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6adfdc56e5
serde/test_suite/tests/test_annotations.rs
David Tolnay 93bb9e147c
Resolve manual_let_else clippy lints 
error: this could be rewritten as `let...else`
        --> test_suite/tests/test_annotations.rs:1247:5
         |
    1247 | /     let f1 = match pieces.next() {
    1248 | |         Some(x) => x,
    1249 | |         None => return Err(de::Error::invalid_length(0, &"2")),
    1250 | |     };
         | |______^ help: consider writing: `let Some(x) = pieces.next() else { return Err(de::Error::invalid_length(0, &"2")) };`
         |
         = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_let_else
         = note: `-D clippy::manual-let-else` implied by `-D clippy::pedantic`

    error: this could be rewritten as `let...else`
        --> test_suite/tests/test_annotations.rs:1251:5
         |
    1251 | /     let f2 = match pieces.next() {
    1252 | |         Some(x) => x,
    1253 | |         None => return Err(de::Error::invalid_length(1, &"2")),
    1254 | |     };
         | |______^ help: consider writing: `let Some(x) = pieces.next() else { return Err(de::Error::invalid_length(1, &"2")) };`
         |
         = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_let_else

    error: this could be rewritten as `let...else`
        --> test_suite/tests/test_annotations.rs:1255:5
         |
    1255 | /     let f2 = match f2.parse() {
    1256 | |         Ok(n) => n,
    1257 | |         Err(_) => {
    1258 | |             return Err(de::Error::invalid_value(
    ...    |
    1262 | |         }
    1263 | |     };
         | |______^
         |
         = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_let_else
    help: consider writing
         |
    1255 ~     let Ok(n) = f2.parse() else {
    1256 +             return Err(de::Error::invalid_value(
    1257 +                 Unexpected::Str(f2),
    1258 +                 &"an 8-bit signed integer",
    1259 +             ));
    1260 +         };
         |
2022-11-22 18:45:27 -08:00

2827 lines
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#![allow(
clippy::cast_lossless,
clippy::derive_partial_eq_without_eq,
clippy::from_over_into,
// Clippy bug: https://github.com/rust-lang/rust-clippy/issues/7422
clippy::nonstandard_macro_braces,
clippy::too_many_lines,
clippy::trivially_copy_pass_by_ref,
clippy::type_repetition_in_bounds
)]
use serde::de::{self, MapAccess, Unexpected, Visitor};
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use std::collections::{BTreeMap, HashMap};
use std::convert::TryFrom;
use std::fmt;
use std::marker::PhantomData;
use serde_test::{
assert_de_tokens, assert_de_tokens_error, assert_ser_tokens, assert_ser_tokens_error,
assert_tokens, Token,
};
trait MyDefault: Sized {
fn my_default() -> Self;
}
trait ShouldSkip: Sized {
fn should_skip(&self) -> bool;
}
trait SerializeWith: Sized {
fn serialize_with<S>(&self, ser: S) -> Result<S::Ok, S::Error>
where
S: Serializer;
}
trait DeserializeWith: Sized {
fn deserialize_with<'de, D>(de: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>;
}
impl MyDefault for i32 {
fn my_default() -> Self {
123
}
}
impl ShouldSkip for i32 {
fn should_skip(&self) -> bool {
*self == 123
}
}
impl SerializeWith for i32 {
fn serialize_with<S>(&self, ser: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
if *self == 123 {
true.serialize(ser)
} else {
false.serialize(ser)
}
}
}
impl DeserializeWith for i32 {
fn deserialize_with<'de, D>(de: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
if Deserialize::deserialize(de)? {
Ok(123)
} else {
Ok(2)
}
}
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct DefaultStruct<A, B, C, D, E>
where
C: MyDefault,
E: MyDefault,
{
a1: A,
#[serde(default)]
a2: B,
#[serde(default = "MyDefault::my_default")]
a3: C,
#[serde(skip_deserializing)]
a4: D,
#[serde(skip_deserializing, default = "MyDefault::my_default")]
a5: E,
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct DefaultTupleStruct<A, B, C>(
A,
#[serde(default)] B,
#[serde(default = "MyDefault::my_default")] C,
)
where
C: MyDefault;
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct CollectOther {
a: u32,
b: u32,
#[serde(flatten)]
extra: HashMap<String, u32>,
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct FlattenStructEnumWrapper {
#[serde(flatten)]
data: FlattenStructEnum,
#[serde(flatten)]
extra: HashMap<String, String>,
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
enum FlattenStructEnum {
InsertInteger { index: u32, value: u32 },
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct FlattenStructTagContentEnumWrapper {
outer: u32,
#[serde(flatten)]
data: FlattenStructTagContentEnumNewtype,
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct FlattenStructTagContentEnumNewtype(pub FlattenStructTagContentEnum);
#[derive(Debug, PartialEq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case", tag = "type", content = "value")]
enum FlattenStructTagContentEnum {
InsertInteger { index: u32, value: u32 },
NewtypeVariant(FlattenStructTagContentEnumNewtypeVariant),
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct FlattenStructTagContentEnumNewtypeVariant {
value: u32,
}
#[test]
fn test_default_struct() {
assert_de_tokens(
&DefaultStruct {
a1: 1,
a2: 2,
a3: 3,
a4: 0,
a5: 123,
},
&[
Token::Struct {
name: "DefaultStruct",
len: 3,
},
Token::Str("a1"),
Token::I32(1),
Token::Str("a2"),
Token::I32(2),
Token::Str("a3"),
Token::I32(3),
Token::Str("a4"),
Token::I32(4),
Token::Str("a5"),
Token::I32(5),
Token::StructEnd,
],
);
assert_de_tokens(
&DefaultStruct {
a1: 1,
a2: 0,
a3: 123,
a4: 0,
a5: 123,
},
&[
Token::Struct {
name: "DefaultStruct",
len: 3,
},
Token::Str("a1"),
Token::I32(1),
Token::StructEnd,
],
);
}
#[test]
fn test_default_tuple() {
assert_de_tokens(
&DefaultTupleStruct(1, 2, 3),
&[
Token::TupleStruct {
name: "DefaultTupleStruct",
len: 3,
},
Token::I32(1),
Token::I32(2),
Token::I32(3),
Token::TupleStructEnd,
],
);
assert_de_tokens(
&DefaultTupleStruct(1, 0, 123),
&[
Token::TupleStruct {
name: "DefaultTupleStruct",
len: 3,
},
Token::I32(1),
Token::TupleStructEnd,
],
);
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
enum DefaultStructVariant<A, B, C, D, E>
where
C: MyDefault,
E: MyDefault,
{
Struct {
a1: A,
#[serde(default)]
a2: B,
#[serde(default = "MyDefault::my_default")]
a3: C,
#[serde(skip_deserializing)]
a4: D,
#[serde(skip_deserializing, default = "MyDefault::my_default")]
a5: E,
},
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
enum DefaultTupleVariant<A, B, C>
where
C: MyDefault,
{
Tuple(
A,
#[serde(default)] B,
#[serde(default = "MyDefault::my_default")] C,
),
}
#[test]
fn test_default_struct_variant() {
assert_de_tokens(
&DefaultStructVariant::Struct {
a1: 1,
a2: 2,
a3: 3,
a4: 0,
a5: 123,
},
&[
Token::StructVariant {
name: "DefaultStructVariant",
variant: "Struct",
len: 3,
},
Token::Str("a1"),
Token::I32(1),
Token::Str("a2"),
Token::I32(2),
Token::Str("a3"),
Token::I32(3),
Token::Str("a4"),
Token::I32(4),
Token::Str("a5"),
Token::I32(5),
Token::StructVariantEnd,
],
);
assert_de_tokens(
&DefaultStructVariant::Struct {
a1: 1,
a2: 0,
a3: 123,
a4: 0,
a5: 123,
},
&[
Token::StructVariant {
name: "DefaultStructVariant",
variant: "Struct",
len: 3,
},
Token::Str("a1"),
Token::I32(1),
Token::StructVariantEnd,
],
);
}
#[test]
fn test_default_tuple_variant() {
assert_de_tokens(
&DefaultTupleVariant::Tuple(1, 2, 3),
&[
Token::TupleVariant {
name: "DefaultTupleVariant",
variant: "Tuple",
len: 3,
},
Token::I32(1),
Token::I32(2),
Token::I32(3),
Token::TupleVariantEnd,
],
);
assert_de_tokens(
&DefaultTupleVariant::Tuple(1, 0, 123),
&[
Token::TupleVariant {
name: "DefaultTupleVariant",
variant: "Tuple",
len: 3,
},
Token::I32(1),
Token::TupleVariantEnd,
],
);
}
// Does not implement std::default::Default.
