Unit test: Internal Salesforce Error

Solution.cls

//Throws Internal Salesforce Error
try {
    insert new ContentDocumentLink();
} catch (Exception exceptionInstance){
}

//Deploys without errors
try {
    ContentVersion cv = new ContentVersion();

    cv.Title = 'Test';
    cv.PathOnClient = 'Test';
    cv.VersionData = Blob.valueOf('Test');
    
    //Also triggers ContentDocument & ContentDocumentLink trigger, can't insert ContentDocument directly
    insert cv;
} catch (Exception exceptionInstance) {
}