for more coverage:
+    # - test_client initialised separately for static port
+    # - using ssl
+    rand_string = str(uuid.uuid4())
+
+    app = Sanic(name=__name__)
+
+    @app.get("/")
+    def log_info(request):
+        logger.info(rand_string)
+        return text("hello")
+
+    current_dir = os.path.dirname(os.path.realpath(__file__))
+    ssl_cert = os.path.join(current_dir, "certs/selfsigned.cert")
+    ssl_key = os.path.join(current_dir, "certs/selfsigned.key")
+
+    ssl_dict = {"cert": ssl_cert, "key": ssl_key}
+
+    test_client = SanicTestClient(app, port=42101)
+    with caplog.at_level(logging.INFO):
+        request, response = test_client.get(
+            f"https://127.0.0.1:{test_client.port}/",
+            server_kwargs=dict(ssl=ssl_dict),
+        )
+
+    port = test_client.port
+
+    assert caplog.record_tuples[0] == (
+        "sanic.root",
+        logging.INFO,
+        f"Goin' Fast @ https://127.0.0.1:{port}",
     )
     assert caplog.record_tuples[1] == (
         "sanic.root",
         logging.INFO,
-        "http://127.0.0.1:42101/",
+        f"https://127.0.0.1:{port}/",
     )
     assert caplog.record_tuples[2] == ("sanic.root", logging.INFO, rand_string)
     assert caplog.record_tuples[-1] == (

tests/test_logo.py

@@ -49,10 +49,10 @@ def test_logo_false(app, caplog):
     loop.run_until_complete(_server.wait_closed())
     app.stop()
 
+    banner, port = caplog.record_tuples[ROW][2].rsplit(":", 1)
     assert caplog.record_tuples[ROW][1] == logging.INFO
-    assert caplog.record_tuples[ROW][
+    assert banner == "Goin' Fast @ http://127.0.0.1"
-        2
+    assert int(port) > 0
-    ] == f"Goin' Fast @ http://127.0.0.1:{PORT}"
 
 
 def test_logo_true(app, caplog):

tests/test_request_stream.py

@@ -8,7 +8,7 @@ from sanic.views import CompositionView, HTTPMethodView
 from sanic.views import stream as stream_decorator
 
 
-data = "abc" * 10000000
+data = "abc" * 1_000_000
 
 
 def test_request_stream_method_view(app):

tests/test_requests.py

@@ -12,7 +12,7 @@ from sanic import Blueprint, Sanic
 from sanic.exceptions import ServerError
 from sanic.request import DEFAULT_HTTP_CONTENT_TYPE, Request, RequestParameters
 from sanic.response import html, json, text
-from sanic.testing import ASGI_HOST, HOST, PORT
+from sanic.testing import ASGI_HOST, HOST, PORT, SanicTestClient
 
 
 # ------------------------------------------------------------ #
@@ -1029,7 +1029,7 @@ def test_url_attributes_no_ssl(app, path, query, expected_url):
     app.add_route(handler, path)
 
     request, response = app.test_client.get(path + f"?{query}")
-    assert request.url == expected_url.format(HOST, PORT)
+    assert request.url == expected_url.format(HOST, request.server_port)
 
     parsed = urlparse(request.url)
 
@@ -1086,11 +1086,12 @@ def test_url_attributes_with_ssl_context(app, path, query, expected_url):
 
     app.add_route(handler, path)
 
+    port = app.test_client.port
     request, response = app.test_client.get(
         f"https://{HOST}:{PORT}" + path + f"?{query}",
         server_kwargs={"ssl": context},
     )
-    assert request.url == expected_url.format(HOST, PORT)
+    assert request.url == expected_url.format(HOST, request.server_port)
 
     parsed = urlparse(request.url)
 
@@ -1125,7 +1126,7 @@ def test_url_attributes_with_ssl_dict(app, path, query, expected_url):
         f"https://{HOST}:{PORT}" + path + f"?{query}",
         server_kwargs={"ssl": ssl_dict},
     )
-    assert request.url == expected_url.format(HOST, PORT)
+    assert request.url == expected_url.format(HOST, request.server_port)
 
     parsed = urlparse(request.url)
 
