Ignore tests for Windows platforms.

src/find/matchers/group.rs

@@ -64,7 +64,7 @@ impl Matcher for GroupMatcher {
     fn matches(&self, _file_info: &walkdir::DirEntry, _: &mut super::MatcherIO) -> bool {
         // The user group acquisition function for Windows systems is not implemented in MetadataExt,
         // so it is somewhat difficult to implement it. :(
-        true
+        false
     }
 }
 

tests/find_cmd_tests.rs

@@ -546,6 +546,7 @@ fn expression_empty_parentheses() {
 }
 
 #[test]
+#[cfg(unix)]
 #[serial(working_dir)]
 fn find_with_user_predicate() {
     Command::cargo_bin("find")