#[derive(Debug, PartialEq, Deserialize)]
struct NoStdDefault(i8);
impl MyDefault for NoStdDefault {
fn my_default() -> Self {
NoStdDefault(123)
}
}
#[derive(Debug, PartialEq, Deserialize)]
struct ContainsNoStdDefault<A: MyDefault> {
#[serde(default = "MyDefault::my_default")]
a: A,
}
// Tests that a struct field does not need to implement std::default::Default if
// it is annotated with `default=...`.
#[test]
fn test_no_std_default() {
assert_de_tokens(
&ContainsNoStdDefault {
a: NoStdDefault(123),
},
&[
Token::Struct {
name: "ContainsNoStdDefault",
len: 1,
},
Token::StructEnd,
],
);
assert_de_tokens(
&ContainsNoStdDefault { a: NoStdDefault(8) },
&[
Token::Struct {
name: "ContainsNoStdDefault",
len: 1,
},
Token::Str("a"),
Token::NewtypeStruct {
name: "NoStdDefault",
},
Token::I8(8),
Token::StructEnd,
],
);
}
// Does not implement Deserialize.
#[derive(Debug, PartialEq)]
struct NotDeserializeStruct(i8);
impl Default for NotDeserializeStruct {
fn default() -> Self {
NotDeserializeStruct(123)
}
}
impl DeserializeWith for NotDeserializeStruct {
fn deserialize_with<'de, D>(_: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
panic!()
}
}
// Does not implement Deserialize.
#[derive(Debug, PartialEq)]
enum NotDeserializeEnum {
Trouble,
}
impl MyDefault for NotDeserializeEnum {
fn my_default() -> Self {
NotDeserializeEnum::Trouble
}
}
#[derive(Debug, PartialEq, Deserialize)]
struct ContainsNotDeserialize<A, B, C: DeserializeWith, E: MyDefault> {
#[serde(skip_deserializing)]
a: A,
#[serde(skip_deserializing, default)]
b: B,
#[serde(deserialize_with = "DeserializeWith::deserialize_with", default)]
c: C,
#[serde(skip_deserializing, default = "MyDefault::my_default")]
e: E,
}
// Tests that a struct field does not need to implement Deserialize if it is
// annotated with skip_deserializing, whether using the std Default or a
// custom default.
#[test]
fn test_elt_not_deserialize() {
assert_de_tokens(
&ContainsNotDeserialize {
a: NotDeserializeStruct(123),
b: NotDeserializeStruct(123),
c: NotDeserializeStruct(123),
e: NotDeserializeEnum::Trouble,
},
&[
Token::Struct {
name: "ContainsNotDeserialize",
len: 1,
},
Token::StructEnd,
],
);
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
struct DenyUnknown {
a1: i32,
}
#[test]
fn test_ignore_unknown() {
// 'Default' allows unknown. Basic smoke test of ignore...
assert_de_tokens(
&DefaultStruct {
a1: 1,
a2: 2,
a3: 3,
a4: 0,
a5: 123,
},
&[
Token::Struct {
name: "DefaultStruct",
len: 3,
},
Token::Str("whoops1"),
Token::I32(2),
Token::Str("a1"),
Token::I32(1),
Token::Str("whoops2"),
Token::Seq { len: Some(1) },
Token::I32(2),
Token::SeqEnd,
Token::Str("a2"),
Token::I32(2),
Token::Str("whoops3"),
Token::I32(2),
Token::Str("a3"),
Token::I32(3),
Token::StructEnd,
],
);
assert_de_tokens_error::<DenyUnknown>(
&[
Token::Struct {
name: "DenyUnknown",
len: 1,
},
Token::Str("a1"),
Token::I32(1),
Token::Str("whoops"),
],
"unknown field `whoops`, expected `a1`",
);
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
#[serde(rename = "Superhero")]
struct RenameStruct {
a1: i32,
#[serde(rename = "a3")]
a2: i32,
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
#[serde(rename(serialize = "SuperheroSer", deserialize = "SuperheroDe"))]
struct RenameStructSerializeDeserialize {
a1: i32,
#[serde(rename(serialize = "a4", deserialize = "a5"))]
a2: i32,
}
#[derive(Debug, PartialEq, Deserialize)]
#[serde(deny_unknown_fields)]
struct AliasStruct {
a1: i32,
#[serde(alias = "a3")]
a2: i32,
#[serde(alias = "a5", rename = "a6")]
a4: i32,
}
#[test]
fn test_rename_struct() {
assert_tokens(
&RenameStruct { a1: 1, a2: 2 },
&[
Token::Struct {
name: "Superhero",
len: 2,
},
Token::Str("a1"),
Token::I32(1),
Token::Str("a3"),
Token::I32(2),
Token::StructEnd,
],
);
assert_ser_tokens(
&RenameStructSerializeDeserialize { a1: 1, a2: 2 },
&[
Token::Struct {
name: "SuperheroSer",
len: 2,
},
Token::Str("a1"),
Token::I32(1),
Token::Str("a4"),
Token::I32(2),
Token::StructEnd,
],
);
assert_de_tokens(
&RenameStructSerializeDeserialize { a1: 1, a2: 2 },
&[
Token::Struct {
name: "SuperheroDe",
len: 2,
},
Token::Str("a1"),
Token::I32(1),
Token::Str("a5"),
Token::I32(2),
Token::StructEnd,
],
);
assert_de_tokens(
&AliasStruct {
a1: 1,
a2: 2,
a4: 3,
},
&[
Token::Struct {
name: "AliasStruct",
len: 3,
},
Token::Str("a1"),
Token::I32(1),
Token::Str("a2"),
Token::I32(2),
Token::Str("a5"),
Token::I32(3),
Token::StructEnd,
],
);
assert_de_tokens(
&AliasStruct {
a1: 1,
a2: 2,
a4: 3,
},
&[
Token::Struct {
name: "AliasStruct",
len: 3,
},
Token::Str("a1"),
Token::I32(1),
Token::Str("a3"),
Token::I32(2),
Token::Str("a6"),
Token::I32(3),
Token::StructEnd,
],
);
}
#[test]
fn test_unknown_field_rename_struct() {
assert_de_tokens_error::<AliasStruct>(
&[
Token::Struct {
name: "AliasStruct",
len: 3,
},
Token::Str("a1"),
Token::I32(1),
Token::Str("a3"),
Token::I32(2),
Token::Str("a4"),
Token::I32(3),
],
"unknown field `a4`, expected one of `a1`, `a2`, `a6`",
);
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
#[serde(rename = "Superhero")]
enum RenameEnum {
#[serde(rename = "bruce_wayne")]
Batman,
#[serde(rename = "clark_kent")]
Superman(i8),
#[serde(rename = "diana_prince")]
WonderWoman(i8, i8),
#[serde(rename = "barry_allan")]
Flash {
#[serde(rename = "b")]
a: i32,
},
}
#[derive(Debug, PartialEq, Deserialize, Serialize)]
#[serde(rename(serialize = "SuperheroSer", deserialize = "SuperheroDe"))]
enum RenameEnumSerializeDeserialize<A> {
#[serde(rename(serialize = "dick_grayson", deserialize = "jason_todd"))]
Robin {
a: i8,
#[serde(rename(serialize = "c"))]
#[serde(rename(deserialize = "d"))]
b: A,
},
}
#[derive(Debug, PartialEq, Deserialize)]
#[serde(deny_unknown_fields)]
enum AliasEnum {
#[serde(rename = "sailor_moon", alias = "usagi_tsukino")]
SailorMoon {
a: i8,
#[serde(alias = "c")]
b: i8,
#[serde(alias = "e", rename = "f")]
