test: check that 599 seconds is not enough

Author: UdjinM6

test/functional/p2p_instantsend.py

@@ -58,7 +58,11 @@ def test_block_doublespend(self):
         # send doublespend transaction to isolated node
         dblspnd_txid = isolated.sendrawtransaction(dblspnd_tx['hex'])
         # generate block on isolated node with doublespend transaction
-        self.bump_mocktime(600)
+        self.bump_mocktime(599)
+        wrong_early_block = isolated.generate(1)[0]
+        assert not "confirmation" in isolated.getrawtransaction(dblspnd_txid, 1)
+        isolated.invalidateblock(wrong_early_block)
+        self.bump_mocktime(1)
         wrong_block = isolated.generate(1)[0]
         assert_equal(isolated.getrawtransaction(dblspnd_txid, 1)["confirmations"], 1)
         # connect isolated block to network