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I want to check if the ether balance of an account decreased after the transaction using changeEtherBalance I tried to follow the waffle docs but couldn't do it either.

        await token.connect(addr1).mint(1, {value: ethers.utils.parseEther("0.1")}))
        .to.changeEtherBalance(addr1, -(ethers.utils.parseEther("0.1"))
        );

Error:

Error: overflow (fault="overflow", operation="BigNumber.from", value=-100000000000000000, code=NUMERIC_FAULT, version=bignumber/5.5.0)

2 Answers 2

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You can see more information here. Basically you should send the recipient and the amount:

await expect(() => wallet.sendTransaction({to: walletTo.address, value: 200}))
  .to.changeEtherBalance(walletTo, 200);
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  • But I want to check the new balance of the wallet that sent the value, so the result is going to be less than the original one.
    – n3n3
    Nov 28, 2021 at 20:54
  • Then I dont think changeEtherBalance is what you need to use, you need another validation thats checks the new balance and compares it with the previous one
    – Julissa DC
    Nov 29, 2021 at 1:45
  • I know I can do it by simply using ethers.provider.getBalance(address), but really wanted to try using this method. Thanks anyway :)
    – n3n3
    Nov 29, 2021 at 9:10
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I just found what I should have done, it's pretty simple:

await token.connect(addr1).mint(1, {value: ethers.utils.parseEther("0.1")}))
        .to.changeEtherBalance(addr1, ethers.utils.parseEther("-0.1"));

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