129 lines
3.7 KiB
JavaScript
129 lines
3.7 KiB
JavaScript
import AjaxCache from '~/lib/utils/ajax_cache';
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describe('AjaxCache', () => {
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const dummyEndpoint = '/AjaxCache/dummyEndpoint';
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const dummyResponse = {
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important: 'dummy data',
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};
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let ajaxSpy = (url) => {
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expect(url).toBe(dummyEndpoint);
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const deferred = $.Deferred();
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deferred.resolve(dummyResponse);
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return deferred.promise();
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};
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beforeEach(() => {
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AjaxCache.internalStorage = { };
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spyOn(jQuery, 'ajax').and.callFake(url => ajaxSpy(url));
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});
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describe('#get', () => {
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it('returns undefined if cache is empty', () => {
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const data = AjaxCache.get(dummyEndpoint);
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expect(data).toBe(undefined);
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});
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it('returns undefined if cache contains no matching data', () => {
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AjaxCache.internalStorage['not matching'] = dummyResponse;
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const data = AjaxCache.get(dummyEndpoint);
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expect(data).toBe(undefined);
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});
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it('returns matching data', () => {
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AjaxCache.internalStorage[dummyEndpoint] = dummyResponse;
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const data = AjaxCache.get(dummyEndpoint);
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expect(data).toBe(dummyResponse);
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});
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});
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describe('#hasData', () => {
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it('returns false if cache is empty', () => {
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expect(AjaxCache.hasData(dummyEndpoint)).toBe(false);
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});
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it('returns false if cache contains no matching data', () => {
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AjaxCache.internalStorage['not matching'] = dummyResponse;
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expect(AjaxCache.hasData(dummyEndpoint)).toBe(false);
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});
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it('returns true if data is available', () => {
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AjaxCache.internalStorage[dummyEndpoint] = dummyResponse;
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expect(AjaxCache.hasData(dummyEndpoint)).toBe(true);
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});
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});
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describe('#purge', () => {
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it('does nothing if cache is empty', () => {
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AjaxCache.purge(dummyEndpoint);
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expect(AjaxCache.internalStorage).toEqual({ });
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});
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it('does nothing if cache contains no matching data', () => {
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AjaxCache.internalStorage['not matching'] = dummyResponse;
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AjaxCache.purge(dummyEndpoint);
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expect(AjaxCache.internalStorage['not matching']).toBe(dummyResponse);
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});
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it('removes matching data', () => {
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AjaxCache.internalStorage[dummyEndpoint] = dummyResponse;
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AjaxCache.purge(dummyEndpoint);
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expect(AjaxCache.internalStorage).toEqual({ });
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});
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});
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describe('#retrieve', () => {
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it('stores and returns data from Ajax call if cache is empty', (done) => {
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AjaxCache.retrieve(dummyEndpoint)
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.then((data) => {
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expect(data).toBe(dummyResponse);
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expect(AjaxCache.internalStorage[dummyEndpoint]).toBe(dummyResponse);
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})
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.then(done)
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.catch(fail);
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});
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it('returns undefined if Ajax call fails and cache is empty', (done) => {
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const dummyStatusText = 'exploded';
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const dummyErrorMessage = 'server exploded';
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ajaxSpy = (url) => {
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expect(url).toBe(dummyEndpoint);
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const deferred = $.Deferred();
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deferred.reject(null, dummyStatusText, dummyErrorMessage);
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return deferred.promise();
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};
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AjaxCache.retrieve(dummyEndpoint)
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.then(data => fail(`Received unexpected data: ${JSON.stringify(data)}`))
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.catch((error) => {
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expect(error.message).toBe(`${dummyEndpoint}: ${dummyErrorMessage}`);
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expect(error.textStatus).toBe(dummyStatusText);
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done();
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})
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.catch(fail);
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});
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it('makes no Ajax call if matching data exists', (done) => {
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AjaxCache.internalStorage[dummyEndpoint] = dummyResponse;
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ajaxSpy = () => fail(new Error('expected no Ajax call!'));
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AjaxCache.retrieve(dummyEndpoint)
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.then((data) => {
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expect(data).toBe(dummyResponse);
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})
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.then(done)
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.catch(fail);
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});
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});
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});
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