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Diffstat (limited to 'test/unit/tx-state-history-helper.js')
-rw-r--r-- | test/unit/tx-state-history-helper.js | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/test/unit/tx-state-history-helper.js b/test/unit/tx-state-history-helper.js new file mode 100644 index 000000000..79ee26d6e --- /dev/null +++ b/test/unit/tx-state-history-helper.js @@ -0,0 +1,46 @@ +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') + }) + +}) |