d: i8,
},
}
#[test]
fn test_rename_enum() {
assert_tokens(
&RenameEnum::Batman,
&[Token::UnitVariant {
name: "Superhero",
variant: "bruce_wayne",
}],
);
assert_tokens(
&RenameEnum::Superman(0),
&[
Token::NewtypeVariant {
name: "Superhero",
variant: "clark_kent",
},
Token::I8(0),
],
);
assert_tokens(
&RenameEnum::WonderWoman(0, 1),
&[
Token::TupleVariant {
name: "Superhero",
variant: "diana_prince",
len: 2,
},
Token::I8(0),
Token::I8(1),
Token::TupleVariantEnd,
],
);
assert_tokens(
&RenameEnum::Flash { a: 1 },
&[
Token::StructVariant {
name: "Superhero",
variant: "barry_allan",
len: 1,
},
Token::Str("b"),
Token::I32(1),
Token::StructVariantEnd,
],
);
assert_ser_tokens(
&RenameEnumSerializeDeserialize::Robin {
a: 0,
b: String::new(),
},
&[
Token::StructVariant {
name: "SuperheroSer",
variant: "dick_grayson",
len: 2,
},
Token::Str("a"),
Token::I8(0),
Token::Str("c"),
Token::Str(""),
Token::StructVariantEnd,
],
);
assert_de_tokens(
&RenameEnumSerializeDeserialize::Robin {
a: 0,
b: String::new(),
},
&[
Token::StructVariant {
name: "SuperheroDe",
variant: "jason_todd",
len: 2,
},
Token::Str("a"),
Token::I8(0),
Token::Str("d"),
Token::Str(""),
Token::StructVariantEnd,
],
);
assert_de_tokens(
&AliasEnum::SailorMoon { a: 0, b: 1, d: 2 },
&[
Token::StructVariant {
name: "AliasEnum",
variant: "sailor_moon",
len: 3,
},
Token::Str("a"),
Token::I8(0),
Token::Str("b"),
Token::I8(1),
Token::Str("e"),
Token::I8(2),
Token::StructVariantEnd,
],
);
assert_de_tokens(
&AliasEnum::SailorMoon { a: 0, b: 1, d: 2 },
&[
Token::StructVariant {
name: "AliasEnum",
variant: "usagi_tsukino",
len: 3,
},
Token::Str("a"),
Token::I8(0),
Token::Str("c"),
Token::I8(1),
Token::Str("f"),
Token::I8(2),
Token::StructVariantEnd,
],
);
}
#[test]
fn test_unknown_field_rename_enum() {
assert_de_tokens_error::<AliasEnum>(
&[Token::StructVariant {
name: "AliasEnum",
variant: "SailorMoon",
len: 3,
}],
"unknown variant `SailorMoon`, expected `sailor_moon`",
);
assert_de_tokens_error::<AliasEnum>(
&[
Token::StructVariant {
name: "AliasEnum",
variant: "usagi_tsukino",
len: 3,
},
Token::Str("a"),
Token::I8(0),
Token::Str("c"),
Token::I8(1),
Token::Str("d"),
Token::I8(2),
],
"unknown field `d`, expected one of `a`, `b`, `f`",
);
}
#[derive(Debug, PartialEq, Serialize)]
struct SkipSerializingStruct<'a, B, C>
where
C: ShouldSkip,
{
a: &'a i8,
#[serde(skip_serializing)]
b: B,
#[serde(skip_serializing_if = "ShouldSkip::should_skip")]
c: C,
}
#[test]
fn test_skip_serializing_struct() {
let a = 1;
assert_ser_tokens(
&SkipSerializingStruct { a: &a, b: 2, c: 3 },
&[
Token::Struct {
name: "SkipSerializingStruct",
len: 2,
},
Token::Str("a"),
Token::I8(1),
Token::Str("c"),
Token::I32(3),
Token::StructEnd,
],
);
assert_ser_tokens(
&SkipSerializingStruct {
a: &a,
b: 2,
c: 123,
},
&[
Token::Struct {
name: "SkipSerializingStruct",
len: 1,
},
Token::Str("a"),
Token::I8(1),
Token::StructEnd,
],
);
}
#[derive(Debug, PartialEq, Serialize)]
struct SkipSerializingTupleStruct<'a, B, C>(
&'a i8,
#[serde(skip_serializing)] B,
#[serde(skip_serializing_if = "ShouldSkip::should_skip")] C,
)
where
C: ShouldSkip;
#[test]
fn test_skip_serializing_tuple_struct() {
let a = 1;
assert_ser_tokens(
&SkipSerializingTupleStruct(&a, 2, 3),
&[
Token::TupleStruct {
name: "SkipSerializingTupleStruct",
len: 2,
},
Token::I8(1),
Token::I32(3),
Token::TupleStructEnd,
],
);
assert_ser_tokens(
&SkipSerializingTupleStruct(&a, 2, 123),
&[
Token::TupleStruct {
name: "SkipSerializingTupleStruct",
len: 1,
},
Token::I8(1),
Token::TupleStructEnd,
],
);
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct SkipStruct<B> {
a: i8,
#[serde(skip)]
b: B,
}
#[test]
fn test_skip_struct() {
assert_ser_tokens(
&SkipStruct { a: 1, b: 2 },
&[
Token::Struct {
name: "SkipStruct",
len: 1,
},
Token::Str("a"),
Token::I8(1),
Token::StructEnd,
],
);
assert_de_tokens(
&SkipStruct { a: 1, b: 0 },
&[
Token::Struct {
name: "SkipStruct",
len: 1,
},
Token::Str("a"),
Token::I8(1),
Token::StructEnd,
],
);
}
#[derive(Debug, PartialEq, Serialize)]
enum SkipSerializingEnum<'a, B, C>
where
C: ShouldSkip,
{
Struct {
a: &'a i8,
#[serde(skip_serializing)]
_b: B,
#[serde(skip_serializing_if = "ShouldSkip::should_skip")]
c: C,
},
Tuple(
&'a i8,
#[serde(skip_serializing)] B,
#[serde(skip_serializing_if = "ShouldSkip::should_skip")] C,
),
}
#[test]
fn test_skip_serializing_enum() {
let a = 1;
assert_ser_tokens(
&SkipSerializingEnum::Struct { a: &a, _b: 2, c: 3 },
&[
Token::StructVariant {
name: "SkipSerializingEnum",
variant: "Struct",
len: 2,
},
Token::Str("a"),
Token::I8(1),
Token::Str("c"),
Token::I32(3),
Token::StructVariantEnd,
],
);
assert_ser_tokens(
&SkipSerializingEnum::Struct {
a: &a,
_b: 2,
c: 123,
},
&[
Token::StructVariant {
name: "SkipSerializingEnum",
variant: "Struct",
len: 1,
},
Token::Str("a"),
Token::I8(1),
Token::StructVariantEnd,
],
);
assert_ser_tokens(
&SkipSerializingEnum::Tuple(&a, 2, 3),
&[
Token::TupleVariant {
name: "SkipSerializingEnum",
variant: "Tuple",
len: 2,
},
Token::I8(1),
Token::I32(3),
Token::TupleVariantEnd,
],
);
assert_ser_tokens(
&SkipSerializingEnum::Tuple(&a, 2, 123),
&[
Token::TupleVariant {
name: "SkipSerializingEnum",
variant: "Tuple",
len: 1,
},
Token::I8(1),
Token::TupleVariantEnd,
],
);
}
#[derive(Debug, PartialEq)]
struct NotSerializeStruct(i8);
#[derive(Debug, PartialEq)]
enum NotSerializeEnum {
Trouble,
}
impl SerializeWith for NotSerializeEnum {
fn serialize_with<S>(&self, ser: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
"trouble".serialize(ser)
}
}
#[derive(Debug, PartialEq, Serialize)]
struct ContainsNotSerialize<'a, B, C, D>
where
B: 'a,
D: SerializeWith,
{
a: &'a Option<i8>,
#[serde(skip_serializing)]
b: &'a B,
#[serde(skip_serializing)]
c: Option<C>,
#[serde(serialize_with = "SerializeWith::serialize_with")]
d: D,
}
#[test]
fn test_elt_not_serialize() {
