Coding standard issues in tests, demo form

clientside_validation_demo/src/Form/ClientsideValidationDemoForm.php ✗ 1 more
line 7 Unused use statement
111 Short array syntax must be used to define arrays
141 Functions must not contain multiple empty lines in a row; found 2 empty lines
tests/src/FunctionalJavascript/ClientsideValidationTest.php
23 Missing short description in doc comment
146 Private method name "ClientsideValidationTest::_validateAssertions" is not in lowerCamel format