Add C Serialization Tests for #17217 (backport #17294)

programs/bpf/tests/programs.rs

@@ -1910,6 +1910,38 @@ fn test_program_bpf_disguised_as_bpf_loader() {
     }
 }
 
+#[test]
+#[cfg(feature = "bpf_c")]
+fn test_program_bpf_c_dup() {
+    solana_logger::setup();
+
+    let GenesisConfigInfo {
+        genesis_config,
+        mint_keypair,
+        ..
+    } = create_genesis_config(50);
+    let mut bank = Bank::new(&genesis_config);
+    let (name, id, entrypoint) = solana_bpf_loader_program!();
+    bank.add_builtin(&name, id, entrypoint);
+
+    let account_address = Pubkey::new_unique();
+    let account =
+        AccountSharedData::new_data(42, &[1_u8, 2, 3], &solana_sdk::system_program::id()).unwrap();
+    bank.store_account(&account_address, &account);
+
+    let bank_client = BankClient::new(bank);
+
+    let program_id = load_bpf_program(&bank_client, &bpf_loader::id(), &mint_keypair, "ser");
+    let account_metas = vec![
+        AccountMeta::new_readonly(account_address, false),
+        AccountMeta::new_readonly(account_address, false),
+    ];
+    let instruction = Instruction::new_with_bytes(program_id, &[4, 5, 6, 7], account_metas);
+    bank_client
+        .send_and_confirm_instruction(&mint_keypair, instruction)
+        .unwrap();
+}
+
 #[cfg(feature = "bpf_rust")]
 #[test]
 fn test_program_bpf_upgrade_via_cpi() {