Test with trybuild

client/cli/Cargo.toml

@@ -65,6 +65,7 @@ nix = "0.17.0"
 tempfile = "3.1.0"
 sp-io = { version = "2.0.0-rc3", path = "../../primitives/io" }
 sp-application-crypto = { version = "2.0.0-alpha.2", default-features = false, path = "../../primitives/application-crypto" }
+trybuild = { version = "1.0.35", features = ["diff"] }
 
 [features]
 wasmtime = [

client/cli/tests/ui.rs

@@ -0,0 +1,23 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2020 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+#[test]
+fn sc_cli_derive_trybuild() {
+	let t = trybuild::TestCases::new();
+	t.compile_fail("tests/ui/missing_argument.rs");
+}