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So we implemented a major feature in the last lesson.

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No we are going to implement another important feature which is to mark certain bookmarks as kid friendly

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.

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Nice thing is we already know the feature and the design that goes with it as we were using Treo as

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a case study in learning the Object-Oriented concepts.

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And just to recap the main idea is to maintain some prefab on the home page just pockets that is under

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this new tab.

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You will see only bookmarks that are suitable for kids.

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The way it works is we have regular bookmarks for all kinds of users but one staff members like editors

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and chief editors are using the system.

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Then they will see a special link for marking most kinds of bookmarks as kid friendly for certain bookmarks

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which are clearly not eligible for kid friendly status.

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Some special things will not be displayed.

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Examples would include bookmarks falling under categories such as January.

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In case you skipped the chapters on object oriented programming then you can check out the first lesson

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in the chapter that covers abstract classes and interfaces.

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That lesson was this requirement.

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But I guess the recap that we just did what most of the requirements.

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So it's a nice feature as having a separate tab exclusively for it is very useful.

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Now here is a class diagram for implementing this feature and we already implemented this and it is

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the missing pieces are the two methods generate profile you are an easy kid friendly eligible.

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Let's not worry about Jondrette profile you are for now and let's just implement easy get friendly eligible

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method.

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Once we implement East get friendly eligible method we will then implement the functionality for marking

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bookmarks as kid friendly.

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No here is good for any eligibility requirement for movies.

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If the movie is either horror or Thriller then the matter to read and falls otherwise it should read

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and true.

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Similarly for books if the book is either a philosophical or a self-help book then the method Trivett

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and falls.

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Finally with ramblings The method should read and a false.

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If the website is an other site not to implement is good for any eligible method we will follow what

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is called s driven development which is in short referred to as P-Diddy.

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Best do do double up ment is a software development process where the desk is is written before the

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functional code is written for a new feature.

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So you don't write the functional code first and then the best guess later you would write the desk

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as fast.

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And here are the main steps.

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So you are right the desk is along with some initial code that would cause the test to fail.

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Then you would write enough code to pass the test.

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You can repeat this process of.

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That's fast approach to incrementally add more functionality.

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That is you would add more deaths and then more logic and let us pass.

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Here are some real benefits.

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And you are already familiar with this slide as it is taken from the eclipse chapter.

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When we were discussing about unit tests so we know that such automated does will prevent new code from

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breaking the system.

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Basically it ensures program correctness at all points of time and that will improve programmer's confidence

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.

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But one important additional benefit of DDT is that it can also help you in better designing your methods

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.

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That's because DDT forces you to think through all the scenarios that would cover all the feature requirements

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.

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So you just tend to have a different thought process when doing.

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First approach as opposed to a later approach.

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So basically you are driving your design I think as you put it into practice and start using it regularly

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.

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Then you will be able to better appreciate its approach.

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OK that's DDD and let's get started now.

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So first thing that we need to do as I'd ease kid friendly eligible matter in the bookmark class.

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It really added as an abstract matter.

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So let's just go ahead and open the bookmark class.

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So there is a shortcut to open a class with this control shift.

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Our So this is a shortcut and let's just type and bookmark this right here at the top.

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So that's Control shift.

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And let's make this abstract.

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If you recall this is supposed to be abstract but since we are adding that abstract method only now

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so we're making the class abstract now so it will be public

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so that's that is kid friendly and vegetable matter and let's just provide the implementation and weblink

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selection is going to control shofer are let's do a blank.

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OK.

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Here it is.

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Now we need to implement it.

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So that's why it's giving compilation error.

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So let's say I unimplemented methods.

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So here is the stub.

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And let's just return true for now.

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Will be clear soon.

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Now let's just go ahead and I had a test case for this because we are going to follow the best driven

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approach.

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So let's just go here and add a new folder called test.

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So source folder called best and you might recall it from our G-Unit Allison and Eclipse chapter.

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Now within this let's add a package and it has to be the same package as the entities as of eyeblink

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because we are going to provide a desk for a web link.

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OK.

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So the package name will be Chrome

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and Cadiz.

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Now that's ired a G-Unit desk case since we are testing eyeblink needs to be Rabbe wabbling test.

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So that's the convention and we need to load the class which we are going to test.

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So it will be Lenk.

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So this is the class under test.

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And then hit next here.

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If you're not providing the class under test then this will not be highlighted here and you'll see only

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finish.

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So you should select the class under test head next.

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And this is the method that we want to test and it says I.

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G-Unit library to the barre But let's just say ok and G-Unit has been added here and this is the template

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class.

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Yes.

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If we run this it would fail not to think through our test cases.

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So the requirement is that this method is different the eligible should return false.

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If it's an adult website.

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So let's look at weblink class and see what field it has.

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It has a u r l it has a host and if you look at bookmark class it also has a title.

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Let's look at all of this here.

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So it has a title.

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So those are the three fields that we have.

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So what we can do is we can look for some keywords in these fields and if the keyword is present we

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build it and false otherwise we will return true.

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So let's take on our world as the key words are whatever your imagination suggests.

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So we can have the logic in this.

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If the word porn is present anywhere in the water or in Tipler then we see it and falls Similarly if

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the key word either appears anywhere in the hostname then where it involves But if it appears anywhere

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else in the order other than the host name then deleted it and true.

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Similarly if it if it appears only in title then also it untrue since we are following just doing the

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will up meant we will have to frustrate our best guesses and we will then write the actual logic.

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So let's do that.

