Add unit test

src/storages/inLocalStorage/SplitsCacheInLocal.ts

@@ -71,8 +71,6 @@ export class SplitsCacheInLocal extends AbstractSplitsCacheSync {
    * We cannot simply call `localStorage.clear()` since that implies removing user items from the storage.
    */
   clear() {
-    this.log.info(LOG_PREFIX + 'Flushing Splits data from localStorage');
-
     // collect item keys
     const len = localStorage.length;
     const accum = [];

src/storages/inLocalStorage/__tests__/validateCache.spec.ts

@@ -0,0 +1,125 @@
+import { validateCache } from '../validateCache';
+
+import { KeyBuilderCS } from '../../KeyBuilderCS';
+import { fullSettings } from '../../../utils/settingsValidation/__tests__/settings.mocks';
+import { SplitsCacheInLocal } from '../SplitsCacheInLocal';
+import { nearlyEqual } from '../../../__tests__/testUtils';
+import { MySegmentsCacheInLocal } from '../MySegmentsCacheInLocal';
+
+const FULL_SETTINGS_HASH = '404832b3';
+
+describe('validateCache', () => {
+  const keys = new KeyBuilderCS('SPLITIO', 'user');
+  const logSpy = jest.spyOn(fullSettings.log, 'info');
+  const segments = new MySegmentsCacheInLocal(fullSettings.log, keys);
+  const largeSegments = new MySegmentsCacheInLocal(fullSettings.log, keys);
+  const splits = new SplitsCacheInLocal(fullSettings, keys);
+
+  jest.spyOn(splits, 'clear');
+  jest.spyOn(splits, 'getChangeNumber');
+  jest.spyOn(segments, 'clear');
+  jest.spyOn(largeSegments, 'clear');
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+    localStorage.clear();
+  });
+
+  test('if there is no cache, it should return false', () => {
+    expect(validateCache({}, fullSettings, keys, splits, segments, largeSegments)).toBe(false);
+
+    expect(logSpy).not.toHaveBeenCalled();
+
+    expect(splits.clear).not.toHaveBeenCalled();
+    expect(segments.clear).not.toHaveBeenCalled();
+    expect(largeSegments.clear).not.toHaveBeenCalled();
+    expect(splits.getChangeNumber).toHaveBeenCalledTimes(1);
+
+    expect(localStorage.getItem(keys.buildHashKey())).toBe(FULL_SETTINGS_HASH);
+    expect(localStorage.getItem(keys.buildLastClear())).toBeNull();
+  });
+
+  test('if there is cache and it must not be cleared, it should return true', () => {
+    localStorage.setItem(keys.buildSplitsTillKey(), '1');
+    localStorage.setItem(keys.buildHashKey(), FULL_SETTINGS_HASH);
+
+    expect(validateCache({}, fullSettings, keys, splits, segments, largeSegments)).toBe(true);
+
+    expect(logSpy).not.toHaveBeenCalled();
+
+    expect(splits.clear).not.toHaveBeenCalled();
+    expect(segments.clear).not.toHaveBeenCalled();
+    expect(largeSegments.clear).not.toHaveBeenCalled();
+    expect(splits.getChangeNumber).toHaveBeenCalledTimes(1);
+
+    expect(localStorage.getItem(keys.buildHashKey())).toBe(FULL_SETTINGS_HASH);
+    expect(localStorage.getItem(keys.buildLastClear())).toBeNull();
+  });
+
+  test('if there is cache and it has expired, it should clear cache and return false', () => {
+    localStorage.setItem(keys.buildSplitsTillKey(), '1');
+    localStorage.setItem(keys.buildHashKey(), FULL_SETTINGS_HASH);
+    localStorage.setItem(keys.buildLastUpdatedKey(), Date.now() - 1000 * 60 * 60 * 24 * 2 + ''); // 2 days ago
+
+    expect(validateCache({ expirationDays: 1 }, fullSettings, keys, splits, segments, largeSegments)).toBe(false);
+
+    expect(logSpy).toHaveBeenCalledWith('storage:localstorage: Cache expired more than 1 days ago. Cleaning up cache');
