Function field

pub fn field<K>(name: K) -> ExpectedField
where
    String: From<K>,

Construct a new ExpectedField.

For details on how to set the value of the expected field and how to expect multiple fields, see the field module and the ExpectedField and ExpectedFields structs. span, see the span module and the ExpectedSpan and NewSpan structs.

Examples

use tracing_mock::{collector, expect};

let event = expect::event()
    .with_fields(expect::field("field.name").with_value(&"field_value"));

let (collector, handle) = collector::mock()
    .event(event)
    .run_with_handle();

tracing::collect::with_default(collector, || {
    tracing::info!(field.name = "field_value");
});

handle.assert_finished();

A different field value will cause the test to fail:

use tracing_mock::{collector, expect};

let event = expect::event()
    .with_fields(expect::field("field.name").with_value(&"field_value"));

let (collector, handle) = collector::mock()
    .event(event)
    .run_with_handle();

tracing::collect::with_default(collector, || {
    tracing::info!(field.name = "different_field_value");
});

handle.assert_finished();