Tests: Add test for getnetworkhashps

test/functional/blockchain.py

@@ -10,6 +10,7 @@ Test the following RPCs:
     - getbestblockhash
     - getblockhash
     - getblockheader
+    - getnetworkhashps
     - verifychain
 
 Tests correspond to code in rpc/blockchain.cpp.
@@ -45,6 +46,7 @@ class BlockchainTest(BitcoinTestFramework):
         self._test_gettxoutsetinfo()
         self._test_getblockheader()
         self._test_getdifficulty()
+        self._test_getnetworkhashps()
         self.nodes[0].verifychain(4, 0)
 
     def _test_gettxoutsetinfo(self):
@@ -91,5 +93,10 @@ class BlockchainTest(BitcoinTestFramework):
         # binary => decimal => binary math is why we do this check
         assert abs(difficulty * 2**31 - 1) < 0.0001
 
+    def _test_getnetworkhashps(self):
+        hashes_per_second = self.nodes[0].getnetworkhashps()
+        # This should be 2 hashes every 10 minutes or 1/300
+        assert abs(hashes_per_second * 300 - 1) < 0.0001
+
 if __name__ == '__main__':
     BlockchainTest().main()