Add test case to cover the case when the identities/ API cannot be reached

Author: gnapse

test/init.test.ts

@@ -1,6 +1,6 @@
 // Sample test
 import { waitFor } from '@testing-library/react';
-import { defaultState, environmentID, getFlagsmith, getStateToCheck, identityState } from './test-constants';
+import { defaultState, getFlagsmith, getStateToCheck, identityState } from './test-constants';
 import { promises as fs } from 'fs';
 
 describe('Flagsmith.init', () => {
@@ -213,8 +213,8 @@ describe('Flagsmith.init', () => {
 
         await waitFor(() => {
             expect(onError).toHaveBeenCalledTimes(1);
-            expect(onError).toHaveBeenCalledWith(new Error('Mocked fetch error'));
         });
+        expect(onError).toHaveBeenCalledWith(new Error('Mocked fetch error'));
     });
     test('should not reject when the API cannot be reached but default flags are set', async () => {
         const { flagsmith, initConfig } = getFlagsmith({
@@ -228,4 +228,24 @@ describe('Flagsmith.init', () => {
 
         expect(getStateToCheck(flagsmith.getState())).toEqual(defaultState);
     });
+    test('should not reject but call onError, when the identities/ API cannot be reached with the cache populated', async () => {
+        const onError = jest.fn();
+        const { flagsmith, initConfig, AsyncStorage } = getFlagsmith({
+            evaluationContext: identityState.evaluationContext,
+            cacheFlags: true,
+            fetch: async () => {
+                return Promise.resolve({ text: () => Promise.resolve('Mocked fetch error'), ok: false, status: 401 });
+            },
+            onError,
+        });
+        await AsyncStorage.setItem('BULLET_TRAIN_DB', JSON.stringify(identityState));
+        await flagsmith.init(initConfig);
+
+        expect(getStateToCheck(flagsmith.getState())).toEqual(identityState);
+
+        await waitFor(() => {
+            expect(onError).toHaveBeenCalledTimes(1);
+        });
+        expect(onError).toHaveBeenCalledWith(new Error('Mocked fetch error'));
+    });
 });