@isTest
private class LastCommentComponentTest {
    @isTest
    static void publicOnlyTest(){
        Case c = new Case(subject = 'apex test case');
        insert c;
        CaseComment comment1 = new CaseComment(isPublished = false, parentId = c.id, commentBody = 'private apex test comment');
        insert comment1;
        CaseComment comment2 = new CaseComment(isPublished = true, parentId = c.id, commentBody = 'public apex test comment');
        insert comment2;
        CaseComment comment3 = new CaseCOmment(isPublished = false, parentId = c.id, commentBody = 'private apex test comment #2');
        insert comment3;
        
        Test.startTest();
        LastCommentComponent controller = new LastCommentComponent();
        controller.caseId = c.id;
        controller.onlyPublic = true;
        CaseComment result = controller.getComment();
        Test.stopTest();
        
        System.assertEquals(result.id,comment2.id);
    }
    
    @isTest
    static void allTest(){
        Case c = new Case(subject = 'apex test case');
        insert c;
        CaseComment comment1 = new CaseComment(isPublished = false, parentId = c.id, commentBody = 'private apex test comment');
        insert comment1;
        CaseComment comment2 = new CaseComment(isPublished = true, parentId = c.id, commentBody = 'public apex test comment');
        insert comment2;
        CaseComment comment3 = new CaseComment(isPublished = false, parentId = c.id, commentBody = 'private apex test comment #2');
        insert comment3;
        
        Test.startTest();
        LastCommentComponent controller = new LastCommentComponent();
        controller.caseId = c.id;
        controller.onlyPublic = false;
        CaseComment result = controller.getComment();
        Test.stopTest();
        System.assertEquals(result.id,comment3.id,'Got :'+result+' instead of '+[SELECT id, createdDate, commentBody FROM CaseComment WHERE id = :comment3.id LIMIT 1]);
    }
    
    @isTest
    static void noCommentTest(){
        Case c = new Case(subject = 'apex test case');
        insert c;
        CaseComment comment1 = new CaseComment(isPublished = false, parentId = c.id, commentBody = 'private apex test comment');
        insert comment1;
        
        Test.startTest();
        LastCommentComponent controller = new LastCommentComponent();
        controller.caseId = c.id;
        controller.onlyPublic = true;
        CaseComment result = controller.getComment();
        Test.stopTest();
        
        System.assertEquals(null,result);
    }
}