expected.equals is not a function

[PaulRBerg]

Using:

• chai 4.2.0 • truffle 5.0.0-beta.1 • bignumber.js 8.0.1

I also tried chai 4.1.2, truffle 4.1.14 and 4.1.13 and also replaced bignumber.js with bn.js. Always the same error when doing:

should.be.bignumber.equal(100)

[PaulRBerg]

Doing more debugging, I delved in some really spooky results:

const assertion = (await this.token.totalSupply()).should.be.bignumber;
console.log(
  "(await this.token.totalSupply()).should.be.bignumber",
  assertion
);
console.log(
  "assertion.equal",
  assertion.equal
);
console.log(
  "assertion.equal(100)",
  assertion.equal(100)
);

Output is:

(await this.token.totalSupply()).should.be.bignumber Assertion {
  __flags:
   { ssfi: [Function: proxyGetter],
     lockSsfi: undefined,
     object: BigNumber { s: 1, e: 2, c: [Array] },
     message: null,
     bignumber: true } }
assertion.equal function () { [native code] }
...
     TypeError: expected.equals is not a function
      at Proxy.<anonymous> (test/base/chai-bignumber.js:57:18)
      at Proxy.<anonymous> (test/base/chai-bignumber.js:45:16)
      at Proxy.overwritingMethodWrapper (node_modules/chai/lib/chai/utils/overwriteMethod.js:78:33)
      at Context.<anonymous> (test/base/ERC20.test.js:31:19)
      at process._tickCallback (internal/process/next_tick.js:68:7)

This is weird because the log just right before that says that equals is a function with "native code".

[PaulRBerg]

Yup, same error happens when running the examples in the README:

var result = new BigNumber('100000000000000000').plus(1);
var expected = '100000000000000001';
result.should.be.bignumber.equal(expected);

[LogvinovLeon]

This happens because of a breaking change in BigNumber that wasn't reflected in chai-bignumber. equals was renamed to isEqualTo and chai-bignumber needs to be updated. https://github.com/MikeMcl/bignumber.js/blob/master/CHANGELOG.md#600

[asmarques]

Please update to the latest version.

[PaulRBerg]

This is awesome, thank you!