ic_testkit/
lib.rs

1//! Focused PocketIC test-harness utilities for Internet Computer canisters.
2//!
3//! `ic-testkit` keeps PocketIC itself visible: [`pic`] re-exports the upstream
4//! `PocketIc` and `PocketIcBuilder` types and adds extension traits for typed
5//! Candid calls, generic installation, diagnostics, snapshots, startup errors,
6//! and a small time conversion. It does not provide a simulator wrapper or a
7//! host-wide runtime lock.
8//!
9//! The crate also provides:
10//!
11//! - host-only transactional artifacts, Wasm builds, and freshness helpers in
12//!   [`artifacts`];
13//! - marker parsing, aggregation, comparison, and reports in [`benchmark`];
14//! - canister-side marker emission in [`performance`];
15//! - deterministic test principals through [`Fake`].
16//!
17//! The [`pic`] and [`artifacts`] modules are unavailable when compiling for
18//! `wasm32`; benchmark data types and marker emission remain available to
19//! canister code.
20
21pub mod benchmark;
22
23#[cfg(not(target_arch = "wasm32"))]
24mod timing;
25
26#[cfg(not(target_arch = "wasm32"))]
27pub mod artifacts;
28
29#[cfg(not(target_arch = "wasm32"))]
30pub mod pic;
31
32pub mod performance;
33use candid::Principal;
34
35/// Deterministic principal generator for tests.
36///
37/// Values are derived directly from a numeric seed, making fixtures stable
38/// without embedding textual principal literals.
39pub struct Fake;
40
41impl Fake {
42    /// Deterministically derive a [`Principal`] from `seed`.
43    #[must_use]
44    pub fn principal(seed: u32) -> Principal {
45        let mut buf = [0u8; 29];
46        buf[..4].copy_from_slice(&seed.to_be_bytes());
47
48        Principal::from_slice(&buf)
49    }
50}
51
52#[cfg(test)]
53mod tests {
54    use super::*;
55
56    #[test]
57    fn fake_principal_is_deterministic_and_unique() {
58        let p1 = Fake::principal(7);
59        let p2 = Fake::principal(7);
60        let q = Fake::principal(8);
61
62        assert_eq!(p1, p2, "Fake::principal should be deterministic");
63        assert_ne!(p1, q, "Fake::principal should differ for different seeds");
64
65        let bytes = p1.as_slice();
66        assert_eq!(bytes.len(), 29, "Principal must be 29 bytes");
67    }
68}
ic_testkit/lib.rs

ic_testkit/
lib.rs