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So let's go back into our Webling test and let's write five best cases.

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Let's just put some comments first.

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Just one

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.

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So for just one we will test if the key were born as and the you are ill.

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In this case it has to return a false.

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Next we will check f porn and Titan can never blink instance.

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And in this case also the matter has to return false.

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You know the third scenario as our gold in Horst.

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Right.

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So for does it has to return false.

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Now our dirt in your order but not in host this hitcher construe

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and only in this case also I took control.

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So let's just go ahead and build these test cases.

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So basically what we are what we have to do is create an instance of a weblink.

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And so that would be the book and then we will execute.

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We will invoke the east kid friendly eligibility method and then we but it does the output.

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So first let's create an instance so that would be the input and we have to create an instance for that

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let's just going to data store here because there is already some code for creating an instance you're

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just let's use this just won't go back.

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No this is a mark of sorted rodent's a weblink.

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So Paul and you are of that so let's just go here.

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Let's just put it here.

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It's on.

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So that's the good.

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So let's invoke a blank Dorward ease get friendlier richer.

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Now this returns a boolean.

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So let's assign it to a boolean reliable and that's quite at ease.

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Good friendly eligible.

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So it has to return a false.

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So we will use this method call as Surt falls from the asset class here which is important.

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Big group at amateur's.

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And the second parameter is the east kid friendly eligible method and if it returns false then we are

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good.

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But if in case if it returns true then it means that something is wrong.

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And then if needed then we need to print a nice message.

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So let's just say for porn on some meaningful message and you are still

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Maastricht and fonts.

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OK.

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So let's go ahead and ride the second best.

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So if this returns true if this method returns are true for this instance then this message will be

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strong.

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OK.

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So it's right the second best.

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Just remove this

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and the second just born has to be entitled.

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So let's just look at here.

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And for on AM.

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Is good for and true and it's also remove this here beaming anger.

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So now let's copy this whole thing and let's build a third discus.

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Now this is about Horst appearing and host sort of just changed this back to.

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And here is the host name.

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So let's just make it.

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I don't want assistance

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for I don't.

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Host.

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He's good for an angiogram was written for.

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So this is good for the fourth Test.

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Hoes are dead in your world but not in whole Sparta so he can hide it here under knocking holes.

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But so this is also good.

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So let's just say four hundred in your honor but not host not host vodka for this.

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It needs to return it.

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True.

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What does the matter.

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Has it done it true.

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Because the term our dirt is not appearing in host it needs to return.

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True.

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So for truculence concept true if East get friend eligible is assigned true then we are good.

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If not it will throw this exception and it will or must return true.

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Yeah we need to change this now.

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The final test here

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just sit in in the title The key word adult should appear in title.

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Yeah.

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So this is good.

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For and Dyken must return true.

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So those are all the best guess is that we have now let's just go ahead and run this wabbling best proceed

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.

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That is in error because we still did not tried the method itself or did not build our logic.

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So it says here in the US District has failed.

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So let's just go ahead and build our logic now.

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Let's go here

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on Daines.

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So Titlist by free an bookmarks so we cannot access or indirectly.

201

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So we have to use some of this get Teicher we have to use the get method here and to get her.

202

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So let's just go ahead and run this again

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.

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So now as you can see the first two deaths how free or how fast.

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Because we have written the logic for porn but it failed at the third one because at the third one we

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are passing our word.

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And that is unhorsed and we still do not have the logic for that.

208

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So it's time to write logic for the third one.

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So let's just say host Undine's.

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So even in this case it has to written as far as if the host has in-groups the key word order.

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So let's just go back.

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So it passed but it did the fourth one failed for the fourth one we are passing under a new order but

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not host part.

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Oh I think it's because of this which has to be beaming.

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It's just us.

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OK.

217

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So that was just an error

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.

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So now for sure it will work.

220

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So as you can see there are zero errors and zero failures.

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So we are good.

222

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So that's how that's one double up and is done.

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So we have written the past cases first and then we how bad our logic under that is how passed.

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OK.

225

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So that's for eyeblink.

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So let's just do four book on movie.

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So let me do it offline and then I'll come back and show you the code.

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OK.

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Here is the more we test.

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So that's the best guess for testing.

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The movie NDB and here is a method.

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So we are testing east kid friendly eligible method and here that here are the two test cases.

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So if you recall the condition is that if the movie is either a horror movie or a thriller movie then

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the method should read and false.

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So that was a condition and that's what we are testing here.

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So if that returns false then we are good and we are doing and assert false as we did for the wabbling

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.

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So so that's those are the two tests.

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And let's just go here three and here we are simply checking f genré is a.

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Equals equals horror our effort equals thriller than really good return for us which means that it's

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not good friendly.

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And so this is the book Best And For the book best the condition is that the books should not be either

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a philosophy book or self-help book.

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OK so once again we are looking at the genre field and we have two test cases for that.

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And so if we're going to this method it's very similar to the movie logic.

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So that's how you do best Doogan double up.

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You write that as Cozzens first and then you die.

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And the initial test should fail and then you build the logic and then that well that will pass the

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test.

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So that's how you would do it.

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And if any Duggal a person if they mess up what with the logic here then when the tests are run it is

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very likely that they will fail and then they will hold the double up or do fix the issue.

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OK.

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I also want to say that just go ahead and check out the frequently asked questions and G-Unit site and

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they have a real good compilation of frequently asked questions.

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So finally I'm also including a few important book references in the resource section and you may want

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to buy them at some point if you feel necessary.

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And that's about it for now.