Add code coverage instrumentation to CI pipeline

Additionally, split apart build and test CI jobs. Originally, the tests
required the binary produced by 'cargo build', but now that that's
fixed, and the tests require code coverage instrumentation (forcing a
rebuild anyways), it's better to do the build and test in parallel.

.github/workflows/lint.yml

@@ -54,15 +54,50 @@ jobs:
                 components: clippy
             - name: Setup Rust cache
               uses: swatinem/rust-cache@v2
+            - name: Build
+              run: cargo build --all-targets --all-features
+            - name: Clippy
+              run: cargo clippy --no-deps --all-targets --all-features
+
+    test:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - name: Setup Rust toolchain
+              uses: dtolnay/rust-toolchain@master
+              with:
+                toolchain: stable
+                components: llvm-tools-preview
+            - name: Setup Rust cache
+              uses: swatinem/rust-cache@v2
             - name: Setup nextest
               uses: taiki-e/install-action@v2
               with:
-                tool: cargo-nextest
-            - name: Build
-              run: cargo build --release --all-targets --all-features
-            - name: Clippy
-              run: cargo clippy --no-deps --release --all-targets --all-features
+                tool: cargo-nextest,cargo-llvm-cov
             - name: Test
               run: |
                   git fetch
-                  cargo nextest run --release --all-targets --all-features
+                  cargo llvm-cov --no-report nextest --all-targets --all-features
+                  cargo llvm-cov report --cobertura --output-path coverage.xml
+                  head coverage.xml
+                  RATE="$(grep -o -m 1 -P '(?<=line-rate=").*?(?=")' coverage.xml | head -1)"
+                  echo "RATE=$RATE"
+                  PERCENT="$(echo "$RATE * 100)/1" | bc)"
+                  echo "PERCENT=$PERCENT"
+                  echo "$COVERAGE_PERCENT=$PERCENT" >> $GITHUB_ENV
+            - name: Update coverage badge
+              uses: schneegans/[email protected]
+              if: github.ref_name == github.event.repository.default_branch
+              with:
+                # https://github.com/Notgnoshi/herostratus/settings/secrets/actions
+                # https://github.com/settings/personal-access-tokens
+                # https://gist.github.com/Notgnoshi/b20aa388c90ca92aba6aa37ec55a7f12
+                # https://github.com/marketplace/actions/dynamic-badges
+                auth: ${{ secrets.HEROSTRATUS_COVERAGE_GIST_TOKEN }}
+                gistID: b20aa388c90ca92aba6aa37ec55a7f12
+                filename: herostratus-coverage.json
+                label: Code Coverage
+                message: "${{ env.COVERAGE_PERCENT }}%"
+                valColorRange: ${{ env.COVERAGE_PERCENT }}
+                minColorRange: 60
+                maxColorRange: 95

.github/workflows/release.yml

@@ -14,6 +14,8 @@ jobs:
         steps:
             - uses: actions/checkout@v4
               with:
+                # https://github.com/Notgnoshi/herostratus/settings/secrets/actions
+                # https://github.com/settings/personal-access-tokens
                 token: ${{ secrets.HEROSTRATUS_RELEASE_TOKEN }}
             - name: Validate SemVer Version
               shell: bash  # Explicitly setting the shell sets errexit and pipefail flags

README.md

@@ -2,6 +2,7 @@
 
 ![lint workflow](https://github.com/Notgnoshi/herostratus/actions/workflows/lint.yml/badge.svg?event=push)
 ![release workflow](https://github.com/Notgnoshi/herostratus/actions/workflows/release.yml/badge.svg?event=push)
+![code coverage](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/Notgnoshi/b20aa388c90ca92aba6aa37ec55a7f12/raw/herostratus-coverage.json)
 
 **Herostratus** _n._ **1.** An [ancient Greek](https://en.wikipedia.org/wiki/Herostratus) known for
 seeking fame through crime and destruction. **2.** A Git repository achievements engine.