diff --git a/.ahoy.yml b/.ahoy.yml
index 9a9774d..5ba7975 100644
--- a/.ahoy.yml
+++ b/.ahoy.yml
@@ -61,28 +61,28 @@ commands:
     usage: Run tests.
     cmd: |
       pushd "build" >/dev/null || exit 1
-      vendor/bin/phpunit
+      php -d pcov.directory=.. vendor/bin/phpunit
       popd >/dev/null || exit 1
 
   test-unit:
     usage: Run unit tests.
     cmd: |
       pushd "build" >/dev/null || exit 1
-      vendor/bin/phpunit --testsuite unit "$@"
+      php -d pcov.directory=.. vendor/bin/phpunit --testsuite unit "$@"
       popd >/dev/null || exit 1
 
   test-kernel:
     usage: Run kernel tests.
     cmd: |
       pushd "build" >/dev/null || exit 1
-      vendor/bin/phpunit --testsuite kernel "$@"
+      php -d pcov.directory=.. vendor/bin/phpunit --testsuite kernel "$@"
       popd >/dev/null || exit 1
 
   test-functional:
     usage: Run functional tests.
     cmd: |
       pushd "build" >/dev/null || exit 1
-      vendor/bin/phpunit --testsuite functional "$@"
+      php -d pcov.directory=.. vendor/bin/phpunit --testsuite functional "$@"
       popd >/dev/null || exit 1
 
   reset:
diff --git a/.circleci/config.yml b/.circleci/config.yml
index d349069..3f80318 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -84,7 +84,7 @@ job-test: &job-test
 
     - run:
         name: Run tests
-        command: vendor/bin/phpunit || [ "${CI_TEST_IGNORE_FAILURE:-0}" -eq 1 ]
+        command: php -d pcov.directory=.. vendor/bin/phpunit || [ "${CI_TEST_IGNORE_FAILURE:-0}" -eq 1 ]
         working_directory: build
         environment:
           BROWSERTEST_OUTPUT_DIRECTORY: /tmp
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 497254b..138fa96 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -111,7 +111,6 @@ jobs:
           php-version: ${{ matrix.php-version }}
           extensions: gd, sqlite, pdo_sqlite
           coverage: pcov
-          ini-values: pcov.directory=.
 
       # Disable Symfony deprecations helper for PHP 8.4+ until minor
       # versions of Drupal 10 and 11 fully support PHP 8.4.
@@ -156,7 +155,7 @@ jobs:
 
       - name: Run tests
         working-directory: build
-        run: vendor/bin/phpunit || [ "${CI_TEST_IGNORE_FAILURE:-0}" -eq 1 ]
+        run: php -d pcov.directory=.. vendor/bin/phpunit || [ "${CI_TEST_IGNORE_FAILURE:-0}" -eq 1 ]
         env:
           BROWSERTEST_OUTPUT_DIRECTORY: /tmp
 
diff --git a/.scaffold/tests/bats/_assert_init.bash b/.scaffold/tests/bats/_assert_init.bash
index c2cb11a..efa3a6f 100644
--- a/.scaffold/tests/bats/_assert_init.bash
+++ b/.scaffold/tests/bats/_assert_init.bash
@@ -185,3 +185,16 @@ assert_workflow_run() {
 
   popd >/dev/null || exit 1
 }
+
+assert_test_coverage() {
+  local dir="${1:-$(pwd)}"
+  pushd "${dir}" >/dev/null || exit 1
+
+  assert_file_exists ".logs/coverage/phpunit/cobertura.xml"
+  assert_file_not_contains ".logs/coverage/phpunit/cobertura.xml" 'coverage line-rate="0"'
+
+  assert_file_exists ".logs/coverage/phpunit/.coverage-html/index.html"
+  assert_file_contains ".logs/coverage/phpunit/.coverage-html/index.html" "33.33% covered"
+
+  popd >/dev/null || exit 1
+}
diff --git a/.scaffold/tests/bats/ahoy.bats b/.scaffold/tests/bats/ahoy.bats
index 1c7015a..b47b1e1 100644
--- a/.scaffold/tests/bats/ahoy.bats
+++ b/.scaffold/tests/bats/ahoy.bats
@@ -121,6 +121,8 @@ export BATS_FIXTURE_EXPORT_CODEBASE_ENABLED=1
   run ahoy test-unit
   assert_success
 
