A Mockito ArgumentMatcher for java 8 Optional of array objects.

OptionalArrayArgumentMatcher.java

    @SuppressWarnings("rawtypes")
    public class OptionalArrayArgumentMatcher extends ArgumentMatcher<Optional> {

        private final Optional compareWith;

        public OptionalArrayArgumentMatcher(Optional optionalArray) {
            this.compareWith = optionalArray;
        }

        @Override
        public boolean matches(Object argument) {
            Optional arg = (Optional) argument;
            if (!compareWith.isPresent() && !arg.isPresent()) {
                return true;
            }
            if (compareWith.isPresent() != arg.isPresent()) {
                return false;
            }
            Object[] argArray = (Object[]) arg.get();
            Object[] compareWithArray = (Object[]) compareWith.get();
            return Arrays.equals(argArray, compareWithArray);
        }

    }