Creating Test Class for Einstein Bot Invocable Apex Class to Search Articles

public with sharing class Bot_SearchFAQ {
    public class FAQSearchInput{
        @InvocableVariable(required=true)
        public String sKeyword;
    }
    public class FAQSearchOutput{
        @InvocableVariable(required=true)
        public String sFAQSearchResult;
    }
    @InvocableMethod(label='Search FAQ')
    public static List<FAQSearchOutput> searchFAQ(List<FAQSearchInput> faqSearchInput) {
        String sArticleBaseUrl = getCommunityArticleBaseUrl();
        String sKeyword = faqSearchInput[0].sKeyword;
        String sQuery = 'FIND \'' + String.escapeSingleQuotes(sKeyword) + '\' IN NAME FIELDS RETURNING Knowledge_Article__kav(Id, Title, Chatbot_URL__c, Chatbot_Resolution__c WHERE PublishStatus = \'Online\' AND Language = \'en_US\' AND IsVisibleInPkb = true) WITH SNIPPET (target_length=255) LIMIT 1';
        System.debug(sQuery);
        Search.SearchResults searchResults = Search.find(sQuery);
        List<Search.SearchResult> articlelist = searchResults.get('Knowledge_Article__kav');
        System.debug('articlelist: ' + articlelist);
        String sFAQSearchResult = '';
        for (Search.SearchResult searchResult : articlelist)        {
            Knowledge_Article__kav article = (Knowledge_Article__kav)searchResult.getSObject();
            String sArticleSummary;
            //String sSnippet = searchResult.getSnippet('Knowledge_Article__kav.Resolution__c');
            String sSnippet = article.Chatbot_Resolution__c;
            sArticleSummary = summarizeArticleForBot(sArticleBaseUrl, article, sSnippet);
            System.debug('sArticleSummary: ' + sArticleSummary);
            sFAQSearchResult = sFAQSearchResult + sArticleSummary;
        }
        if (sFAQSearchResult == '') sFAQSearchResult = 'No result found.';
        List<FAQSearchOutput> faqSearchOutputs = new List<FAQSearchOutput>();
        FAQSearchOutput faqSearchOutput = new FAQSearchOutput();
        faqSearchOutput.sFAQSearchResult = sFAQSearchResult;
        faqSearchOutputs.add(faqSearchOutput);
        system.debug(faqSearchOutput);
        return faqSearchOutputs;
    }
    public static String summarizeArticleForBot(String sArticleBaseUrl, Knowledge_Article__kav article, String sSnippet){
        String sSummary, sURL;
        sURL = article.Chatbot_URL__c;
        //remove highlight HTML tag <mark>
        sSummary = 'Here is what I found: ' + sSnippet.replaceAll('<[^>]+>',' ') + '\n' + 'To read more click here:\n' + sURL + '\n';
        return sSummary;
    }
    public static string getCommunityArticleBaseUrl()
    {
        List<Network> communityNetworks = [SELECT Id FROM Network WHERE Name='Community Support'];
        String sArticleBaseUrl = '';
        if (communityNetworks.size()>0)
        {
            Network communityNetwork = communityNetworks[0];
            String sLoginUrl = Network.getLoginUrl(communityNetwork.id);
            sArticleBaseUrl = sLoginUrl.replace('/login', '/article/');
            System.debug('MyDebug - Community Login URL: ' + sLoginUrl);
            System.debug('MyDebug - Article Base URL: ' + sArticleBaseUrl);
        }
        return sArticleBaseUrl;
    }
}

TEST CLASS

@isTest
private class Bot_SearchFAQ_Test{
  @testSetup
  static void setupTestData(){   
    Knowledge_Article__kav knowledge_article_kav_Obj = new Knowledge_Article__kav(IsVisibleInPkb = true, Language = 'en_US', Title = 'Test Text?', Details__c='Test Text.', UrlName = 'UrlName760', Chatbot_Resolution__c = 'Test Text', Chatbot_URL__c = 'http://test71.com');
    Insert knowledge_article_kav_Obj;
    Knowledge_Article__kav newArticle = [SELECT Id, KnowledgeArticleId FROM Knowledge_Article__kav WHERE id=:knowledge_article_kav_Obj.Id];
    String articleId = newArticle.KnowledgeArticleId;
    KbManagement.PublishingService.publishArticle(articleId, true);
  }
  static TestMethod void test_searchFAQ_UseCase1(){
    test.startTest();
    Bot_SearchFAQ.faqSearchInput input = new Bot_SearchFAQ.faqSearchInput();
    input.sKeyword = 'Test Text?';
    List<Bot_SearchFAQ.faqSearchInput> listInput = new List<Bot_SearchFAQ.faqSearchInput>();
    listInput.add(input);
    Bot_SearchFAQ.searchFAQ(listInput);
    test.stopTest();
  }
}