compiler/rustc_span/src/lev_distance/tests.rs

   1 use super::*;
   2
   3 #[test]
   4 fn test_lev_distance() {
   5     use std::char::{from_u32, MAX};
   6     // Test bytelength agnosticity
   7     for c in (0..MAX as u32).filter_map(from_u32).map(|i| i.to_string()) {
   8         assert_eq!(lev_distance(&c[..], &c[..]), 0);
   9     }
  10
  11     let a = "\nMäry häd ä little lämb\n\nLittle lämb\n";
  12     let b = "\nMary häd ä little lämb\n\nLittle lämb\n";
  13     let c = "Mary häd ä little lämb\n\nLittle lämb\n";
  14     assert_eq!(lev_distance(a, b), 1);
  15     assert_eq!(lev_distance(b, a), 1);
  16     assert_eq!(lev_distance(a, c), 2);
  17     assert_eq!(lev_distance(c, a), 2);
  18     assert_eq!(lev_distance(b, c), 1);
  19     assert_eq!(lev_distance(c, b), 1);
  20 }
  21
  22 #[test]
  23 fn test_find_best_match_for_name() {
  24     use crate::create_default_session_globals_then;
  25     create_default_session_globals_then(|| {
  26         let input = vec![Symbol::intern("aaab"), Symbol::intern("aaabc")];
  27         assert_eq!(
  28             find_best_match_for_name(&input, Symbol::intern("aaaa"), None),
  29             Some(Symbol::intern("aaab"))
  30         );
  31
  32         assert_eq!(find_best_match_for_name(&input, Symbol::intern("1111111111"), None), None);
  33
  34         let input = vec![Symbol::intern("aAAA")];
  35         assert_eq!(
  36             find_best_match_for_name(&input, Symbol::intern("AAAA"), None),
  37             Some(Symbol::intern("aAAA"))
  38         );
  39
  40         let input = vec![Symbol::intern("AAAA")];
  41         // Returns None because `lev_distance > max_dist / 3`
  42         assert_eq!(find_best_match_for_name(&input, Symbol::intern("aaaa"), None), None);
  43
  44         let input = vec![Symbol::intern("AAAA")];
  45         assert_eq!(
  46             find_best_match_for_name(&input, Symbol::intern("aaaa"), Some(4)),
  47             Some(Symbol::intern("AAAA"))
  48         );
  49
  50         let input = vec![Symbol::intern("a_longer_variable_name")];
  51         assert_eq!(
  52             find_best_match_for_name(&input, Symbol::intern("a_variable_longer_name"), None),
  53             Some(Symbol::intern("a_longer_variable_name"))
  54         );
  55     })
  56 }