Lesson-14 basicNft testing questions

[TimeKeyRoll]

could anyone help me to understand How this line is written?
I dint get this code of line.

assert.equal(tokenURI, await basicNft.TOKEN_URI())

BTW The whole code is :

it("Allows users to mint an NFT, and updates appropriately", async function () {
                  const txResponse = await basicNft.mintNft()
                  await txResponse.wait(1)
                  const tokenURI = await basicNft.tokenURI(0)
                  const tokenCounter = await basicNft.getTokenCounter()

                  assert.equal(tokenCounter.toString(), "1")
                  assert.equal(tokenURI, await basicNft.TOKEN_URI())
```

[alymurtazamemon]

@TimeKeyRoll Let me simplify it;

Basically asserts are the statements that check for equality, less than, or greater than of two given things in its parameters and return either true or false based on the result. And this comes from the dependency const { assert, expect } = require("chai");.

Now here, we are using assert.equal means we want to check the equality of two things, that are, 1. tokenURI and 2. await basicNft.TOKEN_URI().

We are testing whether both are equal or not.

[alymurtazamemon]

@TimeKeyRoll We are adding await here in the second argument assert.equal(tokenURI, await basicNft.TOKEN_URI()) because basicNft.TOKEN_URI() function will take time to give a result so we want to wait for its result so we can compare it with the first argument.

[TimeKeyRoll]

Got it @alymurtazamemon thank you very much.

[krakxn]

What exactly is the doubt here?

"could anyone help me to understand How this line is written?" Is it the way the line is written or comprehending how it works?

[TimeKeyRoll]

I don't understand why 'assert.equal' has 'await' in it. And i know these function comes from chai and I understand what is Chai and it's function. But what I don't understand how it's calculating and trying to be Equivalent. How come the two could be equal!?

I think I need to more clear when asking question. Lol thanks

[krakxn]

Oh, I see.

assert.equal essentially "compares" whether the parameters provided to it are equal or not.

For example,

let a = 4
let b = "4"
assert.equal(a,b) // returns false

similarly,

let a = 100
let b = 100
assert.equal(a,b) // returns true

[TimeKeyRoll]

Oh man. I guess I always fail to make you understand what I'm asking. Lol

I know what is equal and Equivalent. And i do know how these functions are working with chai
Because it's gonna have assert, expect or should which needs to be equal to something. I get that.

My question was simple but either I failed to express or I don't know what went wrong. Lol

Question- why do we have 'await' in the 'assert. equal' but any way this was answered by @alymurtazamemon which is mentioned above.

But glad you tried to help. And i will also try to be more precise and clear when it comes to asking questions. great job @krakxn.

[krakxn]

Okay, so await is almost always--not just in this case--used wherever a statement (in this case, basicNft.TOKEN_URI()) takes time to evaluate, and await acts like a "barrier" and does not allow the compiler to evaluate any further before this statement is evaluated.

This is the case because programming languages are synchronous, which means everything happens simultaneously, i.e. several lines of code are evaluated together; this is why await is used--to stop further evaluation until that specific statement (where await is used) is done evaluating.