test: use base_rs_contract where appropriate

`rs_contract` can be used by tests that run only on  the latest
 protocol version, as defined by the const PROTOCOL_VERSION.

`base_rs_contract` must be used in backwards compatibility tests that
 rely on specific protocol versions.

This is a pre-requisite to land the rustc 1.70 toolchain upgrade.
(See also near#9140)

integration-tests/src/tests/client/features/increase_storage_compute_cost.rs

@@ -207,7 +207,7 @@ fn assert_compute_limit_reached(
     // setup: deploy the contract
     {
         // This contract has a bunch of methods to invoke storage operations.
-        let code = near_test_contracts::rs_contract().to_vec();
+        let code = near_test_contracts::base_rs_contract().to_vec();
         let actions = vec![Action::DeployContract(DeployContractAction { code })];
 
         let signer = InMemorySigner::from_seed(

integration-tests/src/tests/client/features/nearvm.rs

@@ -36,7 +36,7 @@ fn test_nearvm_upgrade() {
         deploy_test_contract(
             &mut env,
             "test0".parse().unwrap(),
-            near_test_contracts::rs_contract(),
+            near_test_contracts::base_rs_contract(),
             epoch_length,
             1,
         );

runtime/near-vm-runner/src/tests/rs_contract.rs

@@ -16,8 +16,13 @@ use crate::tests::{
 };
 use crate::vm_kind::VMKind;
 
-fn test_contract() -> ContractCode {
-    let code = near_test_contracts::rs_contract();
+fn test_contract(vm_kind: VMKind) -> ContractCode {
+    let code = match vm_kind {
+        // testing backwards-compatibility, use an old WASM
+        VMKind::Wasmer0 | VMKind::Wasmer2 => near_test_contracts::base_rs_contract(),
+        // production and developer environment, use a cutting-edge WASM
+        VMKind::Wasmtime | VMKind::NearVm => near_test_contracts::rs_contract(),
+    };
     ContractCode::new(code.to_vec(), None)
 }
 
@@ -39,7 +44,7 @@ fn assert_run_result(result: VMResult, expected_value: u64) {
 pub fn test_read_write() {
     let config = VMConfig::test();
     with_vm_variants(&config, |vm_kind: VMKind| {
-        let code = test_contract();
+        let code = test_contract(vm_kind);
         let mut fake_external = MockedExternal::new();
 
         let context = create_context(encode(&[10u64, 20u64]));
@@ -112,7 +117,7 @@ fn run_test_ext(
     validators: Vec<(&str, Balance)>,
     vm_kind: VMKind,
 ) {
-    let code = test_contract();
+    let code = test_contract(vm_kind);
     let mut fake_external = MockedExternal::new();
     fake_external.validators =
         validators.into_iter().map(|(s, b)| (s.parse().unwrap(), b)).collect();
@@ -218,7 +223,7 @@ pub fn test_out_of_memory() {
             _ => {}
         }
 
-        let code = test_contract();
+        let code = test_contract(vm_kind);
         let mut fake_external = MockedExternal::new();
 
         let context = create_context(Vec::new());