Minimal effective gas price in the queue (#8934)

* Minimal effective gas price.

* Fix naming, add test

* Fix minimal entry score and add test.

* Fix worst_transaction.

* Remove effective gas price threshold.

* Don't leak gas_price decisions out of Scoring.

miner/src/pool/tests/mod.rs

@@ -875,8 +875,8 @@ fn should_avoid_verifying_transaction_already_in_pool() {
 		},
 		PrioritizationStrategy::GasPriceOnly,
 	);
-	let client = TestClient::new();
-	let tx1 = Tx::default().signed().unverified();
+	let client = TestClient::new().with_balance(1_000_000_000);
+	let tx1 = Tx::gas_price(2).signed().unverified();
 
 	let res = txq.import(client.clone(), vec![tx1.clone()]);
 	assert_eq!(res, vec![Ok(())]);
@@ -892,3 +892,41 @@ fn should_avoid_verifying_transaction_already_in_pool() {
 	// then
 	assert_eq!(txq.status().status.transaction_count, 1);
 }
+
+#[test]
+fn should_reject_early_in_case_gas_price_is_less_than_min_effective() {
+	// given
+	let txq = TransactionQueue::new(
+		txpool::Options {
+			max_count: 1,
+			max_per_sender: 2,
+			max_mem_usage: 50
+		},
+		verifier::Options {
+			minimal_gas_price: 1.into(),
+			block_gas_limit: 1_000_000.into(),
+			tx_gas_limit: 1_000_000.into(),
+		},
+		PrioritizationStrategy::GasPriceOnly,
+	);
+	let client = TestClient::new().with_balance(1_000_000_000);
+	let tx1 = Tx::gas_price(2).signed().unverified();
+
+	let res = txq.import(client.clone(), vec![tx1]);
+	assert_eq!(res, vec![Ok(())]);
+	assert_eq!(txq.status().status.transaction_count, 1);
+	assert!(client.was_verification_triggered());
+
+	// when
+	let client = TestClient::new();
+	let tx1 = Tx::default().signed().unverified();
+	let res = txq.import(client.clone(), vec![tx1]);
+	assert_eq!(res, vec![Err(transaction::Error::InsufficientGasPrice {
+		minimal: 2.into(),
+		got: 1.into(),
+	})]);
+	assert!(!client.was_verification_triggered());
+
+	// then
+	assert_eq!(txq.status().status.transaction_count, 1);
+}