Crate ferridriver_expect 

Value matchers (Jest-compatible) and asymmetric matchers for ferridriver’s expect() API. Shared between the test runner (ferridriver-test) and the QuickJS scripting layer (ferridriver-script) so both surfaces dispatch through the same Rust core (per the Rust-is-the-source-of-truth rule).

Web-first matchers (locator/page/apiResponse) still live in ferridriver-test::expect because they need the test runner’s polling + screenshot context. This crate is intentionally tiny: regex, serde, serde_json deps only.

Re-exports

pub use asymmetric::ASYM_TAG_KEY;

pub use asymmetric::Asymmetric;

pub use asymmetric::TypeTag;

pub use asymmetric::deep_equal;

pub use asymmetric::match_object;

pub use builder::Expect;

pub use builder::ExpectPoll;

pub use builder::HaveCssOptions;

pub use builder::InViewportOptions;

pub use builder::ToPassOptions;

pub use builder::expect;

pub use builder::expect_configured;

pub use builder::expect_poll;

pub use builder::to_pass;

pub use builder::to_pass_with_options;

pub use diff::json_diff;

pub use diff::pretty_json;

pub use diff::unified_diff;

pub use poll::DEFAULT_EXPECT_TIMEOUT;

pub use poll::ExpectContext;

pub use poll::MatchError;

pub use poll::POLL_INTERVALS;

pub use poll::poll_until;

pub use throw::ExpectFn;

pub use throw::ThrowMatcher;

pub use throw::ThrownError;

pub use throw::expect_fn;

pub use value::ExpectValue;

pub use value::StringOrRegex;

pub use value::expect_value;

Modules

api_response

expect(apiResponse).toBeOK() — synchronous status check on a captured ferridriver::http_client::HttpResponse.

asymmetric

Asymmetric matchers (expect.any, expect.objectContaining, …). Wire-encoded as a tagged JSON object so the script layer can produce them in JS and have them round-trip through serde_json::Value.

builder

Expect<T> builder shared by every consumer (test runner, QuickJS binding, plain Rust callers). Targets are subjects of web-first matchers — &Locator, &Arc<Page>, &HttpResponse. Value matchers live on crate::ExpectValue instead.

diff

Unified-diff rendering for assertion failures.

locator

Locator web-first matchers — single source of truth shared by the test runner (ferridriver-test) and the QuickJS binding (ferridriver-script). Screenshot / aria-snapshot / value-snapshot matchers stay in ferridriver-test because they pull in image and aria-YAML infrastructure that does not belong in this lightweight crate.

page

Page web-first matchers — url + title only. Snapshot/screenshot/ aria matchers live in ferridriver-test because they need the test-runner’s snapshot directory + image pipeline.

poll

Generic async polling primitives shared by the test runner’s Expect<T> and the script-layer ExpectJs binding.

throw

Synchronous toThrow matcher (Jest’s expect(fn).toThrow(...)).

value

Synchronous value matchers (Jest-style).

Structs

AssertionFailure

Failure produced by a synchronous value matcher.

CallerLocation

Source location captured at the matcher call site. 'static strings come straight from std::panic::Location — no allocations on the happy path.