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And this solution, we're going to write some unit tests, remember, the first step and test driven

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development is to identify meaningful test cases and for the sake of expediency, already did that part

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for you.

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The first thing we're going to test is if the simulation can find the placeholder in each play.

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So inside game test Java, I'm going to write a unit test name to get placeholder test.

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Public void get placeholder test.

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And before we can do anything, we have to set up a before method that sets up our game object.

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Inside the method set up the game object, as you did in main.

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Let me do some cleaning up, remove the two variables and put the objects in directly.

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OK, now inside the unit test, we're going to assert equals.

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This test expects the value chaser when we call game get placeholder.

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In person to it, a play that equals the placeholder chaser chaser gets the next pass.

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And now inside game Java write code to make the test fail, I'll get a function that returns a string

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called Get Placeholder.

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And the unit test implies we need to pass in a string into our function again, it's really nice that

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our test determines the code that we write.

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And for now, we'll make the test failed by returning hello.

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The test fails now.

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We write code to make it pass.

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I told you to research how to get a string between two characters because we need to get the string

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between each pointy brackets.

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I'm not going to pretend like I knew how to do this off the top of my head because I remember a good

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developer doesn't memorize code.

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A good developer knows how to use the Internet to read documentation and find resources.

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And I'm going to show you how I did my research.

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I just looked up how to get a string between two characters.

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OK, the first link looks good, I'll have a look around for the best answer.

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I don't like this one just because I don't want to have to import an Apache Commons library to perform

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a simple task.

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There must be something that we can just use out of the box.

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OK, this answer looks really good.

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It seems that we can get a substring that starts at a certain inducts and ends at another.

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Normally at this point, I would look up the documentation just to have a little bit more information

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about this method.

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This method is from the string class because they're calling it from a string object.

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So I can just look up string documentation Java.

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JDK 11.

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I'll look up Substring and keep going until I find my method.

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Let me add a bracket to filter out some results and perfect.

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Here it is.

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So the substring starts at the index, you specify, and the end index is whatever you passan minus

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one.

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I know exactly how this works.

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Now I'm going to do it incorrectly.

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The first time for the sake of making a test that fails, I'll go back to the method and from the play

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string, I'm going to get the substring.

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That starts at the index of.

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The pointy bracket character and ends at the index of the other pointy bracket character.

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Run the test now, and it fails an expected chasers, but we got back chasers with a pointy bracket

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in the beginning.

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Look back at the documentation, it says the substring is starts at the index, we specify, and we

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want to start at the index that comes after the bracket.

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So we'll say plus one.

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Run the test.

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And now it works.

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Now, you might be wondering by that logic, shouldn't the substring also include the second pointy

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bracket?

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But look back at the documentation.

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Where the substring ends is whatever you pass in minus one.

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So our substring stops one index before the one we specified.

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This is why it's really important to read the documentation if you're not sure how a method works.

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Just take a few seconds to check out the documentation anyways.

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We spend enough time on this onto the second test case.

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We need to check if the simulation can replace the placeholder that it finds with a value.

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So inside game test Java, I'm going to write a unit test named to replace Placeholder Test.

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We'll make an assertion.

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And this test expects the sentence Katie gets the next pass.

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From a function we're going to call game dot, replace Placeholder.

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That receives the play Chaser gets the next pass.

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We're going to tell replace Placeholder what the placeholder is.

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And the value we want to replace the placeholder with Katie.

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And now inside game Java write code to make the test fail.

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I'm going to create a function that returns a string called Replace Placeholder.

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And the unit test implies we need to pass three parameters into our function.

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String play.

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String, placeholder and string value.

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Again, pretty cool that our test determines the code that we should write, and for now we'll make

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the test fail by returning.

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Hello?

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OK, the test fails now we need to write code to make it pass.

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I told you to research how to replace a string in a placeholder with another value.

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So I'll do just that.

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How to replace part of a string in Java.

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Take a look around.

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Wow, I like this answer.

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It's short and simple, let's just make sure we look up what replaced does exactly before we use it.

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I'll go to the documentation.

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Command control for Windows and look up, replace and cool takes two arguments and replaces all the

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occurrences of the first argument with the second one.

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Fair enough, back to the code from the play String Alchol Replace.

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And we will replace all occurrences of the placeholder with the value.

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And the test fails because we also have to replace these two pointy brackets.

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So I'm going to add those to the first parameter.

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Let's test it out.

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And our test passes.

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Can this code be any simpler?

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Not really.

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I think we're done in the next video, we'll pick up the remaining tasks.