collections: add Show impl test for HashMap
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@ -2003,6 +2003,20 @@ mod test_map {
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assert_eq!(m1, m2);
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}
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#[test]
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fn test_show() {
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let mut map: HashMap<int, int> = HashMap::new();
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let empty: HashMap<int, int> = HashMap::new();
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map.insert(1, 2);
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map.insert(3, 4);
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let map_str = format!("{}", map);
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assert!(map_str == "{1: 2, 3: 4}".to_owned() || map_str == "{3: 4, 1: 2}".to_owned());
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assert_eq!(format!("{}", empty), "{}".to_owned());
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}
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#[test]
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fn test_expand() {
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let mut m = HashMap::new();
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