chore: fix unused code warning on windows

Author: Boshen

src/tests/simple.rs

@@ -2,7 +2,7 @@
 
 use std::env;
 
-use crate::{ResolveOptions, Resolver};
+use crate::Resolver;
 
 #[test]
 fn simple() {
@@ -46,16 +46,23 @@ fn dashed_name() {
     }
 }
 
-#[test]
 #[cfg(not(target_os = "windows"))] // MemoryFS's path separator is always `/` so the test will not pass in windows.
-fn no_package() {
-    use super::memory_fs::MemoryFS;
-    use crate::ResolverGeneric;
-    use std::path::Path;
-    let f = Path::new("/");
-    let file_system = MemoryFS::new(&[]);
-    let resolver =
-        ResolverGeneric::<MemoryFS>::new_with_file_system(file_system, ResolveOptions::default());
-    let resolved_path = resolver.resolve(f, "package");
-    assert!(resolved_path.is_err());
+mod windows {
+    use super::super::memory_fs::MemoryFS;
+
+    use crate::ResolveOptions;
+
+    #[test]
+    fn no_package() {
+        use crate::ResolverGeneric;
+        use std::path::Path;
+        let f = Path::new("/");
+        let file_system = MemoryFS::new(&[]);
+        let resolver = ResolverGeneric::<MemoryFS>::new_with_file_system(
+            file_system,
+            ResolveOptions::default(),
+        );
+        let resolved_path = resolver.resolve(f, "package");
+        assert!(resolved_path.is_err());
+    }
 }