diff --git a/tests/test_testdata.py b/tests/test_testdata.py
index cb38bd8..e7e0d23 100644
--- a/tests/test_testdata.py
+++ b/tests/test_testdata.py
@@ -53,6 +53,17 @@ def _server(request) -> Generator[str, None, None]:
                 break
 
 
+@pytest.mark.parametrize('_server', [({
+    'keys': ['one', 'two', 'three'],
+    'max-size': '100',
+    'max-data': 1234,
+    'buffer-size': '12MiB',
+})], indirect=['_server'])
+def test_invalid_api_key(_server):
+    response = requests.get(f'{PROTOCOL}://{HOST}:{PORT}/zeros?api_key=four&size=100', timeout=TIMEOUT)
+    assert response.status_code == 401
+
+
 @pytest.mark.parametrize('_server', [({
     'keys': ['one', 'two', 'three'],
     'max-size': '100',
@@ -85,13 +96,16 @@ def test_request_size_upper_bound(_server):
 
 @pytest.mark.parametrize('_server', [({
     'keys': ['one', 'two', 'three'],
-    'max-size': '100',
-    'max-data': 1234,
+    'max-size': '100KB',
+    'max-data': '100KB',
     'buffer-size': '12MiB',
 })], indirect=['_server'])
-def test_invalid_api_key(_server):
-    response = requests.get(f'{PROTOCOL}://{HOST}:{PORT}/zeros?api_key=four&size=100', timeout=TIMEOUT)
-    assert response.status_code == 401
+def test_request_max_data_used(_server):
+    response = requests.get(f'{PROTOCOL}://{HOST}:{PORT}/zeros?api_key=one&size=100KB', timeout=TIMEOUT)
+    assert response.status_code == 200
+
+    response = requests.get(f'{PROTOCOL}://{HOST}:{PORT}/zeros?api_key=one&size=1', timeout=TIMEOUT)
+    assert response.status_code == 500
 
 
 @pytest.mark.parametrize('_server', [({