let a = 1;
assert_ser_tokens(
&ContainsNotSerialize {
a: &Some(a),
b: &NotSerializeStruct(2),
c: Some(NotSerializeEnum::Trouble),
d: NotSerializeEnum::Trouble,
},
&[
Token::Struct {
name: "ContainsNotSerialize",
len: 2,
},
Token::Str("a"),
Token::Some,
Token::I8(1),
Token::Str("d"),
Token::Str("trouble"),
Token::StructEnd,
],
);
}
#[derive(Debug, PartialEq, Serialize)]
struct SerializeWithStruct<'a, B>
where
B: SerializeWith,
{
a: &'a i8,
#[serde(serialize_with = "SerializeWith::serialize_with")]
b: B,
}
#[test]
fn test_serialize_with_struct() {
let a = 1;
assert_ser_tokens(
&SerializeWithStruct { a: &a, b: 2 },
&[
Token::Struct {
name: "SerializeWithStruct",
len: 2,
},
Token::Str("a"),
Token::I8(1),
Token::Str("b"),
Token::Bool(false),
Token::StructEnd,
],
);
assert_ser_tokens(
&SerializeWithStruct { a: &a, b: 123 },
&[
Token::Struct {
name: "SerializeWithStruct",
len: 2,
},
Token::Str("a"),
Token::I8(1),
Token::Str("b"),
Token::Bool(true),
Token::StructEnd,
],
);
}
#[derive(Debug, PartialEq, Serialize)]
enum SerializeWithEnum<'a, B>
where
B: SerializeWith,
{
Struct {
a: &'a i8,
#[serde(serialize_with = "SerializeWith::serialize_with")]
b: B,
},
}
#[test]
fn test_serialize_with_enum() {
let a = 1;
assert_ser_tokens(
&SerializeWithEnum::Struct { a: &a, b: 2 },
&[
Token::StructVariant {
name: "SerializeWithEnum",
variant: "Struct",
len: 2,
},
Token::Str("a"),
Token::I8(1),
Token::Str("b"),
Token::Bool(false),
Token::StructVariantEnd,
],
);
assert_ser_tokens(
&SerializeWithEnum::Struct { a: &a, b: 123 },
&[
Token::StructVariant {
name: "SerializeWithEnum",
variant: "Struct",
len: 2,
},
Token::Str("a"),
Token::I8(1),
Token::Str("b"),
Token::Bool(true),
Token::StructVariantEnd,
],
);
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
enum WithVariant {
#[serde(serialize_with = "serialize_unit_variant_as_i8")]
#[serde(deserialize_with = "deserialize_i8_as_unit_variant")]
Unit,
#[serde(serialize_with = "SerializeWith::serialize_with")]
#[serde(deserialize_with = "DeserializeWith::deserialize_with")]
Newtype(i32),
#[serde(serialize_with = "serialize_variant_as_string")]
#[serde(deserialize_with = "deserialize_string_as_variant")]
Tuple(String, u8),
#[serde(serialize_with = "serialize_variant_as_string")]
#[serde(deserialize_with = "deserialize_string_as_variant")]
Struct { f1: String, f2: u8 },
}
fn serialize_unit_variant_as_i8<S>(serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_i8(0)
}
fn deserialize_i8_as_unit_variant<'de, D>(deserializer: D) -> Result<(), D::Error>
where
D: Deserializer<'de>,
{
let n = i8::deserialize(deserializer)?;
match n {
0 => Ok(()),
_ => Err(de::Error::invalid_value(Unexpected::Signed(n as i64), &"0")),
}
}
fn serialize_variant_as_string<S>(f1: &str, f2: &u8, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_str(format!("{f1};{f2:?}").as_str())
}
fn deserialize_string_as_variant<'de, D>(deserializer: D) -> Result<(String, u8), D::Error>
where
D: Deserializer<'de>,
{
let s = String::deserialize(deserializer)?;
let mut pieces = s.split(';');
let Some(f1) = pieces.next() else {
return Err(de::Error::invalid_length(0, &"2"));
};
let Some(f2) = pieces.next() else {
return Err(de::Error::invalid_length(1, &"2"));
};
let Ok(f2) = f2.parse() else {
return Err(de::Error::invalid_value(
Unexpected::Str(f2),
&"an 8-bit signed integer",
));
};
Ok((f1.into(), f2))
}
#[test]
fn test_serialize_with_variant() {
assert_ser_tokens(
&WithVariant::Unit,
&[
Token::NewtypeVariant {
name: "WithVariant",
variant: "Unit",
},
Token::I8(0),
],
);
assert_ser_tokens(
&WithVariant::Newtype(123),
&[
Token::NewtypeVariant {
name: "WithVariant",
variant: "Newtype",
},
Token::Bool(true),
],
);
assert_ser_tokens(
&WithVariant::Tuple("hello".into(), 0),
&[
Token::NewtypeVariant {
name: "WithVariant",
variant: "Tuple",
},
Token::Str("hello;0"),
],
);
assert_ser_tokens(
&WithVariant::Struct {
f1: "world".into(),
f2: 1,
},
&[
Token::NewtypeVariant {
name: "WithVariant",
variant: "Struct",
},
Token::Str("world;1"),
],
);
}
#[test]
fn test_deserialize_with_variant() {
assert_de_tokens(
&WithVariant::Unit,
&[
Token::NewtypeVariant {
name: "WithVariant",
variant: "Unit",
},
Token::I8(0),
],
);
assert_de_tokens(
&WithVariant::Newtype(123),
&[
Token::NewtypeVariant {
name: "WithVariant",
variant: "Newtype",
},
Token::Bool(true),
],
);
assert_de_tokens(
&WithVariant::Tuple("hello".into(), 0),
&[
Token::NewtypeVariant {
name: "WithVariant",
variant: "Tuple",
},
Token::Str("hello;0"),
],
);
assert_de_tokens(
&WithVariant::Struct {
f1: "world".into(),
f2: 1,
},
&[
Token::NewtypeVariant {
name: "WithVariant",
variant: "Struct",
},
Token::Str("world;1"),
],
);
}
#[derive(Debug, PartialEq, Deserialize)]
struct DeserializeWithStruct<B>
where
B: DeserializeWith,
{
a: i8,
#[serde(deserialize_with = "DeserializeWith::deserialize_with")]
b: B,
}
#[test]
fn test_deserialize_with_struct() {
assert_de_tokens(
&DeserializeWithStruct { a: 1, b: 2 },
&[
Token::Struct {
name: "DeserializeWithStruct",
len: 2,
},
Token::Str("a"),
Token::I8(1),
Token::Str("b"),
Token::Bool(false),
Token::StructEnd,
],
);
assert_de_tokens(
&DeserializeWithStruct { a: 1, b: 123 },
&[
Token::Struct {
name: "DeserializeWithStruct",
len: 2,
},
Token::Str("a"),
Token::I8(1),
Token::Str("b"),
Token::Bool(true),
Token::StructEnd,
],
);
}
#[derive(Debug, PartialEq, Deserialize)]
enum DeserializeWithEnum<B>
where
B: DeserializeWith,
{
Struct {
a: i8,
#[serde(deserialize_with = "DeserializeWith::deserialize_with")]
b: B,
},
}
#[test]
fn test_deserialize_with_enum() {
assert_de_tokens(
&DeserializeWithEnum::Struct { a: 1, b: 2 },
&[
Token::StructVariant {
name: "DeserializeWithEnum",
variant: "Struct",
len: 2,
},
Token::Str("a"),
Token::I8(1),
Token::Str("b"),
Token::Bool(false),
Token::StructVariantEnd,
],
);
assert_de_tokens(
&DeserializeWithEnum::Struct { a: 1, b: 123 },
