test: fix weak and near-duplicate assertions in sanitize.rs (#720)

Author: github-actions[bot]

src/sanitize.rs

@@ -587,11 +587,12 @@ mod tests {
 
     #[test]
     fn test_sanitize_preserves_markdown_headings() {
+        // Markdown headings and bare issue references must not be neutralized.
+        // A bare "#123" (without a preceding bot keyword like "fixes") must NOT
+        // be wrapped in backticks — this assertion would pass even if "#123"
+        // were wrapped, so we assert the exact output instead.
         let input = "# Heading\n## Sub-heading\nIssue #123";
-        let result = sanitize(input);
-        assert!(result.contains("# Heading"));
-        assert!(result.contains("## Sub-heading"));
-        assert!(result.contains("#123"));
+        assert_eq!(sanitize(input), input);
     }
 
     // ── sanitize_config tests ─────────────────────────────────────────────
@@ -622,8 +623,10 @@ mod tests {
 
     #[test]
     fn test_sanitize_config_removes_control_chars() {
-        let input = "hello\x00world\x07!";
-        assert_eq!(sanitize_config(input), "helloworld!");
+        // ANSI escape sequences must be stripped through the config pipeline.
+        // "\x1b[0m" is the ANSI reset code; it should be removed, joining "val" and "ue".
+        let input = "val\x1b[0mue";
+        assert_eq!(sanitize_config(input), "value");
     }
 
     #[test]