test: verify serde YAML compatibility

Deserializing `jiff` types from YAML is not
currently possible.

Neither `serde_yaml` nor its maintained fork
`serde_yml` support deserializing from bytes.

These tests serve in both

- proving the current incompatibility
- verifying the fix in the following commit,
  which migrates `Deserialize` implementations
  to `deserializer.deserialize_str`.

Related to BurntSushi#148, BurntSushi#138

Cargo.toml

@@ -110,6 +110,7 @@ jiff = { path = "./", features = ["serde"] }
 quickcheck = { version = "1.0.3", default-features = false }
 serde = { version = "1.0.203", features = ["derive"] }
 serde_json = "1.0.117"
+serde_yml = "0.0.12"
 tabwriter = "1.4.0"
 time = { version = "0.3.36", features = ["local-offset", "macros", "parsing"] }
 tzfile = "0.1.3"

src/civil/date.rs

@@ -3651,6 +3651,8 @@ fn day_of_year(year: Year, day: i16) -> Result<Date, Error> {
 
 #[cfg(test)]
 mod tests {
+    use std::io::Cursor;
+
     use crate::{civil::date, tz::TimeZone, Timestamp, ToSpan};
 
     use super::*;
@@ -4006,4 +4008,30 @@ mod tests {
             d1 == got
         }
     }
+
+    /// # `serde` deserializer compatibility test
+    ///
+    /// Serde YAML used to be unable to deserialize `jiff` types,
+    /// as deserializing from bytes is not supported by the deserializer.
+    ///
+    /// - <https://github.com/BurntSushi/jiff/issues/138>
+    /// - <https://github.com/BurntSushi/jiff/discussions/148>
+    #[test]
+    fn civil_date_deserialize_yaml() {
+        let expected = date(2024, 10, 31);
+
+        let deserialized: Date = serde_yml::from_str("2024-10-31").unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let deserialized: Date =
+            serde_yml::from_slice("2024-10-31".as_bytes()).unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let cursor = Cursor::new(b"2024-10-31");
+        let deserialized: Date = serde_yml::from_reader(cursor).unwrap();
+
+        assert_eq!(deserialized, expected);
+    }
 }

src/civil/datetime.rs

@@ -4134,6 +4134,8 @@ impl DateTimeWith {
 
 #[cfg(test)]
 mod tests {
+    use std::io::Cursor;
+
     use crate::{
         civil::{date, time},
         RoundMode, ToSpan, Unit,
@@ -4277,4 +4279,32 @@ mod tests {
             assert_eq!(12, core::mem::size_of::<DateTime>());
         }
     }
+
+    /// # `serde` deserializer compatibility test
+    ///
+    /// Serde YAML used to be unable to deserialize `jiff` types,
+    /// as deserializing from bytes is not supported by the deserializer.
+    ///
+    /// - <https://github.com/BurntSushi/jiff/issues/138>
+    /// - <https://github.com/BurntSushi/jiff/discussions/148>
+    #[test]
+    fn civil_datetime_deserialize_yaml() {
+        let expected = datetime(2024, 10, 31, 16, 33, 53, 123456789);
+
+        let deserialized: DateTime =
+            serde_yml::from_str("2024-10-31 16:33:53.123456789").unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let deserialized: DateTime =
+            serde_yml::from_slice("2024-10-31 16:33:53.123456789".as_bytes())
+                .unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let cursor = Cursor::new(b"2024-10-31 16:33:53.123456789");
+        let deserialized: DateTime = serde_yml::from_reader(cursor).unwrap();
+
+        assert_eq!(deserialized, expected);
+    }
 }

src/civil/time.rs

@@ -3144,6 +3144,8 @@ impl TimeWith {
 
 #[cfg(test)]
 mod tests {
+    use std::io::Cursor;
+
     use crate::{civil::time, ToSpan};
 
     use super::*;
@@ -3360,4 +3362,31 @@ mod tests {
         let expected = max.rem_euclid(t::NANOS_PER_CIVIL_DAY.bound());
         assert_eq!(got, expected);
     }
+
+    /// # `serde` deserializer compatibility test
+    ///
+    /// Serde YAML used to be unable to deserialize `jiff` types,
+    /// as deserializing from bytes is not supported by the deserializer.
+    ///
+    /// - <https://github.com/BurntSushi/jiff/issues/138>
+    /// - <https://github.com/BurntSushi/jiff/discussions/148>
+    #[test]
+    fn civil_time_deserialize_yaml() {
+        let expected = time(16, 35, 4, 987654321);
+
+        let deserialized: Time =
+            serde_yml::from_str("16:35:04.987654321").unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let deserialized: Time =
+            serde_yml::from_slice("16:35:04.987654321".as_bytes()).unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let cursor = Cursor::new(b"16:35:04.987654321");
+        let deserialized: Time = serde_yml::from_reader(cursor).unwrap();
+
+        assert_eq!(deserialized, expected);
+    }
 }

src/signed_duration.rs

@@ -2069,6 +2069,8 @@ impl<'de> serde::Deserialize<'de> for SignedDuration {
 
 #[cfg(test)]
 mod tests {
+    use std::io::Cursor;
+
     use super::*;
 
