test: assert block times increasing

Co-authored-by: Brice Dobry <[email protected]>

Author: kantai

testnet/stacks-node/src/tests/nakamoto_integrations.rs

@@ -2271,16 +2271,18 @@ fn correct_burn_outs() {
         "Blocks should be sorted by cycle number already"
     );
 
-    let block_times: Vec<u64> = new_blocks_with_reward_set
-        .iter()
-        .filter_map(|block| block.get("block_time").and_then(|cn| cn.as_u64()))
-        .collect();
-    // Assert that block_times are all greater than 0
-    assert!(block_times.iter().all(|&t| t > 0));
-
+    let mut last_block_time = None;
     for block in new_blocks_with_reward_set.iter() {
         let cycle_number = block["cycle_number"].as_u64().unwrap();
         let reward_set = block["reward_set"].as_object().unwrap();
+        if let Some(block_time) = block["block_time"].as_u64() {
+            if let Some(last) = last_block_time {
+                assert!(block_time > last, "Block times should be increasing");
+            }
+            last_block_time = Some(block_time);
+        }
+        let cycle_number = block["cycle_number"].as_u64().unwrap();
+        let reward_set = block["reward_set"].as_object().unwrap();
 
         if cycle_number < first_epoch_3_cycle {
             assert!(