chore(nns/sns): remove unnecessary mut from test functions

rs/nns/integration_tests/src/canister_upgrade.rs

@@ -28,7 +28,7 @@ fn setup_state_machine_with_nns_canisters() -> StateMachine {
 
 #[test]
 fn upgrade_canister() {
-    let mut state_machine = setup_state_machine_with_nns_canisters();
+    let state_machine = setup_state_machine_with_nns_canisters();
     let n1 = get_neuron_1();
     let lifeline_canister_id = CanisterId::from_u64(LIFELINE_CANISTER_INDEX_IN_NNS_SUBNET);
     let root_status_before = get_root_canister_status(&state_machine).unwrap();
@@ -53,7 +53,7 @@ fn upgrade_canister() {
     };
     // make proposal with neuron 1, it has enough voting power such that the proposal will be accepted
     let response =
-        nns_governance_make_proposal(&mut state_machine, n1.principal_id, n1.neuron_id, &proposal)
+        nns_governance_make_proposal(&state_machine, n1.principal_id, n1.neuron_id, &proposal)
             .command
             .expect("Making NNS proposal failed");
 

rs/nns/integration_tests/src/copy_inactive_neurons_to_stable_memory.rs

@@ -15,12 +15,12 @@ fn test_copy_inactive_neurons_to_stable_memory() {
     // Step 1: Prepare the world
 
     // Step 1.1: Populate StateMachine from a state_dir.
-    let mut state_machine = new_state_machine_with_golden_nns_state_or_panic();
+    let state_machine = new_state_machine_with_golden_nns_state_or_panic();
 
     // Step 1.2: Create a super powerful Neuron.
     println!("Creating super powerful Neuron.");
     let controller = PrincipalId::new_self_authenticating(&[1, 2, 3, 4]);
-    let neuron_id = nns_create_super_powerful_neuron(&mut state_machine, controller);
+    let neuron_id = nns_create_super_powerful_neuron(&state_machine, controller);
     println!("Done creating super powerful Neuron.");
 
     // Step 1.3: Install NNS governance WASM built with `feature = "test"`. In the future, `feature
@@ -31,7 +31,7 @@ fn test_copy_inactive_neurons_to_stable_memory() {
     let new_wasm_hash = Sha256::hash(&new_wasm_content);
     println!("Proposing governance upgrade... ");
     let proposal_id = nns_propose_upgrade_nns_canister(
-        &mut state_machine,
+        &state_machine,
         controller,
         neuron_id,
         GOVERNANCE_CANISTER_ID, // Target, i.e. the canister that we want to upgrade.
@@ -106,7 +106,7 @@ fn test_copy_inactive_neurons_to_stable_memory() {
     for i in 0..600 {
         state_machine.tick();
 
-        last_migration = nns_get_migrations(&mut state_machine)
+        last_migration = nns_get_migrations(&state_machine)
             .copy_inactive_neurons_to_stable_memory_migration
             .unwrap_or_default();
 
@@ -141,7 +141,7 @@ fn test_copy_inactive_neurons_to_stable_memory() {
     assert_eq!(status, MigrationStatus::Succeeded);
 
     // Step 3.2: Assert that there is now a large number of neurons in stable memory.
-    let scrape = scrape_metrics(&mut state_machine, GOVERNANCE_CANISTER_ID);
+    let scrape = scrape_metrics(&state_machine, GOVERNANCE_CANISTER_ID);
     let len = get_gauge(&scrape, "governance_stable_memory_neuron_count") as u64;
     assert!(len > 100_000, "{}", len);
 

rs/nns/integration_tests/src/create_service_nervous_system.rs

@@ -50,7 +50,7 @@ const ONE_TRILLION: u128 = 1_000_000_000_000;
 fn test_several_proposals() {
     // Step 1: Prepare the world.
 
-    let mut state_machine = state_machine_builder_for_nns_tests().build();
+    let state_machine = state_machine_builder_for_nns_tests().build();
 
     // Step 1.1: Boot up NNS.
     let nns_init_payload = NnsInitPayloadsBuilder::new()
@@ -81,7 +81,7 @@ fn test_several_proposals() {
 
     // Step 2.1: Make a proposal. Leave it open so that the next proposal is
     // foiled.
-    let response_1 = make_proposal(&mut state_machine, /* sns_number = */ 1);
+    let response_1 = make_proposal(&state_machine, /* sns_number = */ 1);
     let response_1 = match response_1.command {
         Some(manage_neuron_response::Command::MakeProposal(response_3)) => response_3,
         _ => panic!("First proposal failed to be submitted: {:#?}", response_1),
@@ -98,7 +98,7 @@ fn test_several_proposals() {
 
