test as documentation

[danielecr]

I was looking for a crate just like this, but I had to look at the code to see if works when replaced text contains other replacement.
Can be added a test case like this:

    #[test]
    fn test_hashmap_replacement_skip_nested() {
        let mut table = HashMap::new();
        table.insert("placeholder", "{{crazy}}");
        table.insert("crazy", "{{placeholder}}");

        assert_eq!(
            Template::new("hello {{placeholder}} world of {{crazy}}").fill_with_hashmap(&table),
            "hello {{crazy}} world of {{placeholder}}"
        );
    }

[danielecr]

I also found that this test fails:

    fn test_hashmap_replacement_skip_nested2() {
        let mut table = HashMap::new();
        table.insert("placeholder", "{{crazy}}");
        table.insert("crazy", "{{placeholder}}");
        assert_eq!(
            Template::new("hello {{placeholder{{crazy}}}} world of {{crazy{{placeholder}} }}").fill_with_hashmap(&table),
            "hello {{placeholder{{crazy}}}} world of {{crazy{{placeholder}} }}"
        );
    }

assertion `left == right` failed
  left: "hello }} world of  }}"
 right: "hello {{crazy}} world of {{placeholder}}"