     #[test]
@@ -2186,4 +2188,32 @@ mod tests {
         assert_eq!(None, add((i64::MAX, 1), (0, 999_999_999)));
         assert_eq!(None, add((i64::MIN, -1), (0, -999_999_999)));
     }
+
+    /// # `serde` deserializer compatibility test
+    ///
+    /// Serde YAML used to be unable to deserialize `jiff` types,
+    /// as deserializing from bytes is not supported by the deserializer.
+    ///
+    /// - <https://github.com/BurntSushi/jiff/issues/138>
+    /// - <https://github.com/BurntSushi/jiff/discussions/148>
+    #[test]
+    fn signed_duration_deserialize_yaml() {
+        let expected = SignedDuration::from_secs(123456789);
+
+        let deserialized: SignedDuration =
+            serde_yml::from_str("PT34293h33m9s").unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let deserialized: SignedDuration =
+            serde_yml::from_slice("PT34293h33m9s".as_bytes()).unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let cursor = Cursor::new(b"PT34293h33m9s");
+        let deserialized: SignedDuration =
+            serde_yml::from_reader(cursor).unwrap();
+
+        assert_eq!(deserialized, expected);
+    }
 }

src/span.rs

@@ -5998,6 +5998,8 @@ fn clamp_relative_span(
 
 #[cfg(test)]
 mod tests {
+    use std::io::Cursor;
+
     use crate::{civil::date, RoundMode};
 
     use super::*;
@@ -6359,4 +6361,38 @@ mod tests {
             quickcheck::TestResult::from_bool(nanos == got.to_invariant_nanoseconds())
         }
     }
+
+    /// # `serde` deserializer compatibility test
+    ///
+    /// Serde YAML used to be unable to deserialize `jiff` types,
+    /// as deserializing from bytes is not supported by the deserializer.
+    ///
+    /// - <https://github.com/BurntSushi/jiff/issues/138>
+    /// - <https://github.com/BurntSushi/jiff/discussions/148>
+    #[test]
+    fn span_deserialize_yaml() {
+        let expected = Span::new()
+            .years(1)
+            .months(2)
+            .weeks(3)
+            .days(4)
+            .hours(5)
+            .minutes(6)
+            .seconds(7);
+
+        let deserialized: Span =
+            serde_yml::from_str("P1y2m3w4dT5h6m7s").unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let deserialized: Span =
+            serde_yml::from_slice("P1y2m3w4dT5h6m7s".as_bytes()).unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let cursor = Cursor::new(b"P1y2m3w4dT5h6m7s");
+        let deserialized: Span = serde_yml::from_reader(cursor).unwrap();
+
+        assert_eq!(deserialized, expected);
+    }
 }

src/timestamp.rs

@@ -3513,7 +3513,12 @@ impl From<(Unit, i64)> for TimestampRound {
 
 #[cfg(test)]
 mod tests {
-    use crate::{civil, tz::Offset};
+    use std::io::Cursor;
+
+    use crate::{
+        civil::{self, datetime},
+        tz::Offset,
+    };
 
     use super::*;
 
@@ -3687,4 +3692,39 @@ mod tests {
             t == got
         }
     }
+
+    /// # `serde` deserializer compatibility test
+    ///
+    /// Serde YAML used to be unable to deserialize `jiff` types,
+    /// as deserializing from bytes is not supported by the deserializer.
+    ///
+    /// - <https://github.com/BurntSushi/jiff/issues/138>
+    /// - <https://github.com/BurntSushi/jiff/discussions/148>
+    #[test]
+    fn timestamp_deserialize_yaml() {
+        let expected = datetime(2024, 10, 31, 16, 33, 53, 123456789)
+            .intz("Europe/Berlin")
+            .unwrap()
+            .timestamp();
+
+        let deserialized: Timestamp = serde_yml::from_str(
+            "2024-10-31T16:33:53.123456789+01:00[Europe/Berlin]",
+        )
+        .unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let deserialized: Timestamp = serde_yml::from_slice(
+            "2024-10-31T16:33:53.123456789+01:00[Europe/Berlin]".as_bytes(),
+        )
+        .unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let cursor =
+            Cursor::new(b"2024-10-31T16:33:53.123456789+01:00[Europe/Berlin]");
+        let deserialized: Timestamp = serde_yml::from_reader(cursor).unwrap();
+
+        assert_eq!(deserialized, expected);
+    }
 }

src/zoned.rs

@@ -5146,7 +5146,12 @@ fn day_length(
 
 #[cfg(test)]
 mod tests {
-    use crate::{civil::date, ToSpan};
+    use std::io::Cursor;
+
+    use crate::{
+        civil::{date, datetime},
+        ToSpan,
+    };
 
     use super::*;
 
@@ -5238,4 +5243,38 @@ mod tests {
             assert_eq!(40, core::mem::size_of::<Zoned>());
         }
     }
+
+    /// # `serde` deserializer compatibility test
+    ///
+    /// Serde YAML used to be unable to deserialize `jiff` types,
+    /// as deserializing from bytes is not supported by the deserializer.
+    ///
+    /// - <https://github.com/BurntSushi/jiff/issues/138>
+    /// - <https://github.com/BurntSushi/jiff/discussions/148>
+    #[test]
+    fn zoned_deserialize_yaml() {
+        let expected = datetime(2024, 10, 31, 16, 33, 53, 123456789)
+            .intz("Europe/Berlin")
+            .unwrap();
+
+        let deserialized: Zoned = serde_yml::from_str(
+            "2024-10-31T16:33:53.123456789+01:00[Europe/Berlin]",
+        )
+        .unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let deserialized: Zoned = serde_yml::from_slice(
+            "2024-10-31T16:33:53.123456789+01:00[Europe/Berlin]".as_bytes(),
+        )
+        .unwrap();
+
+        assert_eq!(deserialized, expected);
+
+        let cursor =
+            Cursor::new(b"2024-10-31T16:33:53.123456789+01:00[Europe/Berlin]");
+        let deserialized: Zoned = serde_yml::from_reader(cursor).unwrap();
+
+        assert_eq!(deserialized, expected);
+    }
 }