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//! Struct size regression guard (L-05).
//!
//! Asserts that key identifier newtypes stay within expected memory bounds.
//! These sizes are recorded at the time they were designed and serve as a
//! regression guard against accidental bloat from future field additions.
//!
//! **Platform note**: sizes are for 64-bit targets (pointer width = 8 bytes).
//! On 32-bit targets the tests are skipped via `#[cfg(target_pointer_width = "64")]`.
#[cfg(target_pointer_width = "64")]
mod identifier_sizes {
use rubo4e::identifiers::*;
use std::mem::size_of;
/// All identifier newtypes are a single `Box<str>` = 2 × pointer = 16 bytes.
const BOX_STR: usize = 16;
#[test]
fn malo_id_size() {
assert_eq!(size_of::<MaloId>(), BOX_STR, "MaloId should be 16 bytes");
}
#[test]
fn melo_id_size() {
assert_eq!(size_of::<MeloId>(), BOX_STR, "MeloId should be 16 bytes");
}
#[test]
fn nelo_id_size() {
assert_eq!(size_of::<NeloId>(), BOX_STR, "NeloId should be 16 bytes");
}
#[test]
fn sr_id_size() {
assert_eq!(size_of::<SrId>(), BOX_STR, "SrId should be 16 bytes");
}
#[test]
fn tr_id_size() {
assert_eq!(size_of::<TrId>(), BOX_STR, "TrId should be 16 bytes");
}
#[test]
fn eic_code_size() {
assert_eq!(size_of::<EicCode>(), BOX_STR, "EicCode should be 16 bytes");
}
/// `ObisCode` is the one identifier that is not *just* a `Box<str>`: it also
/// caches its parsed value groups so `components()` is infallible and free
/// rather than re-parsing (and re-allocating) on every call.
///
/// The six value groups are octets per IEC 62056-61, so they cost 10 bytes —
/// four `Option<u8>` at 2 bytes plus two bare `u8`. `Box<str>` fills all 16 of
/// its bytes and forces 8-byte alignment, so 16 + 10 rounds up to 32.
///
/// Widening any value group back to `u32` would push this to 40; that is what
/// this guard is here to catch.
#[test]
fn obis_code_size() {
assert_eq!(
size_of::<ObisComponents>(),
10,
"OBIS value groups are octets — this should not grow"
);
assert_eq!(
size_of::<ObisCode>(),
32,
"ObisCode is a Box<str> plus its cached value groups"
);
}
#[test]
fn marktpartner_id_size() {
assert_eq!(
size_of::<MarktpartnerId>(),
BOX_STR,
"MarktpartnerId should be 16 bytes"
);
}
#[test]
fn bilanzkreis_id_size() {
assert_eq!(
size_of::<BilanzkreisId>(),
BOX_STR,
"BilanzkreisId should be 16 bytes"
);
}
#[test]
fn akiv_id_size() {
assert_eq!(size_of::<AkivId>(), BOX_STR, "AkivId should be 16 bytes");
}
#[test]
fn tranchennummer_id_size() {
assert_eq!(
size_of::<TranchennummerId>(),
BOX_STR,
"TranchennummerId should be 16 bytes"
);
}
}
#[cfg(all(target_pointer_width = "64", feature = "versioned", feature = "serde"))]
mod generated_type_sizes {
use rubo4e::v202607::*;
use std::mem::size_of;
/// `BoTyp` is a fieldless repr(u8) enum — 1 byte on its own, but alignment
/// may round up in structs. As a standalone type it is exactly 1 byte.
#[test]
fn bo_typ_size() {
assert_eq!(
size_of::<BoTyp>(),
1,
"BoTyp is a fieldless enum and should be 1 byte"
);
}
/// `Option<BoTyp>` should be 1 byte via niche optimisation.
#[test]
fn option_bo_typ_size() {
// repr(u8) fieldless enums get None-niche from the extra discriminant value.
// In practice this is 1 byte on stable Rust.
assert!(
size_of::<Option<BoTyp>>() <= 2,
"Option<BoTyp> should fit in 2 bytes (niche opt), got {}",
size_of::<Option<BoTyp>>()
);
}
}
/// Every identifier must expose the *same* conversion surface.
///
/// They all share one macro-generated implementation; this asserts it, so a
/// hand-written type cannot ship with a smaller API than its siblings.
mod uniform_trait_surface {
use rubo4e::identifiers::*;
use std::borrow::Borrow;
use std::str::FromStr;
/// Fails to compile if `T` is missing any of the shared identifier traits.
fn assert_full_surface<T>(valid: &str)
where
T: FromStr
+ for<'a> TryFrom<&'a str>
+ TryFrom<String>
+ AsRef<str>
+ Borrow<str>
+ std::ops::Deref<Target = str>
+ std::fmt::Display
+ std::fmt::Debug
+ Clone
+ PartialEq
+ Eq
+ std::hash::Hash,
String: From<T>,
{
let id = T::try_from(valid).ok().expect("fixture must be valid");
// All five string views agree.
assert_eq!(id.as_ref(), valid);
assert_eq!(Borrow::<str>::borrow(&id), valid);
assert_eq!(&*id, valid);
assert_eq!(id.to_string(), valid);
assert_eq!(String::from(id.clone()), valid);
// Display output re-parses to the same value. Routing through
// `to_string()` rather than `as_ref()` is the point of this assertion: it
// pins `Display` and `FromStr` against each other, which borrowing the
// stored string would not exercise.
#[allow(clippy::unnecessary_to_owned)]
let displayed = id.to_string();
assert_eq!(id, T::from_str(&displayed).ok().expect("FromStr"));
assert_eq!(
T::try_from(valid.to_string())
.ok()
.expect("TryFrom<String>"),
id
);
}
#[test]
fn every_identifier_has_the_same_surface() {
assert_full_surface::<MaloId>("41373559241");
assert_full_surface::<MeloId>("DE0000000000000000000000000000001");
assert_full_surface::<MarktpartnerId>("9900357000003");
assert_full_surface::<NeloId>("E0000000019");
assert_full_surface::<NebeId>("F0000000018");
assert_full_surface::<CrId>("A0000000013");
assert_full_surface::<SgId>("B0000000012");
assert_full_surface::<SrId>("C0000000011");
assert_full_surface::<TrId>("D0000000010");
assert_full_surface::<PaketId>("P9000000010");
assert_full_surface::<EicCode>("10YDE-EON------1");
assert_full_surface::<BilanzkreisId>("11XSUEDWESTSTRO8");
assert_full_surface::<BilanzierungsgebietId>("11YN-0000-0001-Q");
assert_full_surface::<AkivId>("550e8400-e29b-41d4-a716-446655440000");
assert_full_surface::<TranchennummerId>("13003");
// `ObisCode` canonicalises, so its fixture must already be canonical.
assert_full_surface::<ObisCode>("1-0:1.8.0*255");
}
}