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In this video as promised it'll be up to you to write a couple of new test cases for a couple of new

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functions.

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Now I'll be providing you with the functions you'll be testing those functions will live over in math

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dot J S and will write the test cases right inside of this file so to kick things off.

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Let's go ahead and grab the functions we'll be testing.

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You can find those over at links dot Meade dot I O forward slash node test.

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This is going to redirect us over to a get hub just just a little code snippet.

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This contains the two functions you'll be testing as well as the challenged comments outlining what

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I'd like you to do.

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What I'm gonna do is grab all 15 lines copy them to the clipboard and we'll be pasting them in math

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dot J S JUST BELOW THE calculate tip function that we created in the last lesson.

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So now we have three functions inside of here.

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And it's time to talk about what exactly I'd like you to get done.

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So the big picture goal is to test the temperature conversion functions up above 1 converts Fahrenheit

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into Celsius and the other converts Celsius into Fahrenheit.

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You'll be writing to test cases one for each function.

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So down below you need to start by exporting both functions from this file and loading them into our

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test suite file.

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Then you'll create those two tests should convert thirty two degrees Fahrenheit to zero degrees Celsius

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will be the first one.

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In that case you want to call this function with the correct Fahrenheit value and assert that you get

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the correct Celsius value back.

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The other one should convert zero degrees Celsius to thirty two degrees Fahrenheit is going to use this

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function Celsius to Fahrenheit.

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You'll pass in 0 as the Celsius temperature and assert using expect that you get back the number thirty

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two last up.

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You go ahead and run the test suite making sure that you're two new test cases show up and are passing.

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So take some time to knock that out.

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Don't forget to run the test suite and when you're done come back and click play

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how that go.

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Let's kick things off by exporting both of these functions down below alongside of calculate tip.

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So first up we have Fahrenheit to Celsius.

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Select it from my autocomplete list and then we also have Celsius to Fahrenheit autocomplete can't work

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if I don't start to type things correctly.

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There is the option we want and now we're actually going to head over to the test suite file itself

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load those in and write the test cases.

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So for me I'm going to take these challenge comments.

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Cut them out I'll remove the empty spaces and save this file.

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I'll bring the challenge comments over here so we can continue to work through it.

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Down below I can remove the Y test comment and replace it with the challenge ones.

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Now the first thing we have to do is make sure we do load those two functions in.

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So alongside of calculate tip I'll be grabbing Celsius to Fahrenheit as well as Fahrenheit 2 Celsius

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and down below.

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We're gonna set up those two test cases we'll just do one at a time.

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So first up a new test with the following name should convert 32 degrees Fahrenheit to zero degrees

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Celsius.

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We'll set up the function and for this one we'll be calling.

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Fahrenheit to Celsius.

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So right here const i can go ahead and create a variable like temp or something similar.

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And this will be the return value from what comes back from calling Fahrenheit 2 Celsius.

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The function we're actually trying to test now in this case I'll pass thirty two degrees in Fahrenheit

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in and I would expect to get zero degrees in Celsius back so I'll use expect to expect something about

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the temperature.

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Expecting that it equals using it to be the number zero.

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Perfect.

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Now we could add the second test case but let's go ahead and just run this one to make sure it's passing

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before we go any further.

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And if it is passing we'll move on to the second.

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Right here it is.

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So down below that means a another call to test providing the name.

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In this case it is in the other direction.

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So should convert zero degrees in Celsius to thirty two degrees in Fahrenheit and we'll set up our function

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right here.

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Once again we can create a variable like temp or temperature or result or whatever makes sense for you

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and then we'll call the function we're trying to test.

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That would be Celsius 2 Fahrenheit passing in the initial value of 0 and expecting the result of 32

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degrees.

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So right here I'm expecting something about the temperature.

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Expecting that it equals using to be the number thirty two.

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Now with this in place we can remove the challenge comments as the only thing left to do is run the

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test suite for the final time.

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So I will remove it.

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Save the file rerun the test sweet and hopefully we have for passing test cases.

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And right here we do so with those two new test cases in place.

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You were able to verify that these functions are working as expected and if the code was to ever be

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changed or refactor it in the future we would be notified if it broke the functionality because the

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test cases we created would fail.

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So now that we have this in place that's where we're going to stop for this video.

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So far in this section we've covered the very basics of testing.

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We've set up just we explored the assertion library and tested some relatively simple functions.

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And the next lesson we're going to continue on testing more advanced functions and focusing on testing

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the contents of the task manager app.

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I'm excited to get to that.

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So let's jump right in to the next lesson.