json_matcher/matchers/
null.rs

1use serde_json::Value;
2
3use crate::{JsonMatcher, JsonMatcherError};
4
5pub struct NullMatcher {}
6
7impl Default for NullMatcher {
8    fn default() -> Self {
9        Self::new()
10    }
11}
12
13impl NullMatcher {
14    pub fn new() -> Self {
15        Self {}
16    }
17}
18
19impl JsonMatcher for NullMatcher {
20    fn json_matches(&self, value: &Value) -> Vec<JsonMatcherError> {
21        match value {
22            Value::Null => vec![],
23            _ => vec![JsonMatcherError::at_root("Value is not null")],
24        }
25    }
26}
27
28impl JsonMatcher for () {
29    fn json_matches(&self, value: &Value) -> Vec<JsonMatcherError> {
30        NullMatcher::new().json_matches(value)
31    }
32}
33
34#[cfg(test)]
35mod tests {
36    use crate::assert_jm;
37
38    use super::*;
39
40    #[test]
41    fn test_null_matcher() {
42        let matcher = NullMatcher::new();
43        assert_jm!(Value::Null, matcher);
44        assert_eq!(
45            *std::panic::catch_unwind(|| {
46                assert_jm!(Value::String("world".to_string()), matcher)
47            })
48            .err()
49            .unwrap()
50            .downcast::<String>()
51            .unwrap(),
52            r#"
53Json matcher failed:
54  - $: Value is not null
55
56Actual:
57"world""#
58        );
59    }
60
61    #[test]
62    fn test_raw_implementations() {
63        assert_eq!(().json_matches(&Value::Null), vec![]);
64        assert_eq!(
65            ().json_matches(&Value::Bool(true))
66                .into_iter()
67                .map(|x| x.to_string())
68                .collect::<String>(),
69            "$: Value is not null"
70        );
71    }
72}
json_matcher/matchers/null.rs

json_matcher/matchers/
null.rs
