Convert old tests to use "react-testing-library"

app/soapbox/actions/__tests__/about-test.js

@@ -2,7 +2,7 @@ import MockAdapter from 'axios-mock-adapter';
 import { Map as ImmutableMap } from 'immutable';
 
 import { staticClient } from 'soapbox/api';
-import { mockStore } from 'soapbox/test_helpers';
+import { mockStore } from 'soapbox/jest/test-helpers';
 
 import {
   FETCH_ABOUT_PAGE_REQUEST,

app/soapbox/actions/__tests__/compose.test.js

@@ -1,6 +1,6 @@
+import { mockStore } from 'soapbox/jest/test-helpers';
 import { InstanceRecord } from 'soapbox/normalizers';
 import rootReducer from 'soapbox/reducers';
-import { mockStore } from 'soapbox/test_helpers';
 
 import { uploadCompose } from '../compose';
 

app/soapbox/actions/__tests__/preload-test.js

@@ -1,7 +1,7 @@
 import { Map as ImmutableMap } from 'immutable';
 
 import { __stub } from 'soapbox/api';
-import { mockStore } from 'soapbox/test_helpers';
+import { mockStore } from 'soapbox/jest/test-helpers';
 
 import { VERIFY_CREDENTIALS_REQUEST } from '../auth';
 import { ACCOUNTS_IMPORT } from '../importer';

app/soapbox/actions/__tests__/statuses-test.js

@@ -1,6 +1,6 @@
 import { STATUSES_IMPORT } from 'soapbox/actions/importer';
 import { __stub } from 'soapbox/api';
-import { mockStore, rootState } from 'soapbox/test_helpers';
+import { mockStore, rootState } from 'soapbox/jest/test-helpers';
 
 import { fetchContext } from '../statuses';