<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
  <component name="PhpUnit">
    <phpunit_settings>
      <PhpUnitSettings load_method="CUSTOM_LOADER" configuration_file_path="$PROJECT_DIR$/phpunit.xml.dist" custom_loader_path="$PROJECT_DIR$/vendor/autoload.php" phpunit_phar_path="" use_configuration_file="true" />
    </phpunit_settings>
  </component>
</project>
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
  <component name="PhpProjectSharedConfiguration" php_language_level="7.1" />
  <component name="PhpUnit">
    <phpunit_settings>
      <PhpUnitSettings load_method="CUSTOM_LOADER" configuration_file_path="$PROJECT_DIR$/phpunit.xml.dist" custom_loader_path="$PROJECT_DIR$/vendor/autoload.php" phpunit_phar_path="" use_configuration_file="true" />
    </phpunit_settings>
  </component>
</project>

Set project PHP language level to 7.1
Set project PHP language level to 7.1
