test: add coverage for `/deploymentinfo` passing a blockhash

test/functional/interface_rest.py

@@ -421,6 +421,10 @@ class RESTTest (BitcoinTestFramework):
         deployment_info = self.nodes[0].getdeploymentinfo()
         assert_equal(deployment_info, self.test_rest_request('/deploymentinfo'))
 
+        previous_bb_hash = self.nodes[0].getblockhash(self.nodes[0].getblockcount() - 1)
+        deployment_info = self.nodes[0].getdeploymentinfo(previous_bb_hash)
+        assert_equal(deployment_info, self.test_rest_request(f"/deploymentinfo/{previous_bb_hash}"))
+
         non_existing_blockhash = '42759cde25462784395a337460bde75f58e73d3f08bd31fdc3507cbac856a2c4'
         resp = self.test_rest_request(f'/deploymentinfo/{non_existing_blockhash}', ret_type=RetType.OBJ, status=400)
         assert_equal(resp.read().decode('utf-8').rstrip(), "Block not found")