diff --git a/wizard-work/beam/_smoke_intervals.py b/wizard-work/beam/_smoke_intervals.py
new file mode 100644
index 0000000..6e08f59
--- /dev/null
+++ b/wizard-work/beam/_smoke_intervals.py
@@ -0,0 +1,13 @@
+import sys
+sys.path.insert(0, "/root/troupe-standup/wizard-work/beam")
+from intervals import merge, total_covered, find_gaps
+
+def main():
+    # smoke
+    assert merge([(1,4),(3,6),(8,10)]) == [(1,6),(8,10)]
+    assert total_covered([(1,4),(3,6)]) == 5
+    assert find_gaps([(1,3),(5,7)], 0, 8) == [(0,1),(3,5),(7,8)]
+    print("intervals smoke OK")
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file