Mutation Testing: Create coverage in parallel

.github/workflows/tests.yml

@@ -229,12 +229,15 @@ jobs:
           php-version: "${{ matrix.php-version }}"
           extensions: ds,mbstring
 
-      - name: "Install dependencies"
-        run: "composer install --no-interaction --no-progress"
+      - uses: "ramsey/composer-install@v3"
+
+      - uses: "ramsey/composer-install@v3"
+        with:
+          working-directory: "tests/"
 
-      - name: "Install build-infection dependencies"
-        working-directory: "build-infection"
-        run: "composer install --no-interaction --no-progress"
+      - uses: "ramsey/composer-install@v3"
+        with:
+          working-directory: "build-infection/"
 
       - name: "Configure infection"
         run: |
@@ -257,12 +260,21 @@ jobs:
           restore-keys: |
             result-cache-v1-${{ matrix.php-version }}-
 
+      # see https://infection.github.io/guide/command-line-options.html#coverage
+      - name: "Create coverage in parallel"
+        run: |
+          php -d pcov.enabled=1 tests/vendor/bin/paratest \
+            --passthru-php="'-d' 'pcov.enabled=1'" \
+            --coverage-xml=tmp/coverage/coverage-xml --log-junit=tmp/coverage/junit.xml
+
       - name: "Run infection"
         run: |
           git fetch --depth=1 origin ${{ steps.default-branch.outputs.name }}
           infection \
             --git-diff-base=origin/${{ steps.default-branch.outputs.name }} \
             --git-diff-lines \
+            --coverage=tmp/coverage \
+            --skip-initial-tests \
             --ignore-msi-with-no-mutations \
             --min-msi=100 \
             --min-covered-msi=100 \

phpunit.xml

@@ -15,5 +15,10 @@
       <group>levels</group>
     </exclude>
   </groups>
+  <source ignoreIndirectDeprecations="true" restrictNotices="true" restrictWarnings="true">
+    <include>
+      <directory>src</directory>
+    </include>
+  </source>
   <logging/>
 </phpunit>