Fix prioritisetransaction RPC test

Part of #1884.

qa/rpc-tests/prioritisetransaction.py

@@ -81,17 +81,39 @@ class PrioritiseTransactionTest (BitcoinTestFramework):
 
         priority_result = self.nodes[0].prioritisetransaction(priority_tx_0, 1000, int(3 * base_fee * COIN))
 
-        # Check that prioritized transaction is in getblocktemplate()
+        # Check that prioritized transaction is not in getblocktemplate()
+        # (not updated because no new txns)
+        in_block_template = False
+        block_template = self.nodes[0].getblocktemplate()
+        for tx in block_template['transactions']:
+            if tx['hash'] == priority_tx_0:
+                in_block_template = True
+                break
+        assert_equal(in_block_template, False)
+
+        self.nodes[0].sendtoaddress(self.nodes[1].getnewaddress(), 0.1)
+
+        # Check that prioritized transaction is not in getblocktemplate()
+        # (too soon)
         in_block_template = False
         block_template = self.nodes[0].getblocktemplate()
         for tx in block_template['transactions']:
             if tx['hash'] == priority_tx_0:
                 in_block_template = True
                 break
-        # NOTE: getblocktemplate() should return prioritized transaction, but is not
-        # Noted by user in issue #1884
         assert_equal(in_block_template, False)
 
+        sleep(10)
+
+        # Check that prioritized transaction is in getblocktemplate()
+        in_block_template = False
+        block_template = self.nodes[0].getblocktemplate()
+        for tx in block_template['transactions']:
+            if tx['hash'] == priority_tx_0:
+                in_block_template = True
+                break
+        assert_equal(in_block_template, True)
+
         # Node 1 doesn't get the next block, so this *shouldn't* be mined despite being prioritized on node 1
         priority_tx_1 = self.nodes[1].sendtoaddress(self.nodes[0].getnewaddress(), 0.1)
         self.nodes[1].prioritisetransaction(priority_tx_1, 1000, int(3 * base_fee * COIN))