.

wcfs/internal/xbtree/xbtreetest/treegen.py

@@ -420,7 +420,7 @@ def diff(d1, d2): # -> [] of (k,v) to change; DEL means del[k]
 # diff = [] of (k,v) to change; DEL means del[k]
 def patch(d, diff, verify):
     for (k,v) in diff:
-        if v is DEL:
+        if v == DEL:
             del d[k]
         else:
             d[k] = v

wcfs/internal/zdata/δftail_test.go

@@ -133,6 +133,8 @@ func testΔFtail(t_ *testing.T, testq chan ΔFTestEntry) {
 					Zinblk[zblk] = inblk
 				}
 				inblk.Add(blk)
+			} else {
+				delete(blkTab, blk)
 			}
 
 			// update δblk due to change in blkTab
@@ -251,6 +253,9 @@ func TestΔFtail(t *testing.T) {
 		{δT{},			δD(c)},
 		{δT{2:c},		δD(a,b)},
 
+		// clear the tree
+		{δT{1:ø,2:ø},		δD()},
+
 		// i is first associated with file, but later unlinked from it
 		// then i is changed -> the file should no be in δF
 		{δT{5:i},		δD()},