Add test for unstable syscall

substrate/frame/revive/fixtures/contracts/unstable_interface.rs

@@ -0,0 +1,44 @@
+// This file is part of Substrate.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#![no_std]
+#![no_main]
+
+extern crate common;
+
+#[polkavm_derive::polkavm_import]
+extern "C" {
+	pub fn set_code_hash();
+}
+
+// Export that is never called. We can put code here that should be in the binary
+// but is never supposed to be run.
+#[no_mangle]
+#[polkavm_derive::polkavm_export]
+pub extern "C" fn call_never() {
+	// make sure it is not optimized away
+	unsafe {
+		set_code_hash();
+	}
+}
+
+#[no_mangle]
+#[polkavm_derive::polkavm_export]
+pub extern "C" fn deploy() {}
+
+#[no_mangle]
+#[polkavm_derive::polkavm_export]
+pub extern "C" fn call() {}

substrate/frame/revive/src/tests.rs

@@ -4680,3 +4680,21 @@ fn unknown_syscall_rejected() {
 		)
 	});
 }
+
+#[test]
+fn unstable_interface_rejected() {
+	let (code, _) = compile_module("unstable_interface").unwrap();
+
+	ExtBuilder::default().existential_deposit(100).build().execute_with(|| {
+		<Test as Config>::Currency::set_balance(&ALICE, 1_000_000);
+
+		Test::set_unstable_interface(false);
+		assert_err!(
+			builder::bare_instantiate(Code::Upload(code.clone())).build().result,
+			<Error<Test>>::CodeRejected,
+		);
+
+		Test::set_unstable_interface(true);
+		assert_ok!(builder::bare_instantiate(Code::Upload(code)).build().result);
+	});
+}