add tests

app/reducers/server.test.ts

@@ -0,0 +1,26 @@
+import { selectServerRequest, selectServerSuccess } from '../actions/server';
+import { mockedStore } from './mockedStore';
+import { initialState } from './server';
+
+describe('test server reducer', () => {
+	it('should return initial state', () => {
+		const state = mockedStore.getState().server;
+		expect(state).toEqual(initialState);
+	});
+
+	it('should return modified store after selectServer', () => {
+		const server = 'https://open.rocket.chat/';
+		mockedStore.dispatch(selectServerRequest(server));
+		const state = mockedStore.getState().server.server;
+		expect(state).toEqual(server);
+	});
+
+	it('should return modified store after selectServerSucess', () => {
+		const serverStr = 'https://mobile.rocket.chat/';
+		const versionStr = '4.1.0';
+		mockedStore.dispatch(selectServerSuccess(serverStr, versionStr));
+		const { server, version } = mockedStore.getState().server;
+		expect(server).toEqual(serverStr);
+		expect(version).toEqual(versionStr);
+	});
+});

app/reducers/server.ts

@@ -12,7 +12,7 @@ export interface IServer {
 	changingServer: boolean;
 }
 
-const initialState: IServer = {
+export const initialState: IServer = {
 	connecting: false,
 	connected: false,
 	failure: false,