Add test stub for wrong sized cluster conflicts

test/functional/mempool_package_rbf.py

@@ -93,6 +93,7 @@ def run_test(self):
         self.test_too_numerous_ancestors()
         self.test_too_numerous_pkg()
         self.test_insufficient_feerate()
+        self.test_wrong_conflict_cluster_size()
 
     def test_package_rbf_basic(self):
         self.log.info("Test that a child can pay to replace its parents' conflicts")
@@ -261,6 +262,12 @@ def test_too_numerous_ancestors(self):
         self.assert_mempool_contents(expected=package_txns1 + package_txns2_succeed, unexpected=package_txns2_fail)
         self.generate(node, 1)
 
+    def test_wrong_conflict_cluster_size(self):
+        self.log.info("Test that conflicting with a cluster not sized two is rejected")
+
+        # conflict directly against chain of 3 txns
+        # conflict against a child in a 3 gen chain
+
     def test_too_numerous_pkg(self):
         self.log.info("Test that package RBF doesn't work with packages larger than 2 due to pkg size")
         node = self.nodes[0]