Testing

There are a number of helper functions to make testing easier::

import { assert, getChannelState, updateState, assertStateEqual } from 'client/testing'

describe('confirm deposit', () => { const preDepositState = getChannelState('empty', { balanceWei: [0, 0], pendingDepositWei: [6, 9], })

  it('should add the correct amount', () => {
     let actual = confirmDeposit(preDepositState)
     assertStateEqual(actual, {
        balanceWei: [6, 9],
        pendingDepositWei: [0, 0],
     })
  })

})

Notice that:

1. The testing library provides four "default" states: "empty" (where all fields are zero, except for the txCount, which is [1, 1] or 1 for channels and threads, respectively), and "full", where each field has a unique value (this is useful for testing, ex, signature functions).

   empty channel state::

   contractAddress: '0xCCC0000000000000000000000000000000000000' user: '0xAAA0000000000000000000000000000000000000' recipient: '0x2220000000000000000000000000000000000000' balanceWei: [ '0', '0' ] balanceToken: [ '0', '0' ] pendingDepositWei: [ '0', '0' ] pendingDepositToken: [ '0', '0' ] pendingWithdrawalWei: [ '0', '0' ] pendingWithdrawalToken: [ '0', '0' ] txCount: [ 1, 1 ], threadRoot: '0x0000000000000000000000000000000000000000000000000000000000000000' threadCount: 0 timeout: 0 sig: [ '', '' ]

   full channel state::

   contractAddress: '0xCCC0000000000000000000000000000000000000' user: '0xAAA0000000000000000000000000000000000000' recipient: '0x2220000000000000000000000000000000000000' balanceWei: [ '1', '2' ] balanceToken: [ '3', '4' ] pendingDepositWei: [ '4', '5' ] pendingDepositToken: [ '6', '7' ] pendingWithdrawalWei: [ '8', '9' ] pendingWithdrawalToken: [ '10', '11' ] txCount: [ 13, 12 ] threadRoot: '0x1414140000000000000000000000000000000000000000000000000000000000' threadCount: 14 timeout: 15 sig: [ 'sighub0000000000000000000000000000000000000000000000000000000000', 'siguser0000000000000000000000000000000000000000000000000000000000' ]

   empty thread state::

   contractAddress: '0xCCC0000000000000000000000000000000000000' user: '0xAAA0000000000000000000000000000000000000' sender: '0x2220000000000000000000000000000000000000' receiver: '0x3330000000000000000000000000000000000000' txCount: 1 balanceWei: [ '0', '0' ] balanceToken: [ '0', '0' ] sigA: ''

   full thread state::

   contractAddress: '0xCCC0000000000000000000000000000000000000' user: '0xAAA0000000000000000000000000000000000000' sender: '0x2220000000000000000000000000000000000000' receiver: '0x3330000000000000000000000000000000000000' balanceWei: [ '1', '2' ] balanceToken: [ '3', '4' ] txCount: 22 sigA: 'sigA0000000000000000000000000000000000000000000000000000000000'

2. All operations support "shorthands" for values; internally, balanceWei: [5, 10] is expanded to balanceWeiHub: 6, balanceWeiUser: 9. This is done through two functions: expandChannelSuccinct, expandThreadSuccinct, which expands the fields in a "succinct" state to a verbose state, and makeSuccinctChannel and makeSuccinctThread, which do the opposite.

   Note that these functions can accept partial states, and combinations of succinct and verbose states.

   Additionally, they will always normalize numeric values to strings.

   For example::

   verbose = expandSuccinctChannel({ . balanceWei: [6, 9], . balanceTokenUser: 69, . timout: 5, . }) verbose { balanceWeiHub: '6', balanceTokenUser: '9', balanceTokenUser: '69', timeout: 5, } makeSuccinctChannel(verbose) { balanceWei: ['6', '9'], balanceToken: ['0', '69'], timeout: 5, }

Additionally, useful helper functions:

• mkAddress(prefix): Generates an address by suffixing prefix with zeros::

  mkAddress('0x1234') '0x1234000000000000000000000000000000000000'

• mkHash(prefix): Generates a hash by suffixing prefix with zeros::

  mkHash('0xab') '0xab00000000000000000000000000000000000000000000000000000000000000'