Crate tracing_assertions

An assertions framework for tracing.

Simpler and faster than the alternatives.

use tracing_subscriber::layer::SubscriberExt;
// Initialize a subscriber with the layer.
let asserter = tracing_assertions::Layer::default();
let registry = tracing_subscriber::Registry::default();
let subscriber = registry.with(asserter.clone());
let guard = tracing::subscriber::set_default(subscriber);
let one = asserter.matches("one");
let two = asserter.matches("two");
let and = &one & &two;
tracing::info!("one");
one.assert();
tracing::info!("two");
two.assert();
and.assert();

drop(guard); // Drop `subscriber` as the current subscriber.

Failing

When failing e.g.

let one = asserter.matches("one");
let two = asserter.matches("two");
let and = &one & &two;
tracing::info!("one");
and.assert();

Outputs:

thread 'main' panicked at src/lib.rs:14:5:
("one" && "two")

Operations

Logical operations clone the underlying assertions.

let one = asserter.matches("one");
let two = asserter.matches("two");
let and = &one & &two;
tracing::info!("one");
tracing::info!("two");
one.assert().reset();
and.assert().reset();
two.assert();
(!one).assert();
(!and).assert();

Calling Assertion::reset on one does not affect the value of and and calling Assertion::reset on and does not affect the value of two.

Similar crates

• test-log: A replacement of the #[test] attribute that initializes logging and/or tracing infrastructure before running tests.
• tracing_test: Helper functions and macros that allow for easier testing of crates that use tracing.
• tracing-fluent-assertions: An fluent assertions framework for tracing.

Structs

Assertion

An assertion.

Layer

The assertion layer.