add smoketest for std::net::hostname

Author: RalfJung

library/std/src/net/test.rs

@@ -36,3 +36,13 @@ pub fn compare_ignore_zoneid(a: &SocketAddr, b: &SocketAddr) -> bool {
         _ => a == b,
     }
 }
+
+#[test]
+fn hostname_smoketest() {
+    // Just a smoke test to ensure it can be called.
+    let name = crate::net::hostname();
+    if cfg!(windows) || cfg!(unix) {
+        // At least on Windows and Unix, this should succeed.
+        name.unwrap();
+    }
+}

src/tools/tidy/src/pal.rs

@@ -89,7 +89,7 @@ pub fn check(library_path: &Path, tidy_ctx: TidyCtx) {
         }
 
         // exclude tests and benchmarks as some platforms do not support all tests
-        if filestr.contains("tests") || filestr.contains("benches") {
+        if filestr.contains("tests") || filestr.contains("test.rs") || filestr.contains("benches") {
             return;
         }