Macro tracing_capture_event_fields

macro_rules! tracing_capture_event_fields {
    ( $code_under_test:block ) => { ... };
}

This macro runs the given code block, collects any tracing Events emitted, and returns the Field/Value pairs carried by each event.

This utility macro is useful for callers only caring about the custom Field/Value data, and not necessarily the complete Event object.

Use it with

use tracing;
use tracing_assert_core::FieldValueMap;
use tracing_assert_macros::tracing_capture_event_fields;

fn foo() {
    tracing::trace!("my event data!");
}

let events: Vec<FieldValueMap> = tracing_capture_event_fields!({foo()});