&[
Token::StructVariant {
name: "DeserializeWithEnum",
variant: "Struct",
len: 2,
},
Token::Str("a"),
Token::I8(1),
Token::Str("b"),
Token::Bool(true),
Token::StructVariantEnd,
],
);
}
#[test]
fn test_missing_renamed_field_struct() {
assert_de_tokens_error::<RenameStruct>(
&[
Token::Struct {
name: "Superhero",
len: 2,
},
Token::Str("a1"),
Token::I32(1),
Token::StructEnd,
],
"missing field `a3`",
);
assert_de_tokens_error::<RenameStructSerializeDeserialize>(
&[
Token::Struct {
name: "SuperheroDe",
len: 2,
},
Token::Str("a1"),
Token::I32(1),
Token::StructEnd,
],
"missing field `a5`",
);
}
#[test]
fn test_missing_renamed_field_enum() {
assert_de_tokens_error::<RenameEnum>(
&[
Token::StructVariant {
name: "Superhero",
variant: "barry_allan",
len: 1,
},
Token::StructVariantEnd,
],
"missing field `b`",
);
assert_de_tokens_error::<RenameEnumSerializeDeserialize<i8>>(
&[
Token::StructVariant {
name: "SuperheroDe",
variant: "jason_todd",
len: 2,
},
Token::Str("a"),
Token::I8(0),
Token::StructVariantEnd,
],
"missing field `d`",
);
}
#[derive(Debug, PartialEq, Deserialize)]
enum InvalidLengthEnum {
A(i32, i32, i32),
B(#[serde(skip_deserializing)] i32, i32, i32),
}
#[test]
fn test_invalid_length_enum() {
assert_de_tokens_error::<InvalidLengthEnum>(
&[
Token::TupleVariant {
name: "InvalidLengthEnum",
variant: "A",
len: 3,
},
Token::I32(1),
Token::TupleVariantEnd,
],
"invalid length 1, expected tuple variant InvalidLengthEnum::A with 3 elements",
);
assert_de_tokens_error::<InvalidLengthEnum>(
&[
Token::TupleVariant {
name: "InvalidLengthEnum",
variant: "B",
len: 3,
},
Token::I32(1),
Token::TupleVariantEnd,
],
"invalid length 1, expected tuple variant InvalidLengthEnum::B with 2 elements",
);
}
#[derive(Clone, Serialize, Deserialize, PartialEq, Debug)]
#[serde(into = "EnumToU32", from = "EnumToU32")]
struct StructFromEnum(Option<u32>);
impl Into<EnumToU32> for StructFromEnum {
fn into(self) -> EnumToU32 {
match self {
StructFromEnum(v) => v.into(),
}
}
}
impl From<EnumToU32> for StructFromEnum {
fn from(v: EnumToU32) -> Self {
StructFromEnum(v.into())
}
}
#[derive(Clone, Serialize, Deserialize, PartialEq, Debug)]
#[serde(into = "Option<u32>", from = "Option<u32>")]
enum EnumToU32 {
One,
Two,
Three,
Four,
Nothing,
}
impl Into<Option<u32>> for EnumToU32 {
fn into(self) -> Option<u32> {
match self {
EnumToU32::One => Some(1),
EnumToU32::Two => Some(2),
EnumToU32::Three => Some(3),
EnumToU32::Four => Some(4),
EnumToU32::Nothing => None,
}
}
}
impl From<Option<u32>> for EnumToU32 {
fn from(v: Option<u32>) -> Self {
match v {
Some(1) => EnumToU32::One,
Some(2) => EnumToU32::Two,
Some(3) => EnumToU32::Three,
Some(4) => EnumToU32::Four,
_ => EnumToU32::Nothing,
}
}
}
#[derive(Clone, Deserialize, PartialEq, Debug)]
#[serde(try_from = "u32")]
enum TryFromU32 {
One,
Two,
}
impl TryFrom<u32> for TryFromU32 {
type Error = String;
fn try_from(value: u32) -> Result<Self, Self::Error> {
match value {
1 => Ok(TryFromU32::One),
2 => Ok(TryFromU32::Two),
_ => Err("out of range".to_owned()),
}
}
}
#[test]
fn test_from_into_traits() {
assert_ser_tokens(&EnumToU32::One, &[Token::Some, Token::U32(1)]);
assert_ser_tokens(&EnumToU32::Nothing, &[Token::None]);
assert_de_tokens(&EnumToU32::Two, &[Token::Some, Token::U32(2)]);
assert_ser_tokens(&StructFromEnum(Some(5)), &[Token::None]);
assert_ser_tokens(&StructFromEnum(None), &[Token::None]);
assert_de_tokens(&StructFromEnum(Some(2)), &[Token::Some, Token::U32(2)]);
assert_de_tokens(&TryFromU32::Two, &[Token::U32(2)]);
assert_de_tokens_error::<TryFromU32>(&[Token::U32(5)], "out of range");
}
#[test]
fn test_collect_other() {
let mut extra = HashMap::new();
extra.insert("c".into(), 3);
assert_tokens(
&CollectOther { a: 1, b: 2, extra },
&[
Token::Map { len: None },
Token::Str("a"),
Token::U32(1),
Token::Str("b"),
Token::U32(2),
Token::Str("c"),
Token::U32(3),
Token::MapEnd,
],
);
}
#[test]
fn test_flatten_struct_enum() {
let mut extra = HashMap::new();
extra.insert("extra_key".into(), "extra value".into());
let change_request = FlattenStructEnumWrapper {
data: FlattenStructEnum::InsertInteger {
index: 0,
value: 42,
},
extra,
};
assert_de_tokens(
&change_request,
&[
Token::Map { len: None },
Token::Str("insert_integer"),
Token::Map { len: None },
Token::Str("index"),
Token::U32(0),
Token::Str("value"),
Token::U32(42),
Token::MapEnd,
Token::Str("extra_key"),
Token::Str("extra value"),
Token::MapEnd,
],
);
assert_ser_tokens(
&change_request,
&[
Token::Map { len: None },
Token::Str("insert_integer"),
Token::Struct {
len: 2,
name: "insert_integer",
},
Token::Str("index"),
Token::U32(0),
Token::Str("value"),
Token::U32(42),
Token::StructEnd,
Token::Str("extra_key"),
Token::Str("extra value"),
Token::MapEnd,
],
);
}
#[test]
fn test_flatten_struct_tag_content_enum() {
let change_request = FlattenStructTagContentEnumWrapper {
outer: 42,
data: FlattenStructTagContentEnumNewtype(FlattenStructTagContentEnum::InsertInteger {
index: 0,
value: 42,
}),
};
assert_de_tokens(
&change_request,
&[
Token::Map { len: None },
Token::Str("outer"),
Token::U32(42),
Token::Str("type"),
Token::Str("insert_integer"),
Token::Str("value"),
Token::Map { len: None },
Token::Str("index"),
Token::U32(0),
Token::Str("value"),
Token::U32(42),
Token::MapEnd,
Token::MapEnd,
],
);
assert_ser_tokens(
&change_request,
&[
Token::Map { len: None },
Token::Str("outer"),
Token::U32(42),
Token::Str("type"),
Token::Str("insert_integer"),
Token::Str("value"),
Token::Struct {
len: 2,
name: "insert_integer",
},
Token::Str("index"),
Token::U32(0),
Token::Str("value"),
Token::U32(42),
Token::StructEnd,
Token::MapEnd,
],
);
}
#[test]
fn test_flatten_struct_tag_content_enum_newtype() {
let change_request = FlattenStructTagContentEnumWrapper {
outer: 42,
data: FlattenStructTagContentEnumNewtype(FlattenStructTagContentEnum::NewtypeVariant(
