public void DeleteStopWord_WorksCorrectly()
{
var stopwords = new StopWords();
var filter = new StopWordsFilter(stopwords);
var input = new List <string> {
"Abc", "of", "cba", "IN", "the", "car"
};
stopwords.Remove("iN");
filter.Filter(input).Should().BeEquivalentTo(new List <string> {
"abc", "in", "cba", "car"
});
}