github.com/ethereum-optimism/optimism@v1.7.2/packages/core-utils/test/common/hex-strings.spec.ts

import { BigNumber } from '@ethersproject/bignumber'

/* Imports: Internal */
import { expect } from '../setup'
import {
  toRpcHexString,
  remove0x,
  add0x,
  fromHexString,
  toHexString,
  padHexString,
  encodeHex,
  hexStringEquals,
  bytes32ify,
} from '../../src'

describe('remove0x', () => {
  it('should return undefined', () => {
    expect(remove0x(undefined)).to.deep.equal(undefined)
  })

  it('should return without a 0x', () => {
    const cases = [
      { input: '0x', output: '' },
      {
        input: '0x1f9840a85d5af5bf1d1762f925bdaddc4201f984',
        output: '1f9840a85d5af5bf1d1762f925bdaddc4201f984',
      },
      { input: 'a', output: 'a' },
    ]
    for (const test of cases) {
      expect(remove0x(test.input)).to.deep.equal(test.output)
    }
  })
})

describe('add0x', () => {
  it('should return undefined', () => {
    expect(add0x(undefined)).to.deep.equal(undefined)
  })

  it('should return with a 0x', () => {
    const cases = [
      { input: '0x', output: '0x' },
      {
        input: '1f9840a85d5af5bf1d1762f925bdaddc4201f984',
        output: '0x1f9840a85d5af5bf1d1762f925bdaddc4201f984',
      },
      { input: '', output: '0x' },
    ]
    for (const test of cases) {
      expect(add0x(test.input)).to.deep.equal(test.output)
    }
  })
})

describe('toHexString', () => {
  it('should throw an error when input is null', () => {
    expect(() => {
      toHexString(null)
    }).to.throw(
      'The first argument must be of type string or an instance of Buffer, ArrayBuffer, or Array or an Array-like Object. Received null'
    )
  })

  it('should return with a hex string', () => {
    const cases = [
      { input: 0, output: '0x00' },
      { input: 48, output: '0x30' },
      {
        input: '0',
        output: '0x30',
      },
      { input: '', output: '0x' },
    ]
    for (const test of cases) {
      expect(toHexString(test.input)).to.deep.equal(test.output)
    }
  })
})

describe('fromHexString', () => {
  it('should return a buffer from a hex string', () => {
    const cases = [
      { input: '0x', output: Buffer.from('', 'hex') },
      {
        input: '0x1f9840a85d5af5bf1d1762f925bdaddc4201f984',
        output: Buffer.from('1f9840a85d5af5bf1d1762f925bdaddc4201f984', 'hex'),
      },
      { input: '', output: Buffer.from('', 'hex') },
      {
        input: Buffer.from('1f9840a85d5af5bf1d1762f925bdaddc4201f984'),
        output: Buffer.from('1f9840a85d5af5bf1d1762f925bdaddc4201f984'),
      },
    ]

    for (const test of cases) {
      expect(fromHexString(test.input)).to.deep.equal(test.output)
    }
  })
})

describe('padHexString', () => {
  it('should return return input string if length is 2 + length * 2', () => {
    expect(padHexString('abcd', 1)).to.deep.equal('abcd')
    expect(padHexString('abcdefgh', 3).length).to.deep.equal(8)
  })

  it('should return a string padded with 0x and zeros', () => {
    expect(padHexString('0xabcd', 3)).to.deep.equal('0x00abcd')
  })
})

describe('toRpcHexString', () => {
  it('should parse 0', () => {
    expect(toRpcHexString(0)).to.deep.equal('0x0')
    expect(toRpcHexString(BigNumber.from(0))).to.deep.equal('0x0')
  })

