Shorter block times rpc test

qa/pull-tester/rpc-tests.sh

@@ -73,6 +73,7 @@ testScripts=(
     'p2p_node_bloom.py'
     'regtest_signrawtransaction.py'
     'finalsaplingroot.py'
+    'shorter_block_times.py'
     'sprout_sapling_migration.py'
     'turnstile.py'
 );

qa/rpc-tests/shorter_block_times.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+# Copyright (c) 2019 The Zcash developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import (
+    assert_equal,
+    initialize_chain_clean,
+    start_nodes,
+)
+
+
+class ShorterBlockTimes(BitcoinTestFramework):
+    def setup_nodes(self):
+        return start_nodes(4, self.options.tmpdir, [[
+            '-nuparams=5ba81b19:0', # Overwinter
+            '-nuparams=76b809bb:0', # Sapling
+            '-nuparams=2bb40e60:101', # Blossom
+        ]] * 4)
+
+    def setup_chain(self):
+        print("Initializing test directory " + self.options.tmpdir)
+        initialize_chain_clean(self.options.tmpdir, 4)
+
+    def run_test(self):
+        print "Mining blocks..."
+        self.nodes[0].generate(100)
+        self.sync_all()
+
+        # Sanity-check the block height
+        assert_equal(self.nodes[0].getblockcount(), 100)
+
+        print "Mining last pre-Blossom block"
+        # Activate blossom
+        self.nodes[1].generate(1)
+        self.sync_all()
+        assert_equal(10, self.nodes[1].getwalletinfo()['immature_balance'])
+
+        # After blossom activation the block reward will be halved
+        print "Mining first Blossom block"
+        self.nodes[1].generate(1)
+        self.sync_all()
+        assert_equal(15, self.nodes[1].getwalletinfo()['immature_balance'])
+
+
+if __name__ == '__main__':
+    ShorterBlockTimes().main()