symfony: Problem with installing simple-phpunit in docker

Symfony version(s) affected: 4.4.1 **phpunit-bridge version: 5.0.5 Description
When i want to install php unit (with ./vendor/bin/simple-phpunit install command) before copying all my src files (for prevent the reinstallation of vendors at every changes in the source code), the test i execute (before copying src files) fails

How to reproduce
Create a Dockerfile from a symfony project with:

# Copia solo dependencias y las instala
COPY composer.json composer.lock symfony.lock ./
RUN set -eux; \
	composer install --prefer-dist --no-scripts --no-progress --no-suggest; \
	composer clear-cache

RUN ./vendor/bin/simple-phpunit install

# copy only specifically what we need
COPY .env ./
COPY bin bin/
COPY config config/
COPY public public/
COPY src src/

RUN set -eux; \
	mkdir -p var/cache var/log; \
	composer dump-autoload --classmap-authoritative; \
	composer run-script --no-dev post-install-cmd; \
	chmod +x bin/console; sync

# Copia el codigo fuente a donde corresponde dentro del contenedor
COPY [".", "/var/www/"]

# Crea la base de datos y la carga con fixtures
RUN php bin/console doctrine:database:create --env=test --no-debug
RUN php bin/console doctrine:schema:update --env=test --force --no-debug
RUN php bin/console hautelook:fixtures:load --env=test

# Ejecuta testing
RUN ./vendor/bin/simple-phpunit tests # THIS FAILS

OUTPUT