tracing: move tracing instrumentation tests into tokio tests

In #6112, tests for the tracing instrumentation were introduced. They
had to live in their own test crate under `tokio/tests` because the
`tracing-mock` crate that the tests use had not yet been published to
crates.io.

Now `tracing-mock` has been published to crates.io and so the separate
test crate and separate job to run it are no longer necessary. The
tracing instrumentation tests can be placed in with the other
integration tests in the `tokio` crate.

The tests themselves have also been updated to match the changes in the
`tracing-mock` API since the version which was being used.

.github/workflows/ci.yml

@@ -47,7 +47,6 @@ jobs:
       - test-workspace-all-features
       - test-integration-tests-per-feature
       - test-parking_lot
-      - test-tracing-instrumentation
       - valgrind
       - test-unstable
       - miri
@@ -246,34 +245,6 @@ jobs:
       - name: Check tests with all features enabled
         run: cargo check --workspace --all-features --tests
 
-  test-tracing-instrumentation:
-    # These tests use the as-yet unpublished `tracing-mock` crate to test the
-    # tracing instrumentation present in Tokio. As such they are placed in
-    # their own test crate outside of the workspace.
-    needs: basics
-    name: test tokio instrumentation
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Install Rust ${{ env.rust_stable }}
-        uses: dtolnay/rust-toolchain@stable
-        with:
-          toolchain: ${{ env.rust_stable }}
-      - name: Install cargo-nextest
-        uses: taiki-e/install-action@v2
-        with:
-          tool: cargo-nextest
-
-      - uses: Swatinem/rust-cache@v2
-
-      - name: test tracing-instrumentation
-        run: |
-          set -euxo pipefail
-          cargo nextest run
-        working-directory: tokio/tests/tracing-instrumentation
-        env:
-          RUSTFLAGS: --cfg tokio_unstable -Dwarnings
-
   valgrind:
     name: valgrind
     needs: basics

tokio/Cargo.toml

@@ -151,6 +151,9 @@ mio-aio = { version = "0.9.0", features = ["tokio"] }
 [target.'cfg(loom)'.dev-dependencies]
 loom = { version = "0.7", features = ["futures", "checkpoint"] }
 
+[target.'cfg(tokio_unstable)'.dev-dependencies]
+tracing-mock = "= 0.1.0-beta.1"
+
 [package.metadata.docs.rs]
 all-features = true
 # enable unstable features in the documentation

tokio/tests/tracing-instrumentation/tests/sync.rs → tokio/tests/tracing_sync.rs

@@ -2,6 +2,9 @@
 //!
 //! These tests ensure that the instrumentation for tokio
 //! synchronization primitives is correct.
+#![allow(unknown_lints, unexpected_cfgs)]
+#![warn(rust_2018_idioms)]
+#![cfg(all(tokio_unstable, feature = "tracing"))]
 
 use tokio::sync;
 use tracing_mock::{expect, subscriber};
@@ -14,19 +17,23 @@ async fn test_barrier_creates_span() {
 
     let size_event = expect::event()
         .with_target("runtime::resource::state_update")
-        .with_fields(expect::field("size").with_value(&1u64));
+        .with_fields(expect::field("size").with_value(&1_u64));
 
     let arrived_event = expect::event()
         .with_target("runtime::resource::state_update")
-        .with_fields(expect::field("arrived").with_value(&0));
+        .with_fields(expect::field("arrived").with_value(&0_i64));
 
     let (subscriber, handle) = subscriber::mock()
-        .new_span(barrier_span.clone().with_explicit_parent(None))
-        .enter(barrier_span.clone())
+        .new_span(
+            barrier_span
+                .clone()
+                .with_ancestry(expect::is_explicit_root()),
+        )
+        .enter(&barrier_span)
         .event(size_event)
         .event(arrived_event)
-        .exit(barrier_span.clone())
-        .drop_span(barrier_span)
+        .exit(&barrier_span)
+        .drop_span(&barrier_span)
         .run_with_handle();
 
