Use BankForks on tests - Part 1 (solana-labs#34206)

---------

Signed-off-by: Lucas Steuernagel <lucas.tnagel@gmail.com>

runtime/src/bank.rs

@@ -966,6 +966,17 @@ pub(super) enum RewardInterval {
 }
 
 impl Bank {
+    fn wrap_with_bank_forks_for_tests(self) -> (Arc<Self>, Arc<RwLock<BankForks>>) {
+        let bank_fork = BankForks::new_rw_arc(self);
+        let bank_arc = bank_fork.read().unwrap().root_bank();
+        bank_arc
+            .loaded_programs_cache
+            .write()
+            .unwrap()
+            .set_fork_graph(bank_fork.clone());
+        (bank_arc, bank_fork)
+    }
+
     pub fn default_for_tests() -> Self {
         Self::default_with_accounts(Accounts::default_for_tests())
     }
@@ -978,6 +989,23 @@ impl Bank {
         Self::new_for_tests_with_config(genesis_config, BankTestConfig::default())
     }
 
+    pub fn new_with_bank_forks_for_tests(
+        genesis_config: &GenesisConfig,
+    ) -> (Arc<Self>, Arc<RwLock<BankForks>>) {
+        let bank = Self::new_for_tests(genesis_config);
+        bank.wrap_with_bank_forks_for_tests()
+    }
+
+    pub fn new_with_mockup_builtin_for_tests(
+        genesis_config: &GenesisConfig,
+        program_id: Pubkey,
+        builtin_function: BuiltinFunctionWithContext,
+    ) -> (Arc<Self>, Arc<RwLock<BankForks>>) {
+        let mut bank = Self::new_for_tests(genesis_config);
+        bank.add_mockup_builtin(program_id, builtin_function);
+        bank.wrap_with_bank_forks_for_tests()
+    }
+
     pub fn new_for_tests_with_config(
         genesis_config: &GenesisConfig,
         test_config: BankTestConfig,