.

wcfs/internal/xbtree.py

@@ -198,7 +198,7 @@ def Restructure(ztree, newStructure):
     tstruct = StructureOf(ztree)
     if tstruct != newStructure:
         panic("BUG: Restructure: result structure is not what was"
-              "requested:\n%s\n\nwant:\n%s" % (tstruct, newStructure))
+              " requested:\n%s\n\nwant:\n%s" % (tstruct, newStructure))
     print()
     print(newStructure)
     print()

wcfs/internal/xbtree_test.py

@@ -367,6 +367,13 @@ def test_restructure():
     # ø -> T/T-T/B-B
     z = Z0()
     R(z, 'T0/T-T/B-B')
+    kind, keys, kids = crack_btree(z)
+    assert kind, keys == (BTREE_NORMAL, 0)
+    assert len(kids)  == 2
+    assert isinstance(kids[0], XLOTree)
+    assert isinstance(kids[1], XLOTree)
+    assert crack_btree(kids[0]) == (BTREE_EMPTY, [], [])
+    assert crack_btree(kids[1]) == (BTREE_EMPTY, [], [])
 
 
     # tree with one not-yet committed bucket