diff --git a/test/functional/mining_prioritisetransaction.py b/test/functional/mining_prioritisetransaction.py
--- a/test/functional/mining_prioritisetransaction.py
+++ b/test/functional/mining_prioritisetransaction.py
@@ -27,6 +27,59 @@
         self.skip_if_no_wallet()
 
     def run_test(self):
+        # Test `prioritisetransaction` required parameters
+        assert_raises_rpc_error(-1,
+                                "prioritisetransaction",
+                                self.nodes[0].prioritisetransaction)
+        assert_raises_rpc_error(-1,
+                                "prioritisetransaction",
+                                self.nodes[0].prioritisetransaction,
+                                '')
+        assert_raises_rpc_error(-1,
+                                "prioritisetransaction",
+                                self.nodes[0].prioritisetransaction,
+                                '',
+                                0)
+
+        # Test `prioritisetransaction` invalid extra parameters
+        assert_raises_rpc_error(-1,
+                                "prioritisetransaction",
+                                self.nodes[0].prioritisetransaction,
+                                '',
+                                0,
+                                0,
+                                0)
+
+        # Test `prioritisetransaction` invalid `txid`
+        assert_raises_rpc_error(-1,
+                                "txid must be hexadecimal string",
+                                self.nodes[0].prioritisetransaction,
+                                txid='foo',
+                                fee_delta=0)
+
+        # Test `prioritisetransaction` invalid `dummy`
+        txid = '1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000'
+        assert_raises_rpc_error(-1,
+                                "JSON value is not a number as expected",
+                                self.nodes[0].prioritisetransaction,
+                                txid,
+                                'foo',
+                                0)
+        assert_raises_rpc_error(
+            -8,
+            "Priority is no longer supported, dummy argument to prioritisetransaction must be 0.",
+            self.nodes[0].prioritisetransaction,
+            txid,
+            1,
+            0)
+
+        # Test `prioritisetransaction` invalid `fee_delta`
+        assert_raises_rpc_error(-1,
+                                "JSON value is not an integer as expected",
+                                self.nodes[0].prioritisetransaction,
+                                txid=txid,
+                                fee_delta='foo')
+
         self.relayfee = self.nodes[0].getnetworkinfo()['relayfee']
 
         utxo_count = 90