Fix SplitsCacheInMemory::clear method, to clear flag sets cache

Author: EmilianoSanchez

src/storages/inMemory/SplitsCacheInMemory.ts

@@ -24,6 +24,7 @@ export class SplitsCacheInMemory extends AbstractSplitsCacheSync {
     this.ttCache = {};
     this.changeNumber = -1;
     this.segmentsCount = 0;
+    this.flagSetsCache = {};
   }
 
   addSplit(split: ISplit): boolean {

src/storages/inMemory/__tests__/SplitsCacheInMemory.spec.ts

@@ -161,6 +161,9 @@ test('SPLITS CACHE / In Memory / flag set cache tests', () => {
 
   cache.addSplit(featureFlagWithoutFS);
   expect(cache.getNamesByFlagSets([])).toEqual([]);
+
+  cache.clear();
+  expect(cache.getNamesByFlagSets(['o', 'e', 'x'])).toEqual([emptySet, emptySet, emptySet]);
 });
 
 // if FlagSets are not defined, it should store all FlagSets in memory.