assert "src/tools/tidy/src/issues.txt" length

Signed-off-by: onur-ozkan <work@onurozkan.dev>

src/tools/tidy/src/ui_tests.rs

@@ -100,6 +100,9 @@ fn check_entries(tests_path: &Path, bad: &mut bool) {
 }
 
 pub fn check(root_path: &Path, bless: bool, bad: &mut bool) {
+    // This can be decreased but can never be increased.
+    const EXPECTED_LINE_COUNT: usize = 4372;
+
     let path = &root_path.join("tests");
     check_entries(&path, bad);
 
@@ -120,6 +123,12 @@ pub fn check(root_path: &Path, bless: bool, bad: &mut bool) {
         })
         .collect();
 
+    assert_eq!(
+        EXPECTED_LINE_COUNT,
+        allowed_issue_names.len(),
+        "If you have added new lines to issues.txt, please revert them; otherwise, decrease the EXPECTED_LINE_COUNT."
+    );
+
     if !is_sorted && !bless {
         tidy_error!(
             bad,