windows-threadpool-sys 0.1.4

Memory-safe access to the Windows thread pool APIs.
Documentation 
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// Copyright (c) Mike Grier
//! Tests for the trace facility.
//!
//! These run in both builds. Without the `trace` feature every entry point is
//! a no-op, and asserting *that* is the point: a call site left in shipping
//! code must cost nothing and must not misreport.

use super::{dump, enabled, wants};

#[test]
fn a_build_without_the_feature_reports_nothing_and_says_so() {
    if cfg!(feature = "trace") {
        return;
    }
    assert!(!enabled(), "tracing cannot be on without the feature");
    assert!(
        !wants("anything"),
        "no target is traced without the feature"
    );
    assert!(
        dump().contains("without the `trace` feature"),
        "a dump must say why it is empty rather than look like a clean run -- an empty trace and \
         a trace that was never compiled in are very different findings"
    );
}

#[test]
fn recording_is_inert_without_the_feature() {
    if cfg!(feature = "trace") {
        return;
    }
    // The call must compile and do nothing. If this ever starts recording,
    // the shipping build has acquired a lock and an allocation on a path that
    // is meant to carry neither.
    crate::trace_record!("test", "inert", 1, 2);
    assert!(!dump().contains("inert"));
}

#[test]
fn the_filter_narrows_to_the_targets_named() {
    if !cfg!(feature = "trace") {
        return;
    }
    // `wants` is driven by the process environment, which is read once and
    // cached, so this asserts the relationship that holds whatever the
    // variable is set to rather than mutating it: a target that is wanted
    // implies tracing is on at all.
    for target in ["wait", "delivery", "something-else"] {
        if wants(target) {
            assert!(
                enabled(),
                "a wanted target implies the trace is enabled: {target}"
            );
        }
    }
}