Add test that exercises "too large removal buffer" code

test_conflict_set.py

@@ -1,3 +1,4 @@
+import struct
 from conflict_set import *
 
 
@@ -164,6 +165,16 @@ def test_fixup_256():
         cs.check(read(0, bytes([1]), bytes([2])))
 
 
+def test_large_removal_buffer():
+    with DebugConflictSet() as cs:
+        for i in range(1000):
+            # create extra gc work
+            for j in range(100):
+                cs.addWrites(1000 + i)
+            cs.addWrites(1000 + i, write(struct.pack(">l", i) + bytes([0] * 100000)))
+            cs.setOldestVersion(i)
+
+
 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