+
+    expect(splits.clear).toHaveBeenCalledTimes(1);
+    expect(segments.clear).toHaveBeenCalledTimes(1);
+    expect(largeSegments.clear).toHaveBeenCalledTimes(1);
+
+    expect(localStorage.getItem(keys.buildHashKey())).toBe(FULL_SETTINGS_HASH);
+    expect(nearlyEqual(parseInt(localStorage.getItem(keys.buildLastClear()) as string), Date.now())).toBe(true);
+  });
+
+  test('if there is cache and its hash has changed, it should clear cache and return false', () => {
+    localStorage.setItem(keys.buildSplitsTillKey(), '1');
+    localStorage.setItem(keys.buildHashKey(), FULL_SETTINGS_HASH);
+
+    expect(validateCache({}, { ...fullSettings, core: { ...fullSettings.core, authorizationKey: 'another' } }, keys, splits, segments, largeSegments)).toBe(false);
+
+    expect(logSpy).toHaveBeenCalledWith('storage:localstorage: SDK key, flags filter criteria or flags spec version has changed. Cleaning up cache');
+
+    expect(splits.clear).toHaveBeenCalledTimes(1);
+    expect(segments.clear).toHaveBeenCalledTimes(1);
+    expect(largeSegments.clear).toHaveBeenCalledTimes(1);
+
+    expect(localStorage.getItem(keys.buildHashKey())).toBe('aa4877c2');
+    expect(nearlyEqual(parseInt(localStorage.getItem(keys.buildLastClear()) as string), Date.now())).toBe(true);
+  });
+
+  test('if there is cache and clearOnInit is true, it should clear cache and return false', () => {
+    // Older cache version (without last clear)
+    localStorage.setItem(keys.buildSplitsTillKey(), '1');
+    localStorage.setItem(keys.buildHashKey(), FULL_SETTINGS_HASH);
+
+    expect(validateCache({ clearOnInit: true }, fullSettings, keys, splits, segments, largeSegments)).toBe(false);
+
+    expect(logSpy).toHaveBeenCalledWith('storage:localstorage: clearOnInit was set and cache was not cleared in the last 24 hours. Cleaning up cache');
+
+    expect(splits.clear).toHaveBeenCalledTimes(1);
+    expect(segments.clear).toHaveBeenCalledTimes(1);
+    expect(largeSegments.clear).toHaveBeenCalledTimes(1);
+
+    expect(localStorage.getItem(keys.buildHashKey())).toBe(FULL_SETTINGS_HASH);
+    const lastClear = localStorage.getItem(keys.buildLastClear());
+    expect(nearlyEqual(parseInt(lastClear as string), Date.now())).toBe(true);
+
+    // If cache is cleared, it should not clear again until a day has passed
+    logSpy.mockClear();
+    localStorage.setItem(keys.buildSplitsTillKey(), '1');
+    expect(validateCache({ clearOnInit: true }, fullSettings, keys, splits, segments, largeSegments)).toBe(true);
+    expect(logSpy).not.toHaveBeenCalled();
+    expect(localStorage.getItem(keys.buildLastClear())).toBe(lastClear); // Last clear should not have changed
+
+    // If a day has passed, it should clear again
+    localStorage.setItem(keys.buildLastClear(), (Date.now() - 1000 * 60 * 60 * 24 - 1) + '');
+    expect(validateCache({ clearOnInit: true }, fullSettings, keys, splits, segments, largeSegments)).toBe(false);
+    expect(logSpy).toHaveBeenCalledWith('storage:localstorage: clearOnInit was set and cache was not cleared in the last 24 hours. Cleaning up cache');
+    expect(splits.clear).toHaveBeenCalledTimes(2);
+    expect(segments.clear).toHaveBeenCalledTimes(2);
+    expect(largeSegments.clear).toHaveBeenCalledTimes(2);
+    expect(nearlyEqual(parseInt(localStorage.getItem(keys.buildLastClear()) as string), Date.now())).toBe(true);
+  });
+});