diff --git a/test/src/specs/mining/fee.rs b/test/src/specs/mining/fee.rs
index baca852658..42c540ebf4 100644
--- a/test/src/specs/mining/fee.rs
+++ b/test/src/specs/mining/fee.rs
@@ -1,6 +1,6 @@
 use crate::utils::generate_utxo_set;
 use crate::{Net, Node, Spec};
-use ckb_types::core::{BlockNumber, BlockView, Capacity, TransactionView};
+use ckb_types::core::{BlockView, Capacity, TransactionView};
 use ckb_types::packed::{Byte32, OutPoint};
 use ckb_types::prelude::Entity;
 use ckb_types::prelude::*;
@@ -32,9 +32,11 @@ impl Spec for FeeOfTransaction {
         let number_to_propose = number_to_submit + 1;
         let number_to_commit = number_to_propose + closest;
         node.generate_blocks(2 * finalization_delay_length as usize);
-        assert_block(node, number_to_propose, &txs, &[]);
-        assert_block(node, number_to_commit, &[], &txs);
-        assert_chain(node, &txs);
+        assert_proposals(&node.get_block_by_number(number_to_propose), &txs);
+        assert_committed(&node.get_block_by_number(number_to_commit), &txs);
+
+        assert_transactions_committed(node, &txs);
+        assert_chain_rewards(node);
     }
 }
 
@@ -61,8 +63,10 @@ impl Spec for FeeOfMaxBlockProposalsLimit {
         let number_to_submit = node.get_tip_block_number();
         let number_to_propose = number_to_submit + 1;
         node.generate_blocks(2 * finalization_delay_length as usize);
-        assert_block(node, number_to_propose, &txs, &[]);
-        assert_chain(node, &txs);
+        assert_proposals(&node.get_block_by_number(number_to_propose), &txs);
+
+        assert_transactions_committed(node, &txs);
+        assert_chain_rewards(node);
     }
 }
 
@@ -98,7 +102,8 @@ impl Spec for FeeOfMultipleMaxBlockProposalsLimit {
         });
 
         node.generate_blocks(2 * finalization_delay_length as usize);
-        assert_chain(node, &txs);
+        assert_transactions_committed(node, &txs);
+        assert_chain_rewards(node);
     }
 }
 
@@ -114,7 +119,10 @@ impl Spec for ProposeButNotCommit {
         let target_node = &net.nodes[0];
         let feed_node = &net.nodes[1];
 
-        // Construct a chain which proposed the target transaction in the tip block
+        // We use `feed_node` to construct a chain proposed `txs` in the tip block.
+        //
+        // The returned `feed_blocks`, which represents the main fork of
+        // `feed_node`, only proposes `txs` in the last block and never commit
         let feed_blocks: Vec<_> = {
             let txs = generate_utxo_set(feed_node, 1)
                 .bang_random_fee(vec![feed_node.always_success_cell_dep()]);
@@ -126,14 +134,17 @@ impl Spec for ProposeButNotCommit {
                 .collect()
         };
 
+        // `target_node` propose `tx`
         feed_blocks.iter().for_each(|block| {
             target_node.submit_block(&block.data());
         });
 
+        // `target_node` keeps growing, but it will never commit `tx` since its transactions_pool
+        // have not `tx`.
         let finalization_delay_length = feed_node.consensus().finalization_delay_length();
         target_node.generate_blocks(2 * finalization_delay_length as usize);
-        assert_block(target_node, target_node.get_tip_block_number(), &[], &[]);
-        assert_chain(target_node, &[]);
+
+        assert_chain_rewards(target_node);
     }
 }
 
@@ -178,7 +189,9 @@ impl Spec for ProposeDuplicated {
 
         let finalization_delay_length = node.consensus().finalization_delay_length();
         node.generate_blocks(2 * finalization_delay_length as usize);
-        assert_chain(node, &txs);
+
+        assert_transactions_committed(node, &txs);
+        assert_chain_rewards(node);
     }
 }
 