@@ -1917,8 +1918,9 @@ def test_request_server_port(app):
     def handler(request):
         return text("OK")
 
-    request, response = app.test_client.get("/", headers={"Host": "my-server"})
+    test_client = SanicTestClient(app)
-    assert request.server_port == app.test_client.port
+    request, response = test_client.get("/", headers={"Host": "my-server"})
+    assert request.server_port == test_client.port
 
 
 def test_request_server_port_in_host_header(app):
@@ -1939,6 +1941,9 @@ def test_request_server_port_in_host_header(app):
     request, response = app.test_client.get(
         "/", headers={"Host": "mal_formed:5555"}
     )
+    if PORT is None:
+        assert request.server_port != 5555
+    else:
         assert request.server_port == app.test_client.port
 
 
@@ -1979,7 +1984,7 @@ def test_server_name_and_url_for(app):
     request, response = app.test_client.get("/foo")
     assert (
         request.url_for("handler")
-        == f"http://my-server:{app.test_client.port}/foo"
+        == f"http://my-server:{request.server_port}/foo"
     )
 
     app.config.SERVER_NAME = "https://my-server/path"
@@ -2040,7 +2045,7 @@ async def test_request_form_invalid_content_type_asgi(app):
 
 
 def test_endpoint_basic():
-    app = Sanic()
+    app = Sanic(name=__name__)
 
     @app.route("/")
     def my_unique_handler(request):
@@ -2053,7 +2058,7 @@ def test_endpoint_basic():
 
 @pytest.mark.asyncio
 async def test_endpoint_basic_asgi():
-    app = Sanic()
+    app = Sanic(name=__name__)
 
     @app.route("/")
     def my_unique_handler(request):
@@ -2132,5 +2137,5 @@ def test_url_for_without_server_name(app):
     request, response = app.test_client.get("/sample")
     assert (
         response.json["url"]
-        == f"http://127.0.0.1:{app.test_client.port}/url-for"
+        == f"http://127.0.0.1:{request.server_port}/url-for"
     )

tests/test_routes.py

@@ -6,6 +6,7 @@ from sanic import Sanic
 from sanic.constants import HTTP_METHODS
 from sanic.response import json, text
 from sanic.router import ParameterNameConflicts, RouteDoesNotExist, RouteExists
+from sanic.testing import SanicTestClient
 
 
 # ------------------------------------------------------------ #
@@ -167,35 +168,36 @@ def test_route_optional_slash(app):
 def test_route_strict_slashes_set_to_false_and_host_is_a_list(app):
     # Part of regression test for issue #1120
 
-    site1 = f"127.0.0.1:{app.test_client.port}"
+    test_client = SanicTestClient(app, port=42101)
+    site1 = f"127.0.0.1:{test_client.port}"
 
     # before fix, this raises a RouteExists error
     @app.get("/get", host=[site1, "site2.com"], strict_slashes=False)
     def get_handler(request):
         return text("OK")
 
-    request, response = app.test_client.get("http://" + site1 + "/get")
+    request, response = test_client.get("http://" + site1 + "/get")
     assert response.text == "OK"
 
     @app.post("/post", host=[site1, "site2.com"], strict_slashes=False)
     def post_handler(request):
         return text("OK")
 
-    request, response = app.test_client.post("http://" + site1 + "/post")
+    request, response = test_client.post("http://" + site1 + "/post")
     assert response.text == "OK"
 
     @app.put("/put", host=[site1, "site2.com"], strict_slashes=False)
     def put_handler(request):
         return text("OK")
 
-    request, response = app.test_client.put("http://" + site1 + "/put")
+    request, response = test_client.put("http://" + site1 + "/put")
     assert response.text == "OK"
 
     @app.delete("/delete", host=[site1, "site2.com"], strict_slashes=False)
     def delete_handler(request):
         return text("OK")
 
-    request, response = app.test_client.delete("http://" + site1 + "/delete")
+    request, response = test_client.delete("http://" + site1 + "/delete")
     assert response.text == "OK"
 
