chore: enable setting a static gas price via NodeConfig

Closes #1591

Author: grandima

e2e/tests/providers.rs

@@ -1250,20 +1250,22 @@ async fn tx_respects_policies() -> Result<()> {
 }
 
 #[tokio::test]
-#[ignore] // TODO: https://github.com/FuelLabs/fuels-rs/issues/1581
 async fn can_setup_static_gas_price() -> Result<()> {
     let expected_gas_price = 474;
     let node_config = NodeConfig {
         starting_gas_price: expected_gas_price,
+        gas_price_change_percent: 0,
         ..Default::default()
     };
     let provider = setup_test_provider(vec![], vec![], Some(node_config), None).await?;
 
     let gas_price = provider.estimate_gas_price(0).await?.gas_price;
-
     let da_cost = 1000;
     assert_eq!(gas_price, da_cost + expected_gas_price);
 
+    provider.produce_blocks(10, None).await?;
+    let gas_price_after_blocks = provider.estimate_gas_price(0).await?.gas_price;
+    assert_eq!(gas_price, gas_price_after_blocks);
     Ok(())
 }
 

packages/fuels-test-helpers/src/fuel_bin_service.rs

@@ -110,6 +110,11 @@ impl ExtendedConfig {
             self.node_config.starting_gas_price
         ));
 
+        args.push(format!(
+            "--gas-price-change-percent={}",
+            self.node_config.gas_price_change_percent
+        ));
+
         Ok(args)
     }
 

packages/fuels-test-helpers/src/node_types.rs

@@ -54,6 +54,7 @@ pub struct NodeConfig {
     pub vm_backtrace: bool,
     pub silent: bool,
     pub starting_gas_price: u64,
+    pub gas_price_change_percent: u64,
     pub graphql_request_body_bytes_limit: u64,
 }
 
@@ -70,6 +71,7 @@ impl Default for NodeConfig {
             vm_backtrace: false,
             silent: true,
             starting_gas_price: 1,
+            gas_price_change_percent: 0,
             graphql_request_body_bytes_limit: u64::MAX,
         }
     }