47 lines
1.5 KiB
Rust
47 lines
1.5 KiB
Rust
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use serde::{Deserialize, Serialize, Serializer};
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use serde_test::{assert_ser_tokens_error, Token};
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use time::macros::{datetime, format_description};
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use time::{error, OffsetDateTime};
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/// Trigger `time::error::Format::StdIo` errors.
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///
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/// `StdIo` won't be reached during normal serde operation: it's instantiated
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/// only during calls to `format_into()`, but most `Serializable`
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/// implementations will only call `format()` because serde `Serializer`
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/// interface doesn't expose the underlying `io::Write`.
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///
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/// Therefore, we need a contrived serializer to trigger coverage.
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fn serialize<S: Serializer>(datetime: &OffsetDateTime, _serializer: S) -> Result<S::Ok, S::Error> {
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Err(datetime
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.format_into(
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&mut [0u8; 0].as_mut_slice(),
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format_description!("nonempty format description"),
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)
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.map_err(error::Format::into_invalid_serde_value::<S>)
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.expect_err("Writing to a zero-length buffer should always error."))
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}
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#[derive(Serialize, Deserialize, Debug, Eq, PartialEq)]
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struct TestBadIo {
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#[serde(serialize_with = "serialize")]
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dt: OffsetDateTime,
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}
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#[test]
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fn custom_serialize_io_error() {
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let value = TestBadIo {
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dt: datetime!(2000-01-01 00:00 -4:00),
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};
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assert_ser_tokens_error::<TestBadIo>(
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&value,
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&[
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Token::Struct {
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name: "TestBadIo",
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len: 1,
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},
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Token::Str("dt"),
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],
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"failed to write whole buffer",
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);
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}
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