diff --git a/README.md b/README.md
index 4302671..405ea9d 100644
--- a/README.md
+++ b/README.md
@@ -573,6 +573,12 @@ Some suggestions:
 
 ### Script en Bash
 
+The runner includes a ready-made script for this: [`host-tools/testrunner.sh`](host-tools/testrunner.sh). It updates the runner and runs the 4 steps. It also runs the report when a test fails, always cleans up, and stops when another run is still active. Replace `/path/to/phpunit-test-runner` with the directory of your clone, and use it in place of the example below:
+
+```bash
+bash /path/to/phpunit-test-runner/host-tools/testrunner.sh
+```
+
 This is a simple example of a Bash script that could be placed in the directory above the software. For example, at `/home/wptestrunner/`.
 
 ```bash
diff --git a/host-tools/testrunner.sh b/host-tools/testrunner.sh
new file mode 100755
index 0000000..d9927e8
--- /dev/null
+++ b/host-tools/testrunner.sh
@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+#
+# Run the full test cycle in one step: update the runner, prepare, test,
+# report and clean up.
+#
+# Use this after the runner is set up and its .env file is configured
+# (database credentials, and WPT_REPORT_API_KEY if you report results).
+#
+# Usage:
+#   ./host-tools/testrunner.sh
+#
+# Example cron entry (every 4 hours). Replace /path/to/phpunit-test-runner with
+# the directory of your clone. The script finds the runner from its own location,
+# so it does not need to be started from that directory:
+#   0 */4 * * * /path/to/phpunit-test-runner/host-tools/testrunner.sh >> /path/to/testrunner.log 2>&1
+#
+# Optional environment variables:
+#   WPT_RUNNER_DIR   Path to the runner directory. Default: the parent of this script's directory.
+#   WPT_SKIP_UPDATE  Set to 1 to skip "git pull" (for example, when you test local changes).
+#
+# The PHP binary comes from WPT_PHP_EXECUTABLE in .env (default: php), the
+# same setting that the runner uses to run the tests.
+#
+# Exit status: 0 when every step succeeds, 1 when any step fails.
+
+set -uo pipefail
+
+RUNNER_DIR="${WPT_RUNNER_DIR:-$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)}"
+
+cd "$RUNNER_DIR" || { echo "Error: cannot open runner directory: $RUNNER_DIR" >&2; exit 1; }
+
+if [[ ! -f .env ]]; then
+	echo "Error: $RUNNER_DIR/.env not found. Copy .env.default to .env and configure it first." >&2
+	exit 1
+fi
+
+# Stop when another run is still active, for example a slow run that cron starts again.
+if command -v flock >/dev/null 2>&1; then
+	exec 9>"${TMPDIR:-/tmp}/wpt-testrunner-$(id -u).lock"
+	if ! flock -n 9; then
+		echo "Another test run is still active. Stopping." >&2
+		exit 1
+	fi
+fi
+
+if [[ "${WPT_SKIP_UPDATE:-0}" != "1" ]]; then
+	git pull --ff-only origin master || echo "Warning: could not update the runner. Continuing with the current version." >&2
+fi
+
+# shellcheck source=/dev/null
+source .env
+
+read -r -a PHP <<< "${WPT_PHP_EXECUTABLE:-php}"
+
+status=0
+
+# Always clean up, also when a step fails or the run is stopped.
+trap '"${PHP[@]}" cleanup.php || status=1' EXIT
+
+if ! "${PHP[@]}" prepare.php; then
+	echo "Error: prepare.php failed. Skipping the tests and the report." >&2
+	exit 1
+fi
+
+# test.php exits with a non-zero status when a test fails.
+# Run the report anyway, so that the failures are reported.
+"${PHP[@]}" test.php || status=1
+"${PHP[@]}" report.php || status=1
+
+trap - EXIT
+"${PHP[@]}" cleanup.php || status=1
+
+exit "$status"