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metamask-extension/ui/app/helpers/utils/fetch-with-cache.test.js

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import assert from 'assert'
import nock from 'nock'
import sinon from 'sinon'
import proxyquire from 'proxyquire'
const fakeLocalStorageHelpers = {}
const fetchWithCache = proxyquire('./fetch-with-cache', {
'../../../lib/local-storage-helpers': fakeLocalStorageHelpers,
}).default
describe('Fetch with cache', function () {
beforeEach(function () {
fakeLocalStorageHelpers.loadLocalStorageData = sinon.stub()
fakeLocalStorageHelpers.saveLocalStorageData = sinon.stub()
})
afterEach(function () {
sinon.restore()
nock.cleanAll()
})
it('fetches a url', async function () {
nock('https://fetchwithcache.metamask.io')
.get('/price')
.reply(200, '{"average": 1}')
const response = await fetchWithCache('https://fetchwithcache.metamask.io/price')
assert.deepEqual(response, {
average: 1,
})
})
it('returns cached response', async function () {
nock('https://fetchwithcache.metamask.io')
.get('/price')
.reply(200, '{"average": 2}')
fakeLocalStorageHelpers.loadLocalStorageData.returns({
'https://fetchwithcache.metamask.io/price': {
cachedResponse: { average: 1 },
cachedTime: Date.now(),
},
})
const response = await fetchWithCache('https://fetchwithcache.metamask.io/price')
assert.deepEqual(response, {
average: 1,
})
})
it('fetches URL again after cache refresh time has passed', async function () {
nock('https://fetchwithcache.metamask.io')
.get('/price')
.reply(200, '{"average": 3}')
fakeLocalStorageHelpers.loadLocalStorageData.returns({
'https://fetchwithcache.metamask.io/cached': {
cachedResponse: { average: 1 },
cachedTime: Date.now() - 1000,
},
})
const response = await fetchWithCache('https://fetchwithcache.metamask.io/price', {}, { cacheRefreshTime: 123 })
assert.deepEqual(response, {
average: 3,
})
})
it('should abort the request when the custom timeout is hit', async function () {
nock('https://fetchwithcache.metamask.io')
.get('/price')
.delay(100)
.reply(200, '{"average": 4}')
await assert.rejects(
() => fetchWithCache('https://fetchwithcache.metamask.io/price', {}, { timeout: 20 }),
{ name: 'AbortError', message: 'Aborted' },
)
})
it('throws when the response is unsuccessful', async function () {
nock('https://fetchwithcache.metamask.io')
.get('/price')
.reply(500, '{"average": 6}')
await assert.rejects(
() => fetchWithCache('https://fetchwithcache.metamask.io/price'),
)
})
it('throws when a POST request is attempted', async function () {
nock('https://fetchwithcache.metamask.io')
.post('/price')
.reply(200, '{"average": 7}')
await assert.rejects(
() => fetchWithCache('https://fetchwithcache.metamask.io/price', { method: 'POST' }),
)
})
it('throws when the request has a truthy body', async function () {
nock('https://fetchwithcache.metamask.io')
.get('/price')
.reply(200, '{"average": 8}')
await assert.rejects(
() => fetchWithCache('https://fetchwithcache.metamask.io/price', { body: 1 }),
)
})
it('throws when the request has an invalid Content-Type header', async function () {
nock('https://fetchwithcache.metamask.io')
.get('/price')
.reply(200, '{"average": 9}')
await assert.rejects(
() => fetchWithCache('https://fetchwithcache.metamask.io/price', { headers: { 'Content-Type': 'text/plain' } }),
{ message: 'fetchWithCache only supports JSON responses' },
)
})
})