From 72e037d85f4d1dde1da156f59c3891e9f963ea15 Mon Sep 17 00:00:00 2001
From: Jonathan Keller <jonathan.keller@infineon.com>
Date: Tue, 10 Sep 2024 10:05:05 -0700
Subject: [PATCH] [tests] Fail on invalid cfg(feature) directives

The current implementation does not generate valid feature flags for
derived peripherals, but this was not caught by the tests because rustc
only emits a warning rather than an error.
---
 tests/common/mod.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tests/common/mod.rs b/tests/common/mod.rs
index a8e7b6b..af1c2ef 100644
--- a/tests/common/mod.rs
+++ b/tests/common/mod.rs
@@ -30,6 +30,8 @@ pub fn assert_cargo_build(package_folder: tempfile::TempDir) {
     let mut command = Command::new("cargo");
     command.arg("build");
     command.current_dir(package_folder.path());
+    // Error on invalid cfg(feature) directives
+    command.env("RUSTFLAGS", "-D unexpected_cfgs");
 
     let exec_result = command.output();