@@ -233,22 +246,6 @@ fn assert_chain_rewards(node: &Node) {
     }
 }
 
-fn assert_chain(node: &Node, transactions: &[TransactionView]) {
-    assert_transactions_committed(node, transactions);
-    assert_chain_rewards(node);
-}
-
-fn assert_block(
-    node: &Node,
-    block_number: BlockNumber,
-    proposals: &[TransactionView],
-    committed: &[TransactionView],
-) {
-    let block = node.get_block_by_number(block_number);
-    assert_proposals(&block, proposals);
-    assert_committed(&block, committed);
-}
-
 fn assert_proposals(block: &BlockView, expected: &[TransactionView]) {
     let mut actual_proposals: Vec<_> = block.union_proposal_ids_iter().collect();
     let mut expected_proposals: Vec<_> = expected.iter().map(|tx| tx.proposal_short_id()).collect();
diff --git a/test/src/specs/sync/chain_forks.rs b/test/src/specs/sync/chain_forks.rs
index 55626aed51..64383a3031 100644
--- a/test/src/specs/sync/chain_forks.rs
+++ b/test/src/specs/sync/chain_forks.rs
@@ -570,33 +570,45 @@ impl Spec for ForkedTransaction {
         let fixed_point = node0.get_tip_block_number();
         let tx = node1.new_transaction_spend_tip_cellbase();
 
-        // node0 doesn't have `tx`      => TxStatus: None
-        // node1 have `tx` on main-fork => TxStatus: Some(Committed)
+        // `node0` doesn't have `tx`      => TxStatus: None
         {
             node0.generate_blocks(1 + 2 * finalization_delay_length as usize);
-            node1.submit_transaction(&tx);
-            node1.generate_blocks(2 * finalization_delay_length as usize);
-
             let tx_status = node0.rpc_client().get_transaction(tx.hash());
             assert!(tx_status.is_none(), "node0 maintains tx in unverified fork");
+        }
+
+        // `node1` have `tx` on main-fork => TxStatus: Some(Committed)
+        {
+            node1.submit_transaction(&tx);
+            node1.generate_blocks(2 * finalization_delay_length as usize);
             let tx_status = node1.rpc_client().get_transaction(tx.hash()).unwrap();
             is_committed(&tx_status);
         }
 
-        // node0 have `tx` on unverified-fork => TxStatus: None
-        // node1 have `tx` on verified-fork   => TxStatus: Some(Pending)
+        // `node0` have `tx` on unverified-fork only => TxStatus: None
+        //
+        // We submit the main-fork of `node1` to `node0`, that will be persisted as an
+        // unverified-fork inside `node0`.
         {
             (fixed_point..=node1.get_tip_block_number()).for_each(|number| {
                 let block = node1.get_block_by_number(number);
                 node0.submit_block(&block.data());
             });
+            let tx_status = node0.rpc_client().get_transaction(tx.hash());
+            assert!(tx_status.is_none(), "node0 maintains tx in unverified fork");
+        }
+
+        // node1 have `tx` on verified-fork   => TxStatus: Some(Pending)
+        //
+        // We submit the main-fork of `node0` to `node1`, that will trigger switching forks. Then
+        // the original main-fork of `node0` will become side verified-fork. And `tx` will be moved
+        // to gap-transactions-pool during switching forks
+        {
             (fixed_point..=node0.get_tip_block_number()).for_each(|number| {
                 let block = node0.get_block_by_number(number);
                 node1.submit_block(&block.data());
             });
 
-            let tx_status = node0.rpc_client().get_transaction(tx.hash());
-            assert!(tx_status.is_none(), "node0 maintains tx in unverified fork");
             let is_pending = |tx_status: &TransactionWithStatus| {
                 let pending_status = TxStatus::pending();
                 tx_status.tx_status.status == pending_status.status
@@ -604,7 +616,7 @@ impl Spec for ForkedTransaction {
             let tx_status = node1.rpc_client().get_transaction(tx.hash()).unwrap();
             assert!(
                 is_pending(&tx_status),
-                "node1 maintains tx in verified fork"
+                "node1 maintains tx in verified fork."
             );
         }
     }