adding unit test for focus module

app/sdk/__tests__/focus.tests.ts

@@ -0,0 +1,27 @@
+import { FocusModule } from '../src/focus';
+import { NoStore } from '../src/store';
+import { ConsoleLogging } from '../src/logging';
+import { waitFor } from '../__mocks__/waitFor';
+
+jest.mock('../src/net/fetchUtil', () => {
+  const fn = jest.fn().mockImplementation((url: string, options: { method: string, body: string }) => {
+  });
+
+  return {
+    fetchWithTimeout: fn,
+    checkResponse: () => {},
+  }
+});
+  
+class TestStore extends NoStore {
+}
+
+test('focus module works', async () => {
+  const log = new ConsoleLogging();
+  const store = new TestStore();
+  const connection = { node: 'test_node', secure: false, token: 'test_token' };
+  const markRead = async () => {};
+  const flagTopic = async (id: string) => {};
+  const focus = new FocusModule(log, store, null, null, null, 'test_channel_id', 'my_guid', connection, null, false, 1, markRead, flagTopic);
+  await focus.close();
+});