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docs: add notes on collecting coverage data from in-tree tests

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Signed-off-by: Wei Liu <liuwe@microsoft.com>
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Wei Liu 2023-10-19 23:43:10 +00:00 committed by Liu Wei
parent 8ba5682e3b
commit 6113483363
1 changed files with 26 additions and 0 deletions
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docs/coverage.md
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@ -53,3 +53,29 @@ grcov . --binary-path ./target/x86_64-unknown-linux-gnu/release -s . -t html --b
You can then open the `index.html` file under coverage-html-output to see the
results.
## Notes on running the in-tree integration tests and unit tests
Please set RUSTFLAGS the same way while invoking `dev_cli.sh`. The script will
pass RUSTFLAGS to the container.
Since the `profraw` files are generated from within the container, the file
paths embedded in the data files are going to be different. It is easier to do
the data processing from within the container if you don't want to fight the
tool chain.
```shell
# Get a shell
./scripts/dev_cli.sh shell
# Install llvm-tools-preview for llvm-profdata
rustup component add llvm-tools-preview
# Merge data files by using the following command
find . -name '*.profraw' -exec `rustc --print sysroot`/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-profdata merge -sparse {} -o coverage.profdata \;
# As of writing, the container has Rust 1.67.1. It is too old for grcov.
rustup install stable
cargo +stable install grcov
# Run grcov as usual
grcov . --binary-path ./target/x86_64-unknown-linux-gnu/release -s . -t html --branch --ignore-not-existing -o coverage-html-output/
```