  it('should parse non 0', () => {
    const cases = [
      { input: 2, output: '0x2' },
      { input: BigNumber.from(2), output: '0x2' },
      { input: 100, output: '0x64' },
      { input: BigNumber.from(100), output: '0x64' },
      { input: 300, output: '0x12c' },
      { input: BigNumber.from(300), output: '0x12c' },
    ]
    for (const test of cases) {
      expect(toRpcHexString(test.input)).to.deep.equal(test.output)
    }
  })
})

describe('encodeHex', () => {
  it('should throw an error when val is invalid', () => {
    expect(() => {
      encodeHex(null, 0)
    }).to.throw('invalid BigNumber value')

    expect(() => {
      encodeHex(10.5, 0)
    }).to.throw('fault="underflow", operation="BigNumber.from", value=10.5')

    expect(() => {
      encodeHex('10.5', 0)
    }).to.throw('invalid BigNumber string')
  })

  it('should return a hex string of val with length len', () => {
    const cases = [
      {
        input: {
          val: 0,
          len: 0,
        },
        output: '00',
      },
      {
        input: {
          val: 0,
          len: 4,
        },
        output: '0000',
      },
      {
        input: {
          val: 1,
          len: 0,
        },
        output: '01',
      },
      {
        input: {
          val: 1,
          len: 10,
        },
        output: '0000000001',
      },
      {
        input: {
          val: 100,
          len: 4,
        },
        output: '0064',
      },
      {
        input: {
          val: '100',
          len: 0,
        },
        output: '64',
      },
    ]
    for (const test of cases) {
      expect(encodeHex(test.input.val, test.input.len)).to.deep.equal(
        test.output
      )
    }
  })
})

describe('hexStringEquals', () => {
  it('should throw an error when input is not a hex string', () => {
    expect(() => {
      hexStringEquals('', '')
    }).to.throw('input is not a hex string: ')

    expect(() => {
      hexStringEquals('0xx', '0x1')
    }).to.throw('input is not a hex string: 0xx')

    expect(() => {
      hexStringEquals('0x1', '2')
    }).to.throw('input is not a hex string: 2')

    expect(() => {
      hexStringEquals('-0x1', '0x1')
    }).to.throw('input is not a hex string: -0x1')
  })

  it('should return the hex strings equality', () => {
    const cases = [
      {
        input: {
          stringA: '0x',
          stringB: '0x',
        },
        output: true,
      },
      {
        input: {
          stringA: '0x1',
          stringB: '0x1',
        },
        output: true,
      },
      {
        input: {
          stringA: '0x064',
          stringB: '0x064',
        },
        output: true,
      },
      {
        input: {
          stringA: '0x',
          stringB: '0x0',
        },
        output: false,
      },
      {
        input: {
          stringA: '0x0',
          stringB: '0x1',
        },
        output: false,
      },
      {
        input: {
          stringA: '0x64',
          stringB: '0x064',
        },
        output: false,
      },
    ]
    for (const test of cases) {
      expect(
        hexStringEquals(test.input.stringA, test.input.stringB)
      ).to.deep.equal(test.output)
    }
  })
})

describe('bytes32ify', () => {
  it('should throw an error when input is invalid', () => {
    expect(() => {
      bytes32ify(-1)
    }).to.throw('invalid hex string')
  })

  it('should return a zero padded, 32 bytes hex string', () => {
    const cases = [
      {
        input: 0,
        output:
          '0x0000000000000000000000000000000000000000000000000000000000000000',
      },
      {
        input: BigNumber.from(0),
        output:
          '0x0000000000000000000000000000000000000000000000000000000000000000',
      },
      {
        input: 2,
        output:
          '0x0000000000000000000000000000000000000000000000000000000000000002',
      },
      {
        input: BigNumber.from(2),
        output:
          '0x0000000000000000000000000000000000000000000000000000000000000002',
      },
      {
        input: 100,
        output:
          '0x0000000000000000000000000000000000000000000000000000000000000064',
      },
    ]
    for (const test of cases) {
      expect(bytes32ify(test.input)).to.deep.equal(test.output)
    }
  })
})