     {
@@ -57,16 +64,20 @@ async fn test_mutex_creates_span() {
         .with_fields(expect::field("permits.op").with_value(&"override"));
 
     let (subscriber, handle) = subscriber::mock()
-        .new_span(mutex_span.clone().with_explicit_parent(None))
-        .enter(mutex_span.clone())
+        .new_span(mutex_span.clone().with_ancestry(expect::is_explicit_root()))
+        .enter(&mutex_span)
         .event(locked_event)
-        .new_span(batch_semaphore_span.clone().with_explicit_parent(None))
-        .enter(batch_semaphore_span.clone())
+        .new_span(
+            batch_semaphore_span
+                .clone()
+                .with_ancestry(expect::is_explicit_root()),
+        )
+        .enter(&batch_semaphore_span)
         .event(batch_semaphore_permits_event)
-        .exit(batch_semaphore_span.clone())
-        .exit(mutex_span.clone())
-        .drop_span(mutex_span)
-        .drop_span(batch_semaphore_span)
+        .exit(&batch_semaphore_span)
+        .exit(&mutex_span)
+        .drop_span(&mutex_span)
+        .drop_span(&batch_semaphore_span)
         .run_with_handle();
 
     {
@@ -79,7 +90,9 @@ async fn test_mutex_creates_span() {
 
 #[tokio::test]
 async fn test_oneshot_creates_span() {
+    let oneshot_span_id = expect::id();
     let oneshot_span = expect::span()
+        .with_id(oneshot_span_id.clone())
         .named("runtime.resource")
         .with_target("tokio::sync::oneshot");
 
@@ -113,7 +126,9 @@ async fn test_oneshot_creates_span() {
         .with_fields(expect::field("value_received").with_value(&false))
         .with_fields(expect::field("value_received.op").with_value(&"override"));
 
+    let async_op_span_id = expect::id();
     let async_op_span = expect::span()
+        .with_id(async_op_span_id.clone())
         .named("runtime.resource.async_op")
         .with_target("tokio::sync::oneshot");
 
@@ -122,34 +137,46 @@ async fn test_oneshot_creates_span() {
         .with_target("tokio::sync::oneshot");
 
     let (subscriber, handle) = subscriber::mock()
-        .new_span(oneshot_span.clone().with_explicit_parent(None))
-        .enter(oneshot_span.clone())
+        .new_span(
+            oneshot_span
+                .clone()
+                .with_ancestry(expect::is_explicit_root()),
+        )
+        .enter(&oneshot_span)
         .event(initial_tx_dropped_event)
-        .exit(oneshot_span.clone())
-        .enter(oneshot_span.clone())
+        .exit(&oneshot_span)
+        .enter(&oneshot_span)
         .event(initial_rx_dropped_event)
-        .exit(oneshot_span.clone())
-        .enter(oneshot_span.clone())
+        .exit(&oneshot_span)
+        .enter(&oneshot_span)
         .event(value_sent_event)
-        .exit(oneshot_span.clone())
-        .enter(oneshot_span.clone())
+        .exit(&oneshot_span)
+        .enter(&oneshot_span)
         .event(value_received_event)
-        .exit(oneshot_span.clone())
-        .enter(oneshot_span.clone())
-        .new_span(async_op_span.clone())
-        .exit(oneshot_span.clone())
-        .enter(async_op_span.clone())
-        .new_span(async_op_poll_span.clone())
-        .exit(async_op_span.clone())
-        .enter(oneshot_span.clone())
+        .exit(&oneshot_span)
+        .enter(&oneshot_span)
+        .new_span(
+            async_op_span
+                .clone()
+                .with_ancestry(expect::has_contextual_parent(&oneshot_span_id)),
+        )
+        .exit(&oneshot_span)
+        .enter(&async_op_span)
+        .new_span(
+            async_op_poll_span
+                .clone()
+                .with_ancestry(expect::has_contextual_parent(&async_op_span_id)),
+        )
+        .exit(&async_op_span)
+        .enter(&oneshot_span)
         .event(final_tx_dropped_event)
-        .exit(oneshot_span.clone())
-        .enter(oneshot_span.clone())
+        .exit(&oneshot_span)
+        .enter(&oneshot_span)
         .event(final_rx_dropped_event)
-        .exit(oneshot_span.clone())
+        .exit(&oneshot_span)
         .drop_span(oneshot_span)
         .drop_span(async_op_span)
-        .drop_span(async_op_poll_span)
+        .drop_span(&async_op_poll_span)
         .run_with_handle();
 
