Account for every uncovered line in the implementation

Closes #23

test_conflict_set.py

@@ -92,6 +92,14 @@ def test_large():
         )
 
 
+def test_merge_child_node48():
+    with DebugConflictSet() as cs:
+        cs.addWrites(1, write(b"\x00" * 9))
+        for i in range(17):
+            cs.addWrites(1, write(b"\x00" * 10 + bytes([i])))
+        cs.addWrites(1, write(b"\x00" * 8, b"\x00" * 10))
+
+
 if __name__ == "__main__":
     # budget "pytest" for ctest integration without pulling in a dependency. You can of course still use pytest in local development.
     import argparse