fundMe.priceFeed() in fundMe.test

[Stark-Code]

It seems very strange to me that the following assertion passes.

const response = await fundMe.priceFeed()
assert.equal(response, mockV3Aggregator.address)

As per the constructor function in fundMe.sol we are setting priceFeed to an interface object.
priceFeed = AggregatorV3Interface(priceFeedAddress)
But then in the fundMe.test we are able to call priceFeed as if it is a function? Isn't it an object?
I checked console.log(priceFeed()) and it does indeed return an address, but why does calling an interface object return an address? And why can we call an interface object like that as if it is a function?

[alymurtazamemon]

@Stark-Code You are getting confused with the solidity feature of creating a default getter function for all public variables. Same with priceFeed, solidity creates a getter function that returns an address of the aggregator.

[Stark-Code]

I did forget about that! It's interesting that the getter function defaults to returning an address, good to know. Thanks for the response!