diff --git a/tests/test_tutorial/test_middleware/test_tutorial001.py b/tests/test_tutorial/test_middleware/test_tutorial001.py
index ec7f7ac3d..548937924 100644
--- a/tests/test_tutorial/test_middleware/test_tutorial001.py
+++ b/tests/test_tutorial/test_middleware/test_tutorial001.py
@@ -10,3 +10,8 @@ def test_add_process_time_header_middleware():
     assert response.json() == {"hello": "world"}
     assert "X-Process-Time" in response.headers
     assert len(response.headers["X-Process-Time"]) > 0
+
+    # request/response process time
+    process_time = response.headers["X-Process-Time"]
+    assert float(process_time) > 0
+
diff --git a/tests/test_tutorial/test_middleware/test_tutorial002.py b/tests/test_tutorial/test_middleware/test_tutorial002.py
index 3eaa8049c..43b2c1121 100644
--- a/tests/test_tutorial/test_middleware/test_tutorial002.py
+++ b/tests/test_tutorial/test_middleware/test_tutorial002.py
@@ -10,3 +10,6 @@ def test_add_process_time_header_middleware():
     assert response.json() == {"hello": "world"}
     assert "X-Process-Time" in response.headers
     assert len(response.headers["X-Process-Time"]) > 0
+    # request/response process time
+    process_time = response.headers["X-Process-Time"]
+    assert float(process_time) > 0