diff --git a/test/demo/broadway/conftest.py b/test/demo/broadway/conftest.py
index b4eac42..8318421 100644
--- a/test/demo/broadway/conftest.py
+++ b/test/demo/broadway/conftest.py
@@ -2,17 +2,11 @@
 import subprocess
 
 
-def pytest_runtest_setup(item):
-    print(f"pytest_runtest_setup({item}")
-
-
 def pytest_configure(config):
-    print("Configure")
     subprocess.run(["pkill", "gtk4-broadwayd"])
     subprocess.Popen(["/usr/bin/gtk4-broadwayd", ":5"])
     (pathlib.Path(__file__).parent / "results").mkdir(parents=True, exist_ok=True)
 
 
 def pytest_unconfigure(config):
-    print("Unconfigure")
     subprocess.run(["pkill", "gtk4-broadwayd"])
diff --git a/test/demo/broadway/test_broadway.py b/test/demo/broadway/test_broadway.py
index 944dd1f..a8f82cb 100644
--- a/test/demo/broadway/test_broadway.py
+++ b/test/demo/broadway/test_broadway.py
@@ -79,7 +79,7 @@ def end():
 
 
 @pytest.mark.parametrize("demo", chain(*demos.values()))
-def test_demo(demo, browser):
+def test_demo(demo, browser, capsys):
     app = DemoApplication(
         demo, browser, application_id=f"io.github.slaclau.plotly_gtk.{demo}"
     )
@@ -88,6 +88,8 @@ def test_demo(demo, browser):
     directory = (pathlib.Path(__file__).parent / "results").resolve()
     img = Image.open(directory / f"{demo}.png")
     assert np.mean(img.convert("RGB").getdata()) < 0xFF
+    out, err = capsys.readouterr()
+    assert not err
 
 if __name__ == "__main__":
     if len(sys.argv) > 1: