Merge branch 'improve-tests' into add-static-code-analysis

diff --cc composer.json
index 706ee3f0e4a4085ca38ba25c07137b97ce8747ad,36905f81d166204e4d1c2aabaccca06378b7f0ff..12df630ccf06672742bbee48faf793292b74eb57
--- 1/composer.json
--- 2/composer.json
+++ b/composer.json
@@@ -157,7 -156,7 +157,8 @@@
        },
        "scripts": {
                "test": "phpunit",
+               "test:unit": "phpunit -c tests/phpunit.xml --testsuite unit",
 +              "phpstan": "phpstan analyze --memory-limit 1024M --configuration .phpstan.neon",
                "lint": "find . -name \\*.php -not -path './vendor/*' -not -path './view/asset/*' -print0 | xargs -0 -n1 php -l",
                "docker:translate": "docker run --rm -v $PWD:/data -w /data friendicaci/transifex bin/run_xgettext.sh",
                "cs:install": "@composer install --working-dir=bin/dev/php-cs-fixer",