diff --git a/tests/test_config_schema.py b/tests/test_config_schema.py
index 7654d37..8863fbf 100644
--- a/tests/test_config_schema.py
+++ b/tests/test_config_schema.py
@@ -2,144 +2,10 @@
 Unit test functions to test JSON Schema validation
 """
 
-import pytest
+import jsonschema
+from tljh.config_schema import config_schema
 
-from tljh import config
-
-
-@pytest.mark.parametrize(
-    "valid_config",
-    [
-        # Valid configuration with JupyterLab as default app and HTTPS enabled with Let's Encrypt
-        {
-            "user_environment": {"default_app": "jupyterlab"},
-            "https": {
-                "enabled": True,
-                "letsencrypt": {
-                    "email": "admin@example.com",
-                    "domains": ["example.com"],
-                },
-            },
-        },
-        # Valid configuration with classic notebook UI
-        {"user_environment": {"default_app": "classic"}, "https": {"enabled": False}},
-        # Valid configuration with culling service enabled
-        {
-            "user_environment": {"default_app": "jupyterlab"},
-            "https": {"enabled": False},
-            "services": {
-                "cull": {
-                    "enabled": True,
-                    "timeout": 3600,
-                    "every": 600,
-                    "concurrency": 5,
-                    "users": True,
-                    "max_age": 86400,
-                    "remove_named_servers": False,
-                }
-            },
-        },
-        # Valid configuration of resource limits
-        {
-            "user_environment": {"default_app": "jupyterlab"},
-            "https": {"enabled": False},
-            "limits": {"memory": "2G", "cpu": 1.5},
-        },
-        # Valid configuration with TLS certificates instead of Let's Encrypt
-        {
-            "user_environment": {"default_app": "jupyterlab"},
-            "https": {
-                "enabled": True,
-                "tls": {
-                    "key": "/etc/tljh/tls/private.key",
-                    "cert": "/etc/tljh/tls/certificate.crt",
-                },
-            },
-        },
-        # Valid configuration with TLS and custom HTTPS address/port
-        {
-            "user_environment": {"default_app": "jupyterlab"},
-            "https": {
-                "enabled": True,
-                "address": "192.168.1.1",
-                "port": 443,
-                "tls": {
-                    "key": "/etc/tljh/tls/private.key",
-                    "cert": "/etc/tljh/tls/certificate.crt",
-                },
-            },
-        },
-    ],
-)
-def test_valid_configs(valid_config):
-    """Test that known good configs pass validation without errors."""
-    try:
-        config.validate_config(valid_config, validate=True)
-    except Exception as e:
-        pytest.fail(f"Valid config failed validation: {e}")
-
-
-@pytest.mark.parametrize(
-    "invalid_config",
-    [
-        # Invalid default_app value
-        {
-            "user_environment": {"default_app": "saturnlab"},
-            "https": {
-                "enabled": True,
-                "letsencrypt": {
-                    "email": "admin@example.com",
-                    "domains": ["sub.example.com"],
-                },
-            },
-        },
-        # Invalid domains type (should be array)
-        {
-            "user_environment": {"default_app": "jupyterlab"},
-            "https": {
-                "enabled": True,
-                "letsencrypt": {"email": "not-an-email", "domains": "example.com"},
-            },
-        },
-        # Extra unexpected property
-        {
-            "user_environment": {"default_app": "jupyterlab"},
-            "https": {
-                "enabled": True,
-                "letsencrypt": {
-                    "email": "admin@example.com",
-                    "domains": ["example.com"],
-                    "extra_property": "invalid",
-                },
-            },
-        },
-        # Invalid culling service config (timeout should be an integer)
-        {
-            "user_environment": {"default_app": "jupyterlab"},
-            "https": {"enabled": False},
-            "services": {
-                "cull": {
-                    "enabled": True,
-                    "timeout": "one hour",
-                    "every": 600,
-                    "concurrency": 5,
-                    "users": True,
-                    "max_age": 86400,
-                    "remove_named_servers": False,
-                }
-            },
-        },
-        # Invalid resource limits (negative CPU value)
-        {
-            "user_environment": {"default_app": "jupyterlab"},
-            "https": {"enabled": False},
-            "limits": {"memory": "2G", "cpu": -1},
-        },
-    ],
-)
-def test_invalid_configs(invalid_config):
-    """Test that known bad configs raise validation errors."""
-    with pytest.raises(SystemExit) as exc_info:
-        config.validate_config(invalid_config, validate=True)
-
-    assert exc_info.value.code == 1
+def test_valid_config_json_schema():
+  """Validate that the JSON schema fits its $schema specification"""
+  validator_class = jsonschema.validators.validator_for(config_schema)
+  validator_class.check_schema(config_schema)