Add tests for expandFollowers() action

app/soapbox/actions/__tests__/accounts.test.ts

@@ -8,6 +8,7 @@ import { normalizeAccount } from '../../normalizers';
 import {
   blockAccount,
   createAccount,
+  expandFollowers,
   fetchAccount,
   fetchAccountByUsername,
   fetchFollowers,
@@ -1045,4 +1046,91 @@ describe('fetchFollowers()', () => {
       });
     });
   });
-});
+});
+
+describe('expandFollowers()', () => {
+  const id = '1';
+
+  describe('when logged in', () => {
+    beforeEach(() => {
+      const state = rootReducer(undefined, {})
+        .set('user_lists', ImmutableMap({
+          followers: ImmutableMap({
+            [id]: ImmutableMap({
+              next: 'next_url',
+            }),
+          }),
+        }))
+        .set('me', '123');
+      store = mockStore(state);
+    });
+
+    describe('when the url is null', () => {
+      beforeEach(() => {
+        const state = rootReducer(undefined, {})
+          .set('user_lists', ImmutableMap({
+            followers: ImmutableMap({
+              [id]: ImmutableMap({
+                next: null,
+              }),
+            }),
+          }))
+          .set('me', '123');
+        store = mockStore(state);
+      });
+
+      it('should do nothing', async() => {
+        await store.dispatch(expandFollowers(id));
+        const actions = store.getActions();
+
+        expect(actions).toEqual([]);
+      });
+    });
+
+    describe('with a successful API request', () => {
+      beforeEach(() => {
+        __stub((mock) => {
+          mock.onGet('next_url').reply(200, [], {
+            link: `<https://example.com/api/v1/accounts/${id}/followers?since_id=1>; rel='prev'`,
+          });
+        });
+      });
+
+      it('should dispatch the correct actions', async() => {
+        const expectedActions = [
+          { type: 'FOLLOWERS_EXPAND_REQUEST', id },
+          { type: 'ACCOUNTS_IMPORT', accounts: [] },
+          {
+            type: 'FOLLOWERS_EXPAND_SUCCESS',
+            id,
+            accounts: [],
+            next: null,
+          },
+        ];
+        await store.dispatch(expandFollowers(id));
+        const actions = store.getActions();
+
+        expect(actions).toEqual(expectedActions);
+      });
+    });
+
+    describe('with an unsuccessful API request', () => {
+      beforeEach(() => {
+        __stub((mock) => {
+          mock.onGet('next_url').networkError();
+        });
+      });
+
+      it('should dispatch the correct actions', async() => {
+        const expectedActions = [
+          { type: 'FOLLOWERS_EXPAND_REQUEST', id },
+          { type: 'FOLLOWERS_EXPAND_FAIL', id, error: new Error('Network Error') },
+        ];
+        await store.dispatch(expandFollowers(id));
+        const actions = store.getActions();
+
+        expect(actions).toEqual(expectedActions);
+      });
+    });
+  });
+});

app/soapbox/actions/accounts.ts

@@ -532,25 +532,28 @@ const fetchFollowersFail = (id: string, error: AxiosError) => ({
 
 const expandFollowers = (id: string) =>
   (dispatch: AppDispatch, getState: () => RootState) => {
-    if (!isLoggedIn(getState)) return;
+    if (!isLoggedIn(getState)) return null;
 
     const url = getState().user_lists.getIn(['followers', id, 'next']);
 
     if (url === null) {
-      return;
+      return null;
     }
 
     dispatch(expandFollowersRequest(id));
 
-    api(getState).get(url).then(response => {
-      const next = getLinks(response).refs.find(link => link.rel === 'next');
+    return api(getState)
+      .get(url)
+      .then(response => {
+        const next = getLinks(response).refs.find(link => link.rel === 'next');
 
-      dispatch(importFetchedAccounts(response.data));
-      dispatch(expandFollowersSuccess(id, response.data, next ? next.uri : null));
-      dispatch(fetchRelationships(response.data.map((item: APIEntity) => item.id)));
-    }).catch(error => {
-      dispatch(expandFollowersFail(id, error));
-    });
+        dispatch(importFetchedAccounts(response.data));
+        dispatch(expandFollowersSuccess(id, response.data, next ? next.uri : null));
+        dispatch(fetchRelationships(response.data.map((item: APIEntity) => item.id)));
+      })
+      .catch(error => {
+        dispatch(expandFollowersFail(id, error));
+      });
   };
 
 const expandFollowersRequest = (id: string) => ({