 

tests/test_server_events.py

@@ -1,6 +1,9 @@
 import asyncio
 import signal
 
+from contextlib import closing
+from socket import socket
+
 import pytest
 
 from sanic.testing import HOST, PORT
@@ -118,7 +121,12 @@ def test_create_server_trigger_events(app):
     app.listener("after_server_stop")(after_stop)
 
     loop = asyncio.get_event_loop()
-    serv_coro = app.create_server(return_asyncio_server=True)
+
+    # Use random port for tests
+    with closing(socket()) as sock:
+        sock.bind(("127.0.0.1", 0))
+
+        serv_coro = app.create_server(return_asyncio_server=True, sock=sock)
         serv_task = asyncio.ensure_future(serv_coro, loop=loop)
         server = loop.run_until_complete(serv_task)
         server.after_start()

tests/test_signal_handlers.py

@@ -1,8 +1,13 @@
 import asyncio
+import os
+import signal
 
 from queue import Queue
 from unittest.mock import MagicMock
 
+import pytest
+
+from sanic.compat import ctrlc_workaround_for_windows
 from sanic.response import HTTPResponse
 from sanic.testing import HOST, PORT
 
@@ -16,13 +21,21 @@ calledq = Queue()
 
 
 def set_loop(app, loop):
-    loop.add_signal_handler = MagicMock()
+    global mock
+    mock = MagicMock()
+    if os.name == "nt":
+        signal.signal = mock
+    else:
+        loop.add_signal_handler = mock
 
 
 def after(app, loop):
-    calledq.put(loop.add_signal_handler.called)
+    calledq.put(mock.called)
 
 
+@pytest.mark.skipif(
+    os.name == "nt", reason="May hang CI on py38/windows"
+)
 def test_register_system_signals(app):
     """Test if sanic register system signals"""
 
@@ -38,6 +51,9 @@ def test_register_system_signals(app):
     assert calledq.get() is True
 
 
+@pytest.mark.skipif(
+    os.name == "nt", reason="May hang CI on py38/windows"
+)
 def test_dont_register_system_signals(app):
     """Test if sanic don't register system signals"""
 
@@ -51,3 +67,49 @@ def test_dont_register_system_signals(app):
 
     app.run(HOST, PORT, register_sys_signals=False)
     assert calledq.get() is False
+
+
+@pytest.mark.skipif(
+    os.name == "nt", reason="windows cannot SIGINT processes"
+)
+def test_windows_workaround():
+    """Test Windows workaround (on any other OS)"""
+    # At least some code coverage, even though this test doesn't work on
+    # Windows...
+    class MockApp:
+        def __init__(self):
+            self.is_stopping = False
+
+        def stop(self):
+            assert not self.is_stopping
+            self.is_stopping = True
+
+        def add_task(self, func):
+            loop = asyncio.get_event_loop()
+            self.stay_active_task = loop.create_task(func(self))
+
+    async def atest(stop_first):
+        app = MockApp()
+        ctrlc_workaround_for_windows(app)
+        await asyncio.sleep(0.05)
+        if stop_first:
+            app.stop()
+            await asyncio.sleep(0.2)
+        assert app.is_stopping == stop_first
+        # First Ctrl+C: should call app.stop() within 0.1 seconds
+        os.kill(os.getpid(), signal.SIGINT)
+        await asyncio.sleep(0.2)
+        assert app.is_stopping
+        assert app.stay_active_task.result() == None
+        # Second Ctrl+C should raise
+        with pytest.raises(KeyboardInterrupt):
+            os.kill(os.getpid(), signal.SIGINT)
+        return "OK"
+
+    # Run in our private loop
+    loop = asyncio.new_event_loop()
+    asyncio.set_event_loop(loop)
+    res = loop.run_until_complete(atest(False))
+    assert res == "OK"
+    res = loop.run_until_complete(atest(True))
+    assert res == "OK"

tests/test_test_client_port.py

@@ -27,7 +27,8 @@ def test_test_client_port_default(app):
         return json(request.transport.get_extra_info("sockname")[1])
 
     test_client = SanicTestClient(app)
-    assert test_client.port == PORT
+    assert test_client.port == PORT  # Can be None before request
 
     request, response = test_client.get("/get")
-    assert response.json == PORT
+    assert test_client.port > 0
+    assert response.json == test_client.port