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#[test]
fn test_deserialize_seed() {
// Test adapted from David Tolnay's serde-yaml:
struct Seed(i64);
impl<'de> serde::de::DeserializeSeed<'de> for Seed {
type Value = i64;
fn deserialize<D>(self, deserializer: D) -> Result<i64, D::Error>
where
D: serde::de::Deserializer<'de>,
{
struct Visitor(i64);
impl<'de> serde::de::Visitor<'de> for Visitor {
type Value = i64;
fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(formatter, "an integer")
}
fn visit_i64<E: serde::de::Error>(self, v: i64) -> Result<i64, E> {
Ok(v * self.0)
}
fn visit_u64<E: serde::de::Error>(self, v: u64) -> Result<i64, E> {
Ok(v as i64 * self.0)
}
}
deserializer.deserialize_any(Visitor(self.0))
}
}
let cases = [("3", 5, 15), ("6", 7, 42), ("-5", 9, -45)];
for &(ron, seed, expected) in &cases {
let deserialized = ron::Options::default()
.from_str_seed(ron, Seed(seed))
.unwrap();
assert_eq!(expected, deserialized);
}
assert_eq!(
ron::Options::default().from_str_seed("'a'", Seed(42)),
Err(ron::error::SpannedError {
code: ron::Error::InvalidValueForType {
expected: String::from("an integer"),
found: String::from("the string \"a\""),
},
position: ron::error::Position { line: 1, col: 4 },
})
);
}