     // Step 2.2: Make another proposal. This one should be foiled, because the
     // first proposal is still open.
-    let response_2 = make_proposal(&mut state_machine, 666);
+    let response_2 = make_proposal(&state_machine, 666);
     match response_2.command {
         Some(manage_neuron_response::Command::Error(err)) => {
             assert_eq!(
@@ -113,13 +113,13 @@ fn test_several_proposals() {
     }
 
     // Step 2.3: This unblocks more proposals from being made.
-    execute_proposal(&mut state_machine, ProposalId { id: proposal_id_1 });
+    execute_proposal(&state_machine, ProposalId { id: proposal_id_1 });
 
     // Step 2.4: Wait for proposal_1 to finish executing.
-    nns_wait_for_proposal_execution(&mut state_machine, proposal_id_1);
+    nns_wait_for_proposal_execution(&state_machine, proposal_id_1);
 
     // Step 2.5: Finally, make a third proposal. This should now be allowed.
-    let response_3 = make_proposal(&mut state_machine, 3);
+    let response_3 = make_proposal(&state_machine, 3);
     let response_3 = match response_3.command {
         Some(manage_neuron_response::Command::MakeProposal(response_3)) => response_3,
         _ => panic!("First proposal failed to be submitted: {:#?}", response_3),
@@ -139,7 +139,7 @@ fn test_several_proposals() {
     // Step 3.1: Inspect proposals.
 
     // There should only be two proposals of type CreateServiceNervousSystem.
-    let final_proposals = nns_list_proposals(&mut state_machine)
+    let final_proposals = nns_list_proposals(&state_machine)
         .proposal_info
         .into_iter()
         .filter_map(
@@ -177,12 +177,12 @@ fn test_several_proposals() {
 
     // Step 3.2: Inspect SNS(s).
 
-    let snses = list_deployed_snses(&mut state_machine).instances;
+    let snses = list_deployed_snses(&state_machine).instances;
     assert_eq!(snses.len(), 1, "{:#?}", snses);
 }
 
 /// Makes a CreateServiceNervousSystem proposal using test neuron 2.
-fn make_proposal(state_machine: &mut StateMachine, sns_number: u64) -> ManageNeuronResponse {
+fn make_proposal(state_machine: &StateMachine, sns_number: u64) -> ManageNeuronResponse {
     let neuron_id = nns_common_pb::NeuronId {
         id: TEST_NEURON_2_ID,
     };
@@ -204,7 +204,7 @@ fn make_proposal(state_machine: &mut StateMachine, sns_number: u64) -> ManageNeu
 
 /// Makes test neuron 1 vote for the proposal. This should cause it to be
 /// adopted and executed.
-fn execute_proposal(state_machine: &mut StateMachine, proposal_id: ProposalId) {
+fn execute_proposal(state_machine: &StateMachine, proposal_id: ProposalId) {
     state_machine
         .execute_ingress_as(
             *TEST_NEURON_1_OWNER_PRINCIPAL,

rs/nns/integration_tests/src/cycles_minting_canister.rs

@@ -303,7 +303,7 @@ fn test_cmc_notify_create_with_settings() {
     let icpts = Tokens::new(100, 0).unwrap();
     let neuron = get_neuron_1();
 
-    let mut state_machine = state_machine_builder_for_nns_tests().build();
+    let state_machine = state_machine_builder_for_nns_tests().build();
     let nns_init_payloads = NnsInitPayloadsBuilder::new()
         .with_test_neurons()
         .with_ledger_account(account, icpts)
@@ -312,7 +312,7 @@ fn test_cmc_notify_create_with_settings() {
 
     let subnet_id = state_machine.get_subnet_id();
     cmc_set_default_authorized_subnetworks(
-        &mut state_machine,
+        &state_machine,
         vec![subnet_id],
         neuron.principal_id,
         neuron.neuron_id,
@@ -428,7 +428,7 @@ fn test_cmc_cycles_create_with_settings() {
     let icpts = Tokens::new(100, 0).unwrap();
     let neuron = get_neuron_1();
 
-    let mut state_machine = state_machine_builder_for_nns_tests().build();
+    let state_machine = state_machine_builder_for_nns_tests().build();
     let nns_init_payloads = NnsInitPayloadsBuilder::new()
         .with_test_neurons()
         .with_ledger_account(account, icpts)
@@ -437,7 +437,7 @@ fn test_cmc_cycles_create_with_settings() {
 
     let subnet_id = state_machine.get_subnet_id();
     cmc_set_default_authorized_subnetworks(
-        &mut state_machine,
+        &state_machine,
         vec![subnet_id],
         neuron.principal_id,
         neuron.neuron_id,

rs/nns/integration_tests/src/cycles_minting_canister_with_exchange_rate_canister.rs