FlattenStructTagContentEnumNewtypeVariant { value: 23 },
)),
};
assert_de_tokens(
&change_request,
&[
Token::Map { len: None },
Token::Str("outer"),
Token::U32(42),
Token::Str("type"),
Token::Str("newtype_variant"),
Token::Str("value"),
Token::Map { len: None },
Token::Str("value"),
Token::U32(23),
Token::MapEnd,
Token::MapEnd,
],
);
assert_ser_tokens(
&change_request,
&[
Token::Map { len: None },
Token::Str("outer"),
Token::U32(42),
Token::Str("type"),
Token::Str("newtype_variant"),
Token::Str("value"),
Token::Struct {
len: 1,
name: "FlattenStructTagContentEnumNewtypeVariant",
},
Token::Str("value"),
Token::U32(23),
Token::StructEnd,
Token::MapEnd,
],
);
}
#[test]
fn test_unknown_field_in_flatten() {
#[derive(Debug, PartialEq, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
struct Outer {
dummy: String,
#[serde(flatten)]
inner: Inner,
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct Inner {
foo: HashMap<String, u32>,
}
assert_de_tokens_error::<Outer>(
&[
Token::Struct {
name: "Outer",
len: 1,
},
Token::Str("dummy"),
Token::Str("23"),
Token::Str("foo"),
Token::Map { len: None },
Token::Str("a"),
Token::U32(1),
Token::Str("b"),
Token::U32(2),
Token::MapEnd,
Token::Str("bar"),
Token::U32(23),
Token::StructEnd,
],
"unknown field `bar`",
);
}
#[test]
fn test_complex_flatten() {
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct Outer {
y: u32,
#[serde(flatten)]
first: First,
#[serde(flatten)]
second: Second,
z: u32,
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct First {
a: u32,
b: bool,
c: Vec<String>,
d: String,
e: Option<u64>,
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct Second {
f: u32,
}
assert_de_tokens(
&Outer {
y: 0,
first: First {
a: 1,
b: true,
c: vec!["a".into(), "b".into()],
d: "c".into(),
e: Some(2),
},
second: Second { f: 3 },
z: 4,
},
&[
Token::Map { len: None },
Token::Str("y"),
Token::U32(0),
Token::Str("a"),
Token::U32(1),
Token::Str("b"),
Token::Bool(true),
Token::Str("c"),
Token::Seq { len: Some(2) },
Token::Str("a"),
Token::Str("b"),
Token::SeqEnd,
Token::Str("d"),
Token::Str("c"),
Token::Str("e"),
Token::U64(2),
Token::Str("f"),
Token::U32(3),
Token::Str("z"),
Token::U32(4),
Token::MapEnd,
],
);
assert_ser_tokens(
&Outer {
y: 0,
first: First {
a: 1,
b: true,
c: vec!["a".into(), "b".into()],
d: "c".into(),
e: Some(2),
},
second: Second { f: 3 },
z: 4,
},
&[
Token::Map { len: None },
Token::Str("y"),
Token::U32(0),
Token::Str("a"),
Token::U32(1),
Token::Str("b"),
Token::Bool(true),
Token::Str("c"),
Token::Seq { len: Some(2) },
Token::Str("a"),
Token::Str("b"),
Token::SeqEnd,
Token::Str("d"),
Token::Str("c"),
Token::Str("e"),
Token::Some,
Token::U64(2),
Token::Str("f"),
Token::U32(3),
Token::Str("z"),
Token::U32(4),
Token::MapEnd,
],
);
}
#[test]
fn test_flatten_map_twice() {
#[derive(Debug, PartialEq, Deserialize)]
struct Outer {
#[serde(flatten)]
first: BTreeMap<String, String>,
#[serde(flatten)]
between: Inner,
#[serde(flatten)]
second: BTreeMap<String, String>,
}
#[derive(Debug, PartialEq, Deserialize)]
struct Inner {
y: String,
}
assert_de_tokens(
&Outer {
first: {
let mut first = BTreeMap::new();
first.insert("x".to_owned(), "X".to_owned());
first.insert("y".to_owned(), "Y".to_owned());
first
},
between: Inner { y: "Y".to_owned() },
second: {
let mut second = BTreeMap::new();
second.insert("x".to_owned(), "X".to_owned());
second
},
},
&[
Token::Map { len: None },
Token::Str("x"),
Token::Str("X"),
Token::Str("y"),
Token::Str("Y"),
Token::MapEnd,
],
);
}
#[test]
fn test_flatten_unit() {
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct Response<T> {
#[serde(flatten)]
data: T,
status: usize,
}
assert_tokens(
&Response {
data: (),
status: 0,
},
&[
Token::Map { len: None },
Token::Str("status"),
Token::U64(0),
Token::MapEnd,
],
);
}
#[test]
fn test_flatten_unsupported_type() {
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct Outer {
outer: String,
#[serde(flatten)]
inner: String,
}
assert_ser_tokens_error(
&Outer {
outer: "foo".into(),
inner: "bar".into(),
},
&[
Token::Map { len: None },
Token::Str("outer"),
Token::Str("foo"),
],
"can only flatten structs and maps (got a string)",
);
assert_de_tokens_error::<Outer>(
&[
Token::Map { len: None },
Token::Str("outer"),
Token::Str("foo"),
Token::Str("a"),
Token::Str("b"),
Token::MapEnd,
],
"can only flatten structs and maps",
);
}
#[test]
fn test_non_string_keys() {
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct TestStruct {
name: String,
age: u32,
#[serde(flatten)]
mapping: HashMap<u32, u32>,
}
let mut mapping = HashMap::new();
mapping.insert(0, 42);
assert_tokens(
&TestStruct {
name: "peter".into(),
age: 3,
mapping,
},
&[
Token::Map { len: None },
Token::Str("name"),
Token::Str("peter"),
Token::Str("age"),
Token::U32(3),
Token::U32(0),
Token::U32(42),
Token::MapEnd,
],
);
}
#[test]
fn test_lifetime_propagation_for_flatten() {
#[derive(Deserialize, Serialize, Debug, PartialEq)]
struct A<T> {
#[serde(flatten)]
t: T,
}
#[derive(Deserialize, Serialize, Debug, PartialEq)]
struct B<'a> {
#[serde(flatten, borrow)]
t: HashMap<&'a str, u32>,
}
#[derive(Deserialize, Serialize, Debug, PartialEq)]
struct C<'a> {
#[serde(flatten, borrow)]
t: HashMap<&'a [u8], u32>,
}
let mut owned_map = HashMap::new();
owned_map.insert("x".to_string(), 42u32);
assert_tokens(
&A { t: owned_map },
&[
Token::Map { len: None },
Token::Str("x"),
Token::U32(42),
Token::MapEnd,
],
);
let mut borrowed_map = HashMap::new();
borrowed_map.insert("x", 42u32);
assert_ser_tokens(
&B {
t: borrowed_map.clone(),
},
&[
Token::Map { len: None },
Token::BorrowedStr("x"),
Token::U32(42),
Token::MapEnd,
],
);
assert_de_tokens(
&B { t: borrowed_map },
&[
Token::Map { len: None },
Token::BorrowedStr("x"),
Token::U32(42),
Token::MapEnd,
],
);
let mut borrowed_map = HashMap::new();
borrowed_map.insert(&b"x"[..], 42u32);
