Add a code coverage check to the CI pipeline (#84)

Closes #83

Reviewed-on: #84

.gitea/images/Dockerfile

@@ -1,6 +1,12 @@
 FROM docker.io/library/rust:1.75
 
-RUN rustup component add clippy rustfmt
+RUN rustup component add \
+  clippy \
+  llvm-tools-preview \
+  rustfmt
+
+RUN cargo install \
+  grcov
 
 RUN apt-get update && apt-get install -y \
   beets \

.gitea/scripts/coverage.py

@@ -0,0 +1,23 @@
+import argparse
+import json
+
+
+def main(coverage_file, fail_under):
+    with open(coverage_file, encoding="utf-8") as f:
+        coverage_json = json.load(f)
+    coverage = float(coverage_json["message"][:-1])
+    return coverage >= fail_under
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Check coverage output by grcov")
+
+    parser.add_argument("--coverage-file", type=str, required=True,
+                        help="Path to the coverage.json file output by grcov")
+    parser.add_argument("--fail-under", type=float, default=100.,
+                        help="Threshold under which coverage is insufficient")
+
+    args = parser.parse_args()
+
+    if not main(args.coverage_file, args.fail_under):
+        exit(2)

.gitea/workflows/gitea-ci.yaml

@@ -8,21 +8,40 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
-  BEETSDIR: ./
+  CARGO_TERM_VERBOSE: true
 
 jobs:
   build_and_test:
     name: Build and Test
     container: docker.io/drrobot/musichoard-ci:rust-1.75
+    env:
+      BEETSDIR: ./
+      LLVM_PROFILE_FILE: target/debug/profraw/musichoard-%p-%m.profraw
+      RUSTFLAGS: -C instrument-coverage
     steps:
       - uses: actions/checkout@v3
-      - run: cargo build --verbose --all-features --all-targets
-      - run: cargo test --verbose --all-features --all-targets --no-fail-fast
+      - run: cargo build --all-features --all-targets
+      - run: cargo test --all-features --all-targets --no-fail-fast
+      - run: >-
+          grcov target/debug/profraw
+          --binary-path target/debug/
+          --output-types html
+          --source-dir .
+          --ignore-not-existing
+          --ignore "tests/*"
+          --ignore "src/main.rs"
+          --excl-start "GRCOV_EXCL_START|mod tests \{"
+          --excl-stop "GRCOV_EXCL_STOP"
+          --output-path ./target/debug/coverage/
+      - run: >-
+          python3 .gitea/scripts/coverage.py
+          --coverage-file ./target/debug/coverage/coverage.json
+          --fail-under 100.00
 
   lint:
     name: Lint
     container: docker.io/drrobot/musichoard-ci:rust-1.75
     steps:
       - uses: actions/checkout@v3
-      - run: cargo clippy --verbose --all-features --all-targets -- -D warnings
-      - run: cargo fmt --verbose -- --check
+      - run: cargo clippy --all-features --all-targets -- -D warnings
+      - run: cargo fmt -- --check

README.md

@@ -23,6 +23,7 @@ env CARGO_TARGET_DIR=codecov \
 env RUSTFLAGS="-C instrument-coverage" \
     LLVM_PROFILE_FILE="codecov/debug/profraw/musichoard-%p-%m.profraw" \
     CARGO_TARGET_DIR=codecov \
+    BEETSDIR=./ \
     cargo test --all-features --all-targets
 grcov codecov/debug/profraw \
       --binary-path ./codecov/debug/ \
@@ -31,7 +32,7 @@ grcov codecov/debug/profraw \
       --ignore-not-existing \
       --ignore "tests/*" \
       --ignore "src/main.rs" \
-      --excl-start "mod tests \{|GRCOV_EXCL_START" \
+      --excl-start "GRCOV_EXCL_START|mod tests \{" \
       --excl-stop "GRCOV_EXCL_STOP" \
       --output-path ./codecov/debug/coverage/
 xdg-open codecov/debug/coverage/index.html