diff --git a/tests/core/test_scanspecs.py b/tests/core/test_scanspecs.py
index c4e8257..4a8c8cc 100644
--- a/tests/core/test_scanspecs.py
+++ b/tests/core/test_scanspecs.py
@@ -56,3 +56,9 @@ def test_multiple_duration_frames():
         AssertionError, match=re.escape("Zipping would overwrite axes ['DURATION']")
     ):
         spec.calculate()
+    spec = (  # TODO: refactor when https://github.com/dls-controls/scanspec/issues/90
+        Static.duration(0.1) * Line.bounded(DURATION, 0, 0, 2)
+    )
+    frames = spec.calculate()
+    assert len(frames) == 2
+    assert get_constant_duration(frames) is None