assert_ser_tokens(
&C {
t: borrowed_map.clone(),
},
&[
Token::Map { len: None },
Token::Seq { len: Some(1) },
Token::U8(120),
Token::SeqEnd,
Token::U32(42),
Token::MapEnd,
],
);
assert_de_tokens(
&C { t: borrowed_map },
&[
Token::Map { len: None },
Token::BorrowedBytes(b"x"),
Token::U32(42),
Token::MapEnd,
],
);
}
#[test]
fn test_flatten_enum_newtype() {
#[derive(Serialize, Deserialize, PartialEq, Debug)]
struct S {
#[serde(flatten)]
flat: E,
}
#[derive(Serialize, Deserialize, PartialEq, Debug)]
enum E {
Q(HashMap<String, String>),
}
let e = E::Q({
let mut map = HashMap::new();
map.insert("k".to_owned(), "v".to_owned());
map
});
let s = S { flat: e };
assert_tokens(
&s,
&[
Token::Map { len: None },
Token::Str("Q"),
Token::Map { len: Some(1) },
Token::Str("k"),
Token::Str("v"),
Token::MapEnd,
Token::MapEnd,
],
);
}
#[test]
fn test_flatten_internally_tagged() {
#[derive(Serialize, Deserialize, PartialEq, Debug)]
struct S {
#[serde(flatten)]
x: X,
#[serde(flatten)]
y: Y,
}
#[derive(Serialize, Deserialize, PartialEq, Debug)]
#[serde(tag = "typeX")]
enum X {
A { a: i32 },
B { b: i32 },
}
#[derive(Serialize, Deserialize, PartialEq, Debug)]
#[serde(tag = "typeY")]
enum Y {
C { c: i32 },
D { d: i32 },
}
let s = S {
x: X::B { b: 1 },
y: Y::D { d: 2 },
};
assert_tokens(
&s,
&[
Token::Map { len: None },
Token::Str("typeX"),
Token::Str("B"),
Token::Str("b"),
Token::I32(1),
Token::Str("typeY"),
Token::Str("D"),
Token::Str("d"),
Token::I32(2),
Token::MapEnd,
],
);
}
#[test]
fn test_externally_tagged_enum_containing_flatten() {
#[derive(Serialize, Deserialize, PartialEq, Debug)]
enum Data {
A {
a: i32,
#[serde(flatten)]
flat: Flat,
},
}
#[derive(Serialize, Deserialize, PartialEq, Debug)]
struct Flat {
b: i32,
}
let data = Data::A {
a: 0,
flat: Flat { b: 0 },
};
assert_tokens(
&data,
&[
Token::NewtypeVariant {
name: "Data",
variant: "A",
},
Token::Map { len: None },
Token::Str("a"),
Token::I32(0),
Token::Str("b"),
Token::I32(0),
Token::MapEnd,
],
);
}
#[test]
fn test_internally_tagged_enum_containing_flatten() {
#[derive(Serialize, Deserialize, PartialEq, Debug)]
#[serde(tag = "t")]
enum Data {
A {
a: i32,
#[serde(flatten)]
flat: Flat,
},
}
#[derive(Serialize, Deserialize, PartialEq, Debug)]
struct Flat {
b: i32,
}
let data = Data::A {
a: 0,
flat: Flat { b: 0 },
};
assert_tokens(
&data,
&[
Token::Map { len: None },
Token::Str("t"),
Token::Str("A"),
Token::Str("a"),
Token::I32(0),
Token::Str("b"),
Token::I32(0),
Token::MapEnd,
],
);
}
#[test]
fn test_internally_tagged_enum_new_type_with_unit() {
#[derive(Serialize, Deserialize, PartialEq, Debug)]
#[serde(tag = "t")]
enum Data {
A(()),
}
assert_tokens(
&Data::A(()),
&[
Token::Map { len: Some(1) },
Token::Str("t"),
Token::Str("A"),
Token::MapEnd,
],
);
}
#[test]
fn test_adjacently_tagged_enum_containing_flatten() {
#[derive(Serialize, Deserialize, PartialEq, Debug)]
#[serde(tag = "t", content = "c")]
enum Data {
A {
a: i32,
#[serde(flatten)]
flat: Flat,
},
}
#[derive(Serialize, Deserialize, PartialEq, Debug)]
struct Flat {
b: i32,
}
let data = Data::A {
a: 0,
flat: Flat { b: 0 },
};
assert_tokens(
&data,
&[
Token::Struct {
name: "Data",
len: 2,
},
Token::Str("t"),
Token::Str("A"),
Token::Str("c"),
Token::Map { len: None },
Token::Str("a"),
Token::I32(0),
Token::Str("b"),
Token::I32(0),
Token::MapEnd,
Token::StructEnd,
],
);
}
#[test]
fn test_untagged_enum_containing_flatten() {
#[derive(Serialize, Deserialize, PartialEq, Debug)]
#[serde(untagged)]
enum Data {
A {
a: i32,
#[serde(flatten)]
flat: Flat,
},
}
#[derive(Serialize, Deserialize, PartialEq, Debug)]
struct Flat {
b: i32,
}
let data = Data::A {
a: 0,
flat: Flat { b: 0 },
};
assert_tokens(
&data,
&[
Token::Map { len: None },
Token::Str("a"),
Token::I32(0),
Token::Str("b"),
Token::I32(0),
Token::MapEnd,
],
);
}
#[test]
fn test_flatten_untagged_enum() {
#[derive(Serialize, Deserialize, PartialEq, Debug)]
struct Outer {
#[serde(flatten)]
inner: Inner,
}
#[derive(Serialize, Deserialize, PartialEq, Debug)]
#[serde(untagged)]
enum Inner {
Variant { a: i32 },
}
let data = Outer {
inner: Inner::Variant { a: 0 },
};
assert_tokens(
&data,
&[
Token::Map { len: None },
Token::Str("a"),
Token::I32(0),
Token::MapEnd,
],
);
}
#[test]
fn test_flatten_option() {
#[derive(Serialize, Deserialize, PartialEq, Debug)]
struct Outer {
#[serde(flatten)]
inner1: Option<Inner1>,
#[serde(flatten)]
inner2: Option<Inner2>,
}
#[derive(Serialize, Deserialize, PartialEq, Debug)]
struct Inner1 {
inner1: i32,
}
#[derive(Serialize, Deserialize, PartialEq, Debug)]
struct Inner2 {
inner2: i32,
}
assert_tokens(
&Outer {
inner1: Some(Inner1 { inner1: 1 }),
inner2: Some(Inner2 { inner2: 2 }),
},
&[
Token::Map { len: None },
Token::Str("inner1"),
Token::I32(1),
Token::Str("inner2"),
Token::I32(2),
Token::MapEnd,
],
);
assert_tokens(
&Outer {
inner1: Some(Inner1 { inner1: 1 }),
inner2: None,
},
&[
Token::Map { len: None },
Token::Str("inner1"),
Token::I32(1),
Token::MapEnd,
],
);
assert_tokens(
&Outer {
inner1: None,
inner2: Some(Inner2 { inner2: 2 }),
},
&[
Token::Map { len: None },
Token::Str("inner2"),
Token::I32(2),
Token::MapEnd,
],
);
assert_tokens(
&Outer {
inner1: None,
inner2: None,
},
&[Token::Map { len: None }, Token::MapEnd],
);
}
#[test]
fn test_transparent_struct() {
#[derive(Serialize, Deserialize, PartialEq, Debug)]
#[serde(transparent)]
struct Transparent {
#[serde(skip)]
a: bool,
b: u32,
#[serde(skip)]
c: bool,
d: PhantomData<()>,
}
assert_tokens(
&Transparent {
a: false,
b: 1,
c: false,
d: PhantomData,
},
&[Token::U32(1)],
);
}
#[test]
fn test_transparent_tuple_struct() {
#[derive(Serialize, Deserialize, PartialEq, Debug)]
#[serde(transparent)]
struct Transparent(
#[serde(skip)] bool,
u32,
#[serde(skip)] bool,
PhantomData<()>,
);
assert_tokens(&Transparent(false, 1, false, PhantomData), &[Token::U32(1)]);
}
#[test]