@@ -52,7 +52,7 @@ fn reinstall_mock_exchange_rate_canister(
 
 // Creates an ICP/XDR conversion rate proposal.
 fn propose_icp_xdr_rate(
-    machine: &mut StateMachine,
+    machine: &StateMachine,
     xdr_permyriad_per_icp: u64,
     timestamp_seconds: u64,
     reason: Option<UpdateIcpXdrConversionRatePayloadReason>,
@@ -330,7 +330,7 @@ fn test_enable_retrieving_rate_from_exchange_rate_canister() {
 #[test]
 fn test_disabling_and_reenabling_exchange_rate_canister_calling_via_exchange_rate_proposal() {
     // Step 1: Prepare the world.
-    let mut state_machine = state_machine_builder_for_nns_tests()
+    let state_machine = state_machine_builder_for_nns_tests()
         .with_time(GENESIS)
         .build();
 
@@ -391,12 +391,12 @@ fn test_disabling_and_reenabling_exchange_rate_canister_calling_via_exchange_rat
     // Step 3: Send in a proposal with a diverged rate reason. Ensure that the CMC
     // stops calling the mock exchange rate canister.
     let proposal_id = propose_icp_xdr_rate(
-        &mut state_machine,
+        &state_machine,
         210_000,
         cmc_first_rate_timestamp_seconds + FIVE_MINUTES_SECONDS + ONE_MINUTE_SECONDS,
         Some(UpdateIcpXdrConversionRatePayloadReason::DivergedRate),
     );
-    nns_wait_for_proposal_execution(&mut state_machine, proposal_id);
+    nns_wait_for_proposal_execution(&state_machine, proposal_id);
 
     // Check if proposal has set the rate.
     let response = get_icp_xdr_conversion_rate(&state_machine);
@@ -423,12 +423,12 @@ fn test_disabling_and_reenabling_exchange_rate_canister_calling_via_exchange_rat
     // Ensure that a proposal with a OldRate reason does not reactivate the
     // update cycle.
     let proposal_id = propose_icp_xdr_rate(
-        &mut state_machine,
+        &state_machine,
         200_000,
         cmc_first_rate_timestamp_seconds + FIVE_MINUTES_SECONDS * 2,
         Some(UpdateIcpXdrConversionRatePayloadReason::OldRate),
     );
-    nns_wait_for_proposal_execution(&mut state_machine, proposal_id);
+    nns_wait_for_proposal_execution(&state_machine, proposal_id);
 
     let response = get_icp_xdr_conversion_rate(&state_machine);
     assert_eq!(
@@ -450,12 +450,12 @@ fn test_disabling_and_reenabling_exchange_rate_canister_calling_via_exchange_rat
 
     // Re-enable calls to the exchange rate canister.
     let proposal_id = propose_icp_xdr_rate(
-        &mut state_machine,
+        &state_machine,
         220_000,
         cmc_first_rate_timestamp_seconds + FIVE_MINUTES_SECONDS * 3,
         Some(UpdateIcpXdrConversionRatePayloadReason::EnableAutomaticExchangeRateUpdates),
     );
-    nns_wait_for_proposal_execution(&mut state_machine, proposal_id);
+    nns_wait_for_proposal_execution(&state_machine, proposal_id);
 
     let response = get_icp_xdr_conversion_rate(&state_machine);
     assert_eq!(

rs/nns/integration_tests/src/governance_migrations.rs

@@ -87,7 +87,7 @@ fn assert_neuron_indexes_lens(
 
 #[test]
 fn test_neuron_indexes_migrations() {
-    let mut state_machine = state_machine_builder_for_nns_tests().build();
+    let state_machine = state_machine_builder_for_nns_tests().build();
     let nns_init_payloads = NnsInitPayloadsBuilder::new().with_test_neurons().build();
     setup_nns_canisters(&state_machine, nns_init_payloads);
 
@@ -114,7 +114,7 @@ fn test_neuron_indexes_migrations() {
 
     // Follow will cause the neuron to be modified.
     let follow_response = nns_set_followees_for_neuron(
-        &mut state_machine,
+        &state_machine,
         neuron_3.principal_id,
         neuron_3.neuron_id,
         &[neuron_1.neuron_id, neuron_2.neuron_id],
@@ -137,7 +137,7 @@ fn test_neuron_indexes_migrations() {
 
     // Split will cause a neuron to be created.
     let split_response = nns_split_neuron(
-        &mut state_machine,
+        &state_machine,
         neuron_1.principal_id,
         neuron_1.neuron_id,
         500_000_000,