How to write the javascript test code on whether a smart contract function is successfully executed or not?

Question

I wrote a lottery smart contract and gonna to test an "enter" functionality of the smart contract.

The below code is javascript test code for the "enter" function of the smart contract.

When I call "enter" function with less than 0.01 ether, how can I continue the test code? (//??? part below contract.enter(...) line) In the enter function of lottery smart contract, the execution will be restricted if the msg.value is less than 0.01 ether. How can I detect it in the test code?

Answer 1

mercifully, you don't need the try catch blocks if you're expecting it to throw an error

chai test syntax

await expect(myContract.callFunc()).to.be.revertedWith("my expected error message")

or if you don't want to check the message

await expect(myContract.callFunc()).to.be.reverted

or

await expect(myContract.callFunc()).to.throw

and for test that return a value you might use something like

    // expecting number 2
    expect(await myContract.getNumber()).to.equal(2)