Migrate to cargo-llvm-cov as coverage provider

.github/workflows/ci.yml

@@ -123,9 +123,10 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - uses: dtolnay/rust-toolchain@stable
-    - run: cargo install --force cargo-tarpaulin
-    - run: cargo tarpaulin --all-features --workspace --engine llvm -o Xml
+    - uses: taiki-e/install-action@cargo-llvm-cov
+    - run: cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info
     - uses: codecov/codecov-action@v3
       with:
         token: ${{secrets.CODECOV_TOKEN}}
+        files: lcov.info
         fail_ci_if_error: true

CONTRIBUTING.md

@@ -2,18 +2,18 @@
 
 * All code submitted to RingChannel via pull requests is
 assumed to be [licensed under the MIT][LICENSE].
-* Every code change must be covered by unit tests, use [tarpaulin] to generate the code coverage report:
-  + `cargo +nightly tarpaulin -v --all-features`
+* Every code change must be covered by unit tests, use [cargo-llvm-cov] to generate the code coverage report:
+  + `cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info`
 * Besides `cargo test`, make sure [Clippy] and [rustfmt] checks also pass before submitting a pull request:
   + `cargo clippy --all-targets -- -D warnings`
   + `cargo fmt --all -- --check`
 * Follow [rustsec.org] advisories when introducing new dependencies, use [cargo-audit] to verify:
   + `cargo audit -D`
 
-[LICENSE]:      https://github.com/brunocodutra/ring-channel/blob/master/LICENSE
-[rustsec.org]:  https://rustsec.org/advisories/
+[LICENSE]:        https://github.com/brunocodutra/ring-channel/blob/master/LICENSE
+[rustsec.org]:    https://rustsec.org/advisories/
 
-[Clippy]:       https://github.com/rust-lang/rust-clippy#usage
-[rustfmt]:      https://github.com/rust-lang/rustfmt#quick-start
-[tarpaulin]:    https://github.com/xd009642/tarpaulin#usage
-[cargo-audit]:  https://github.com/RustSec/cargo-audit#installation
+[Clippy]:         https://github.com/rust-lang/rust-clippy#usage
+[rustfmt]:        https://github.com/rust-lang/rustfmt#quick-start
+[cargo-llvm-cov]: https://github.com/taiki-e/cargo-llvm-cov#usage
+[cargo-audit]:    https://github.com/RustSec/cargo-audit#installation

benches/throughput.rs

@@ -1,5 +1,3 @@
-#![cfg(not(tarpaulin))]
-
 use criterion::measurement::{Measurement, WallTime};
 use criterion::{criterion_group, criterion_main, BenchmarkGroup, Criterion, Throughput};
 use futures::future::{try_join, try_join_all};

fuzz/fuzzer.rs

@@ -1,4 +1,3 @@
-#![cfg(not(tarpaulin))]
 #![no_main]
 
 use futures::{future::*, prelude::*, stream::*};