Revert "Fix dev check rejecting exercises with CRLF line endings"

Author: mo8it

src/dev/check.rs

@@ -118,7 +118,7 @@ fn check_info_file_exercises(info_file: &InfoFile) -> Result<HashSet<PathBuf>> {
             );
         }
 
-        let contains_tests = exercise_has_tests(&file_buf);
+        let contains_tests = file_buf.contains("#[test]\n");
         if exercise_info.test {
             if !contains_tests {
                 bail!(
@@ -139,13 +139,6 @@ fn check_info_file_exercises(info_file: &InfoFile) -> Result<HashSet<PathBuf>> {
     Ok(paths)
 }
 
-// Check if the exercise contains `#[test]`-annotated tests.
-// CRLF line endings are normalized first so that the check doesn't fail
-// on files with Windows line endings (e.g. `#[test]\r\n`).
-fn exercise_has_tests(file_content: &str) -> bool {
-    file_content.replace("\r\n", "\n").contains("#[test]\n")
-}
-
 // Check `dir` for unexpected files.
 // Only Rust files in `allowed_rust_files` and `README.md` files are allowed.
 // Only one level of directory nesting is allowed.
@@ -403,21 +396,3 @@ pub fn check(require_solutions: bool) -> Result<()> {
 }
 
 const SKIP_CHECK_UNSOLVED_HINT: &str = "If this is an introduction exercise that is intended to be already solved, add `skip_check_unsolved = true` to the exercise's metadata in the `info.toml` file";
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn detects_tests_in_files_with_crlf_line_endings() {
-        let content = "fn main() {}\r\n\r\n#[cfg(test)]\r\nmod tests {\r\n    #[test]\r\n    fn it_works() {}\r\n}\r\n";
-        assert!(exercise_has_tests(content));
-    }
-
-    #[test]
-    fn detects_tests_in_files_with_lf_line_endings() {
-        let content =
-            "fn main() {}\n\n#[cfg(test)]\nmod tests {\n    #[test]\n    fn it_works() {}\n}\n";
-        assert!(exercise_has_tests(content));
-    }
-}