+  assert_test_coverage
+
   sed -i -e "s/assertEquals/assertNotEquals/g" "${BUILD_DIR}/tests/src/Unit/YourExtensionServiceUnitTest.php"
   run ahoy test-unit
   assert_failure
diff --git a/.scaffold/tests/bats/make.bats b/.scaffold/tests/bats/make.bats
index d5c3cf5..7beed35 100644
--- a/.scaffold/tests/bats/make.bats
+++ b/.scaffold/tests/bats/make.bats
@@ -127,6 +127,8 @@ export BATS_FIXTURE_EXPORT_CODEBASE_ENABLED=1
   run make test-unit
   assert_success
 
+  assert_test_coverage
+
   sed -i -e "s/assertEquals/assertNotEquals/g" "${BUILD_DIR}/tests/src/Unit/YourExtensionServiceUnitTest.php"
   run make test-unit
   assert_failure
diff --git a/Makefile b/Makefile
index c3e8463..9b7486c 100644
--- a/Makefile
+++ b/Makefile
@@ -66,22 +66,22 @@ lint-fix:
 
 test:
 	pushd "build" >/dev/null || exit 1 && \
-	BROWSERTEST_OUTPUT_DIRECTORY=/tmp vendor/bin/phpunit && \
+	BROWSERTEST_OUTPUT_DIRECTORY=/tmp php -d pcov.directory=.. vendor/bin/phpunit && \
 	popd >/dev/null || exit 1
 
 test-unit:
 	pushd "build" >/dev/null || exit 1 && \
-	vendor/bin/phpunit --testsuite unit && \
+	php -d pcov.directory=.. vendor/bin/phpunit --testsuite unit && \
 	popd >/dev/null || exit 1
 
 test-kernel:
 	pushd "build" >/dev/null || exit 1 && \
-	vendor/bin/phpunit --testsuite kernel && \
+	php -d pcov.directory=.. vendor/bin/phpunit --testsuite kernel && \
 	popd >/dev/null || exit 1
 
 test-functional:
 	pushd "build" >/dev/null || exit 1 && \
-	BROWSERTEST_OUTPUT_DIRECTORY=/tmp vendor/bin/phpunit --testsuite functional && \
+	BROWSERTEST_OUTPUT_DIRECTORY=/tmp php -d pcov.directory=.. vendor/bin/phpunit --testsuite functional && \
 	popd >/dev/null || exit 1
 
 reset:
diff --git a/README.dist.md b/README.dist.md
index 37614d0..9362dbe 100644
--- a/README.dist.md
+++ b/README.dist.md
@@ -170,8 +170,8 @@ You may also run tests using the `phpunit` command directly:
 
 ```bash
 cd build
-./vendor/bin/phpunit tests/src/Unit/MyUnitTest.php
-./vendor/bin/phpunit --group=wip
+php -d pcov.directory=.. vendor/bin/phpunit tests/src/Unit/MyUnitTest.php
+php -d pcov.directory=.. vendor/bin/phpunit --group=wip
 ```
 
 ---
diff --git a/README.md b/README.md
index 75209e3..6302719 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ and push the code to [Drupal.org](https://drupal.org).
   - Drupal version matrix: `stable`, `canary` and `legacy`.
   - CI providers: [GitHub Actions](.github/workflows/test.yml)
     and [CircleCI](.circleci/config.yml)
-  - Code coverage with [codecov.io](https://codecov.io).
+  - Code coverage with https://github.com/krakjoe/pcov pushed to [codecov.io](https://codecov.io).
 - Develop locally using PHP running on your host using
   identical [`.devtools`](.devtools) scripts as in CI:
   - Uses [drupal-composer/drupal-project](https://github.com/drupal-composer/drupal-project)