don't ignore all tests

Author: donno2048

src/tools/tidy/src/style.rs

@@ -402,9 +402,10 @@ pub fn check(path: &Path, bad: &mut bool) {
         let is_test = file.components().any(|c| c.as_os_str() == "tests")
             || file.file_stem().unwrap() == "tests";
         let is_style = file.ends_with(style_file) || style_file.ends_with(file);
+        let is_style_test = is_test && file.parent().unwrap().ends_with(style_file.with_extension(""));
         // scanning the whole file for multiple needles at once is more efficient than
         // executing lines times needles separate searches.
-        let any_problematic_line = !is_style && !is_test && problematic_regex.is_match(contents);
+        let any_problematic_line = !is_style && !is_style_test && problematic_regex.is_match(contents);
         for (i, line) in contents.split('\n').enumerate() {
             if line.is_empty() {
                 if i == 0 {