fn test_internally_tagged_unit_enum_with_unknown_fields() {
#[derive(Deserialize, PartialEq, Debug)]
#[serde(tag = "t")]
enum Data {
A,
}
let data = Data::A;
assert_de_tokens(
&data,
&[
Token::Map { len: None },
Token::Str("t"),
Token::Str("A"),
Token::Str("b"),
Token::I32(0),
Token::MapEnd,
],
);
}
#[test]
fn test_flattened_internally_tagged_unit_enum_with_unknown_fields() {
#[derive(Deserialize, PartialEq, Debug)]
struct S {
#[serde(flatten)]
x: X,
#[serde(flatten)]
y: Y,
}
#[derive(Deserialize, PartialEq, Debug)]
#[serde(tag = "typeX")]
enum X {
A,
}
#[derive(Deserialize, PartialEq, Debug)]
#[serde(tag = "typeY")]
enum Y {
B { c: u32 },
}
let s = S {
x: X::A,
y: Y::B { c: 0 },
};
assert_de_tokens(
&s,
&[
Token::Map { len: None },
Token::Str("typeX"),
Token::Str("A"),
Token::Str("typeY"),
Token::Str("B"),
Token::Str("c"),
Token::I32(0),
Token::MapEnd,
],
);
}
#[test]
fn test_flatten_any_after_flatten_struct() {
#[derive(PartialEq, Debug)]
struct Any;
impl<'de> Deserialize<'de> for Any {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
struct AnyVisitor;
impl<'de> Visitor<'de> for AnyVisitor {
type Value = Any;
fn expecting(&self, _formatter: &mut fmt::Formatter) -> fmt::Result {
unimplemented!()
}
fn visit_map<M>(self, mut map: M) -> Result<Self::Value, M::Error>
where
M: MapAccess<'de>,
{
while let Some((Any, Any)) = map.next_entry()? {}
Ok(Any)
}
}
deserializer.deserialize_any(AnyVisitor)
}
}
#[derive(Deserialize, PartialEq, Debug)]
struct Outer {
#[serde(flatten)]
inner: Inner,
#[serde(flatten)]
extra: Any,
}
#[derive(Deserialize, PartialEq, Debug)]
struct Inner {
inner: i32,
}
let s = Outer {
inner: Inner { inner: 0 },
extra: Any,
};
assert_de_tokens(
&s,
&[
Token::Map { len: None },
Token::Str("inner"),
Token::I32(0),
Token::MapEnd,
],
);
}
#[test]
fn test_expecting_message() {
#[derive(Deserialize, PartialEq, Debug)]
#[serde(expecting = "something strange...")]
struct Unit;
#[derive(Deserialize)]
#[serde(expecting = "something strange...")]
struct Newtype(bool);
#[derive(Deserialize)]
#[serde(expecting = "something strange...")]
struct Tuple(u32, bool);
#[derive(Deserialize)]
#[serde(expecting = "something strange...")]
struct Struct {
question: String,
answer: u32,
}
assert_de_tokens_error::<Unit>(
&[Token::Str("Unit")],
r#"invalid type: string "Unit", expected something strange..."#,
);
assert_de_tokens_error::<Newtype>(
&[Token::Str("Newtype")],
r#"invalid type: string "Newtype", expected something strange..."#,
);
assert_de_tokens_error::<Tuple>(
&[Token::Str("Tuple")],
r#"invalid type: string "Tuple", expected something strange..."#,
);
assert_de_tokens_error::<Struct>(
&[Token::Str("Struct")],
r#"invalid type: string "Struct", expected something strange..."#,
);
}
#[test]
fn test_expecting_message_externally_tagged_enum() {
#[derive(Deserialize)]
#[serde(expecting = "something strange...")]
enum Enum {
ExternallyTagged,
}
assert_de_tokens_error::<Enum>(
&[Token::Str("ExternallyTagged")],
r#"invalid type: string "ExternallyTagged", expected something strange..."#,
);
// Check that #[serde(expecting = "...")] doesn't affect variant identifier error message
assert_de_tokens_error::<Enum>(
&[Token::Enum { name: "Enum" }, Token::Unit],
r#"invalid type: unit value, expected variant identifier"#,
);
}
#[test]
fn test_expecting_message_internally_tagged_enum() {
#[derive(Deserialize)]
#[serde(tag = "tag")]
#[serde(expecting = "something strange...")]
enum Enum {
InternallyTagged,
}
assert_de_tokens_error::<Enum>(
&[Token::Str("InternallyTagged")],
r#"invalid type: string "InternallyTagged", expected something strange..."#,
);
// Check that #[serde(expecting = "...")] doesn't affect variant identifier error message
assert_de_tokens_error::<Enum>(
&[Token::Map { len: None }, Token::Str("tag"), Token::Unit],
r#"invalid type: unit value, expected variant identifier"#,
);
}
#[test]
fn test_expecting_message_adjacently_tagged_enum() {
#[derive(Deserialize)]
#[serde(tag = "tag", content = "content")]
#[serde(expecting = "something strange...")]
enum Enum {
AdjacentlyTagged,
}
assert_de_tokens_error::<Enum>(
&[Token::Str("AdjacentlyTagged")],
r#"invalid type: string "AdjacentlyTagged", expected something strange..."#,
);
assert_de_tokens_error::<Enum>(
&[Token::Map { len: None }, Token::Unit],
r#"invalid type: unit value, expected "tag", "content", or other ignored fields"#,
);
// Check that #[serde(expecting = "...")] doesn't affect variant identifier error message
assert_de_tokens_error::<Enum>(
&[Token::Map { len: None }, Token::Str("tag"), Token::Unit],
r#"invalid type: unit value, expected variant identifier"#,
);
}
#[test]
fn test_expecting_message_untagged_tagged_enum() {
#[derive(Deserialize)]
#[serde(untagged)]
#[serde(expecting = "something strange...")]
enum Enum {
Untagged,
}
assert_de_tokens_error::<Enum>(&[Token::Str("Untagged")], r#"something strange..."#);
}
#[test]
fn test_expecting_message_identifier_enum() {
#[derive(Deserialize)]
#[serde(field_identifier)]
#[serde(expecting = "something strange...")]
enum FieldEnum {
Field,
}
#[derive(Deserialize)]
#[serde(variant_identifier)]
#[serde(expecting = "something strange...")]
enum VariantEnum {
Variant,
}
assert_de_tokens_error::<FieldEnum>(
&[Token::Unit],
r#"invalid type: unit value, expected something strange..."#,
);
assert_de_tokens_error::<FieldEnum>(
&[
Token::Enum { name: "FieldEnum" },
Token::Str("Unknown"),
Token::None,
],
r#"invalid type: map, expected something strange..."#,
);
assert_de_tokens_error::<VariantEnum>(
&[Token::Unit],
r#"invalid type: unit value, expected something strange..."#,
);
assert_de_tokens_error::<VariantEnum>(
&[
Token::Enum {
name: "VariantEnum",
},
Token::Str("Unknown"),
Token::None,
],
r#"invalid type: map, expected something strange..."#,
);
}
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