const assert = require('assert')
const txStateHistoryHelper = require('../../app/scripts/lib/tx-state-history-helper')
const testVault = require('../data/v17-long-history.json')
describe('tx-state-history-helper', function () {
it('migrates history to diffs and can recover original values', function () {
testVault.data.TransactionController.transactions.forEach((tx, index) => {
const newHistory = txStateHistoryHelper.migrateFromSnapshotsToDiffs(tx.history)
newHistory.forEach((newEntry, index) => {
if (index === 0) {
assert.equal(Array.isArray(newEntry), false, 'initial history item IS NOT a json patch obj')
} else {
assert.equal(Array.isArray(newEntry), true, 'non-initial history entry IS a json patch obj')
}
const oldEntry = tx.history[index]
const historySubset = newHistory.slice(0, index + 1)
const reconstructedValue = txStateHistoryHelper.replayHistory(historySubset)
assert.deepEqual(oldEntry, reconstructedValue, 'was able to reconstruct old entry from diffs')
})
})
})
it('replaying history does not mutate the original obj', function () {
const initialState = { test: true, message: 'hello', value: 1 }
const diff1 = [{
"op": "replace",
"path": "/message",
"value": "haay",
}]
const diff2 = [{
"op": "replace",
"path": "/value",
"value": 2,
}]
const history = [initialState, diff1, diff2]
const beforeStateSnapshot = JSON.stringify(initialState)
const latestState = txStateHistoryHelper.replayHistory(history)
const afterStateSnapshot = JSON.stringify(initialState)
assert.notEqual(initialState, latestState, 'initial state is not the same obj as the latest state')
assert.equal(beforeStateSnapshot, afterStateSnapshot, 'initial state is not modified during run')
})
})
