diff --git a/test-requirements.txt b/test-requirements.txt
index d118997..a41a729 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,6 +3,7 @@ flask
 connexion[flask,swagger-ui]
 quart
 sanic
+sanic-testing
 fastapi
 uvicorn
 requests
diff --git a/tests/test_quart.py b/tests/test_quart.py
new file mode 100644
index 0000000..16cd959
--- /dev/null
+++ b/tests/test_quart.py
@@ -0,0 +1,108 @@
+"""Test suite for the quart backend (issue #137)."""
+import asyncio
+import json
+import logging
+
+import pytest
+import quart
+from helpers.handler import FormattedMessageCollectorHandler
+from helpers.imports import undo_imports_from_package
+
+LOGGER_NAME = "quart-test"
+REQUEST_LOGGER_NAME = "quart-request-logger"
+
+
+@pytest.fixture
+def app_and_handlers():
+    import json_logging
+    from json_logging.formatters import JSONRequestLogFormatter
+
+    app = quart.Quart(__name__)
+
+    logger = logging.getLogger(LOGGER_NAME)
+    logger.setLevel(logging.DEBUG)
+    log_handler = FormattedMessageCollectorHandler()
+    logger.addHandler(log_handler)
+
+    request_logger = logging.getLogger(REQUEST_LOGGER_NAME)
+    request_handler = FormattedMessageCollectorHandler()
+    request_handler.setFormatter(JSONRequestLogFormatter())
+
+    json_logging.init_quart(enable_json=True)
+    json_logging.init_request_instrument(app, exclude_url_patterns=["^/no-request-instrumentation"])
+    request_logger.addHandler(request_handler)
+
+    @app.route("/log")
+    async def log():
+        logger.info("info message")
+        return {}
+
+    @app.route("/get-correlation-id")
+    async def get_correlation_id():
+        return {"correlation_id": json_logging.get_correlation_id()}
+
+    @app.route("/no-request-instrumentation")
+    async def excluded():
+        return {}
+
+    yield app, log_handler, request_handler
+
+    logger.removeHandler(log_handler)
+    request_logger.removeHandler(request_handler)
+    undo_imports_from_package("json_logging")
+
+
+def _get(app, path, **kwargs):
+    async def run():
+        return await app.test_client().get(path, **kwargs)
+
+    return asyncio.run(run())
+
+
+def test_log_inside_request_has_given_correlation_id(app_and_handlers):
+    app, log_handler, _ = app_and_handlers
+
+    response = _get(app, "/log", headers={"X-Correlation-Id": "abc-def"})
+
+    assert response.status_code == 200
+    msg = json.loads(log_handler.messages[0])
+    assert msg["msg"] == "info message"
+    assert msg["correlation_id"] == "abc-def"
+
+
+def test_get_correlation_id_returns_given_header(app_and_handlers):
+    app, _, _ = app_and_handlers
+
+    response = _get(app, "/get-correlation-id", headers={"X-Correlation-Id": "abc-def"})
+
+    assert asyncio.run(response.get_json()) == {"correlation_id": "abc-def"}
+
+
+def test_request_instrumentation_writes_request_log(app_and_handlers):
+    app, _, request_handler = app_and_handlers
+
+    response = _get(app, "/log")
+
+    assert response.status_code == 200
+    assert len(request_handler.messages) == 1
+    msg = json.loads(request_handler.messages[0])
+    assert msg["method"] == "GET"
+    assert msg["request"] == "/log"
+    assert msg["response_status"] == 200
+    assert msg["type"] == "request"
+
+
+def test_excluded_url_is_not_request_logged(app_and_handlers):
+    app, _, request_handler = app_and_handlers
+
+    response = _get(app, "/no-request-instrumentation")
+
+    assert response.status_code == 200
+    assert request_handler.messages == []
+
+
+def test_init_request_instrument_rejects_non_quart_app(app_and_handlers):
+    import json_logging
+
+    with pytest.raises(RuntimeError, match="not a valid quart"):
+        json_logging.init_request_instrument(object())
diff --git a/tests/test_sanic.py b/tests/test_sanic.py
new file mode 100644
index 0000000..185e4e0
--- /dev/null
+++ b/tests/test_sanic.py
@@ -0,0 +1,99 @@
+"""Test suite for the sanic backend (issue #137)."""
+import json
+import logging
+
+import pytest
+import sanic
+import sanic.response
+from helpers.handler import FormattedMessageCollectorHandler
+from helpers.imports import undo_imports_from_package
+
+LOGGER_NAME = "sanic-test"
+REQUEST_LOGGER_NAME = "sanic-request"
+
+
+@pytest.fixture
+def app_and_handlers():
+    import json_logging
+    from json_logging.formatters import JSONRequestLogFormatter
+
+    app = sanic.Sanic("json-logging-sanic-test")
+
+    logger = logging.getLogger(LOGGER_NAME)
+    logger.setLevel(logging.DEBUG)
+    log_handler = FormattedMessageCollectorHandler()
+    logger.addHandler(log_handler)
+
+    request_logger = logging.getLogger(REQUEST_LOGGER_NAME)
+    request_handler = FormattedMessageCollectorHandler()
+    request_handler.setFormatter(JSONRequestLogFormatter())
+
+    json_logging.init_sanic(enable_json=True)
+    json_logging.init_request_instrument(app, exclude_url_patterns=["^/no-request-instrumentation"])
+    request_logger.addHandler(request_handler)
+
+    @app.route("/log")
+    async def log(request):
+        logger.info("info message")
+        return sanic.response.json({})
+
+    @app.route("/get-correlation-id")
+    async def get_correlation_id(request):
+        return sanic.response.json({"correlation_id": json_logging.get_correlation_id(request)})
+
+    @app.route("/no-request-instrumentation")
+    async def excluded(request):
+        return sanic.response.json({})
+
+    yield app, log_handler, request_handler
+
+    logger.removeHandler(log_handler)
+    request_logger.removeHandler(request_handler)
+    undo_imports_from_package("json_logging")
+    sanic.Sanic._app_registry.pop("json-logging-sanic-test", None)
+
+
+def test_get_correlation_id_returns_given_header(app_and_handlers):
+    app, _, _ = app_and_handlers
+
+    _, response = app.test_client.get("/get-correlation-id", headers={"X-Correlation-Id": "abc-def"})
+
+    assert response.json == {"correlation_id": "abc-def"}
+
+
+def test_get_correlation_id_is_generated_when_missing(app_and_handlers):
+    app, _, _ = app_and_handlers
+
+    _, response = app.test_client.get("/get-correlation-id")
+
+    assert response.json["correlation_id"] not in (None, "-", "")
+
+
+def test_request_instrumentation_writes_request_log(app_and_handlers):
+    app, _, request_handler = app_and_handlers
+
+    _, response = app.test_client.get("/log")
+
+    assert response.status == 200
+    assert len(request_handler.messages) == 1
+    msg = json.loads(request_handler.messages[0])
+    assert msg["method"] == "GET"
+    assert msg["request"] == "/log"
+    assert msg["response_status"] == 200
+    assert msg["type"] == "request"
+
+
+def test_excluded_url_is_not_request_logged(app_and_handlers):
+    app, _, request_handler = app_and_handlers
+
+    _, response = app.test_client.get("/no-request-instrumentation")
+
+    assert response.status == 200
+    assert request_handler.messages == []
+
+
+def test_init_request_instrument_rejects_non_sanic_app(app_and_handlers):
+    import json_logging
+
+    with pytest.raises(RuntimeError, match="not a valid Sanic"):
+        json_logging.init_request_instrument(object())