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Instructor: We're now on to the very last step

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of our test right here.

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So we need to again

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get a reference to our textarea component

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and make sure that it has received the correct value.

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So to do so, we're again going to rely upon enzyme.

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Yes, we really rely upon enzyme

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when we are testing React components.

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So we're gonna very quickly go and look

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at some documentation on enzyme one last time,

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and we'll be able to write out our expectation right here.

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Now before we look at the enzyme documentation

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I wanna very quickly remind you

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that inside of our CommentBox component,

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we have our textarea right here.

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And what we're really trying to test

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inside this test that we're working on right now

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is making sure that that textarea

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receives the correct value prop.

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That's key right here.

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It's the value prop that you and I really care about.

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Is if we pass in the correct value prop right here

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then we know that React is going to essentially take it

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from there, and definitely show that correct input

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inside that textarea.

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So rather than saying that we want to figure out

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what value the textarea has,

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it might be a little bit more accurate to say

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that we want to verify

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that the textarea received the correct value prop.

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So with that in mind,

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if we flip back over to our enzyme documentation,

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again underneath our Full DOM Rendering section right here,

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we can find a method called, there we go, prop with key.

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So the prop function right here allows us

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to pull the prop that is passed

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to any element within our component.

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So you and I can find that textarea element,

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and then we can call the prop method on it

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and ask it to retrieve the value prop

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that was assigned to it.

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And that should retrieve the string that we had passed

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right here.

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So then we can write out a simple expectation and say,

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yes, we passed in the correct value of this.state.comment.

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So that's the idea,

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that's how we're going to actually test out our textarea.

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We're going to pull a prop off it and make sure we passed in

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the correct prop.

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So I'm gonna flip back over to my CommentBox test file.

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And then right down here, we'll write out

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our full expectation.

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So we're going to expect that,

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excuse me, not component but wrapped.find textarea.

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So we're going to get a brand new reference

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to our textarea element.

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Then we're going to pull off the prop of value.

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'Cause that's the name of the prop that we passed

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to that element.

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And then finally, outside of both sets

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of parentheses right here,

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we're gonna do a toEqual

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and we're gonna make sure that that prop value right there

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equals the string, new comment.

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'Cause that's what we had tricked our component

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into thinking the user had entered.

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I'm gonna really quickly give myself some space here,

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and I'm gonna say toEqual new comment, like so.

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So that's it for the test.

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I'm gonna save this test file,

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and I'll flip back over to my terminal,

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and it looks like that new test is passing.

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Now as usual, let's make sure that we make this test fail.

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And I just realized, I think we skipped that step

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on our last test as well.

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So let's make both these fail very quickly.

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So on the test up here,

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I will say toEqual 2 on both those tests.

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And then on the test we just put together,

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I'm gonna say toEqual

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about just some random string, like so.

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So now if I save this file and flip back over,

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I will expect to see all three of those tests failing.

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Or all three of those expectations really.

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So now on has a text area that users can type [Interviewer],

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we expected to see that gibberish right there

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but we actually got the string new comment, which is great.

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And then up here, has a text area and a button.

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In a, essentially, we said that we expected two

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but we actually received one button or text area.

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So awesome.

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It looks like our tests are working correctly.

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I'm gonna flip back over

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and change these all back to the correct values.

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And I'll do my toEqual of new comment as well.

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So one more time, I'll make sure everything

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is still passing, and we're great.

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Cool, so I think that's it for this test right here.

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Let's continue on the next section

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and I think we got one more test

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around our CommentBox component.

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So we'll take care of it in that video.