     {
@@ -176,7 +203,7 @@ async fn test_rwlock_creates_span() {
 
     let current_readers_event = expect::event()
         .with_target("runtime::resource::state_update")
-        .with_fields(expect::field("current_readers").with_value(&0));
+        .with_fields(expect::field("current_readers").with_value(&0_i64));
 
     let batch_semaphore_span = expect::span()
         .named("runtime.resource")
@@ -188,7 +215,11 @@ async fn test_rwlock_creates_span() {
         .with_fields(expect::field("permits.op").with_value(&"override"));
 
     let (subscriber, handle) = subscriber::mock()
-        .new_span(rwlock_span.clone().with_explicit_parent(None))
+        .new_span(
+            rwlock_span
+                .clone()
+                .with_ancestry(expect::is_explicit_root()),
+        )
         .enter(rwlock_span.clone())
         .event(max_readers_event)
         .event(write_locked_event)
@@ -228,7 +259,11 @@ async fn test_semaphore_creates_span() {
         .with_fields(expect::field("permits.op").with_value(&"override"));
 
     let (subscriber, handle) = subscriber::mock()
-        .new_span(semaphore_span.clone().with_explicit_parent(None))
+        .new_span(
+            semaphore_span
+                .clone()
+                .with_ancestry(expect::is_explicit_root()),
+        )
         .enter(semaphore_span.clone())
         .new_span(batch_semaphore_span.clone())
         .enter(batch_semaphore_span.clone())
@@ -246,3 +281,9 @@ async fn test_semaphore_creates_span() {
 
     handle.assert_finished();
 }
+
+#[test]
+fn this_test_must_fail() {
+    let value = false;
+    assert!(value, "I must fail");
+}

tokio/tests/tracing-instrumentation/tests/task.rs → tokio/tests/tracing_task.rs

@@ -2,6 +2,9 @@
 //!
 //! These tests ensure that the instrumentation for task spawning and task
 //! lifecycles is correct.
+#![allow(unknown_lints, unexpected_cfgs)]
+#![warn(rust_2018_idioms)]
+#![cfg(all(tokio_unstable, feature = "tracing"))]
 
 use std::{mem, time::Duration};
 
@@ -15,12 +18,12 @@ async fn task_spawn_creates_span() {
         .with_target("tokio::task");
 
     let (subscriber, handle) = subscriber::mock()
-        .new_span(task_span.clone())
-        .enter(task_span.clone())
-        .exit(task_span.clone())
+        .new_span(&task_span)
+        .enter(&task_span)
+        .exit(&task_span)
         // The task span is entered once more when it gets dropped
-        .enter(task_span.clone())
-        .exit(task_span.clone())
+        .enter(&task_span)
+        .exit(&task_span)
         .drop_span(task_span)
         .run_with_handle();
 
@@ -39,7 +42,7 @@ async fn task_spawn_loc_file_recorded() {
     let task_span = expect::span()
         .named("runtime.spawn")
         .with_target("tokio::task")
-        .with_field(expect::field("loc.file").with_value(&file!()));
+        .with_fields(expect::field("loc.file").with_value(&file!()));
 
     let (subscriber, handle) = subscriber::mock().new_span(task_span).run_with_handle();
 
@@ -78,7 +81,7 @@ async fn task_builder_loc_file_recorded() {
     let task_span = expect::span()
         .named("runtime.spawn")
         .with_target("tokio::task")
-        .with_field(expect::field("loc.file").with_value(&file!()));
+        .with_fields(expect::field("loc.file").with_value(&file!()));
 
     let (subscriber, handle) = subscriber::mock().new_span(task_span).run_with_handle();
 
@@ -105,7 +108,7 @@ async fn task_spawn_sizes_recorded() {
         .with_target("tokio::task")
         // TODO(hds): check that original_size.bytes is NOT recorded when this can be done in
         // tracing-mock without listing every other field.
-        .with_field(expect::field("size.bytes").with_value(&size));
+        .with_fields(expect::field("size.bytes").with_value(&size));
 
     let (subscriber, handle) = subscriber::mock().new_span(task_span).run_with_handle();
 
@@ -149,7 +152,7 @@ async fn task_big_spawn_sizes_recorded() {
     let task_span = expect::span()
         .named("runtime.spawn")
         .with_target("tokio::task")
-        .with_field(
+        .with_fields(
             expect::field("size.bytes")
                 .with_value(&boxed_size)
                 .and(expect::field("original_size.bytes").with_value(&size)),
@@ -178,7 +181,7 @@ fn expect_task_named(name: &str) -> NewSpan {
     expect::span()
         .named("runtime.spawn")
         .with_target("tokio::task")
-        .with_field(
+        .with_fields(
             expect::field("task.name").with_value(&tracing::field::debug(format_args!("{}", name))),
         )
 }