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add optional coverage on integration test

trinity-1686a requested to merge trinity-1686a/arti:coverage-integration2 into main

second attempt at #227 (closed)

to use, simply run setup/teardown with COVERAGE=1. This require grcov to make raw data into readable report. It can be installed with cargo install grcov.

Result of a run with what the CI does currently (a single curl) is temporarily available here.

Alternatively, we could have a source-able script containing the following:

COVERAGE_BASEDIR=$(git rev-parse --show-toplevel)
export RUSTFLAGS="-Z instrument-coverage"
export LLVM_PROFILE_FILE=$COVERAGE_BASEDIR/coverage_meta/%p-%m.profraw
export RUSTUP_TOOLCHAIN=nightly

function generate_report() {
	grcov "$COVERAGE_BASEDIR/coverage_meta" --binary-path "$COVERAGE_BASEDIR/target/debug/" \
			-s "$COVERAGE_BASEDIR/crates/" -t html --branch --ignore-not-existing -o "$result"

Source this and anything you compile and run (tests, normat run/integration tests, but apparently not fuzzing with cargo-fuzz) generate coverage data

Edited by trinity-1686a

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