Markdown linting for e2e README (#2173)

* Markdown linting for e2e README

* Running a subset of tests

e2e/README.md

@@ -1,17 +1,24 @@
-### Contents:
+# e2e Testing
+
+## Contents
+
 1. [Prepare test environment](##-1.-Prepare-test-environment)
 2. [Prepare test data](##-2.-Prepare-test-data)
 3. [Running tests](##-3.-Running-tests)
 4. [FAQ](##-FAQ)
 
 ### 1. Prepare test environment
-##### 1.1. Set up local Rocket Chat server
+
+#### 1.1. Set up local Rocket Chat server
+
 * Install Rocket Chat meteor app by following this [guide](https://rocket.chat/docs/developer-guides/quick-start).
 
-##### 1.2. Set up detox
+#### 1.2. Set up detox
+
 * Install dependencies by following this [guide](https://github.com/wix/Detox/blob/master/docs/Introduction.GettingStarted.md#step-1-install-dependencies) (only Step 1).
 
 ### 2. Prepare test data
+
 * Run Rocket Chat meteor app: `meteor npm start` (make sure you to run this command from project that you created on Step 1.1.).
 * Open `localhost:3000` in browser.
 * Sign up as admin.
@@ -19,34 +26,45 @@
 * Create user with role: `user`, username: `detoxrn`, email: `YOUR@EMAIL.COM`, password: `123`.
 * Create user with role: `user`, username: `YOUR.NAME`, email: `YOUR.SECOND@EMAIL.COM`, password: `123`.
 * In file `e2e/data.js` change values `existingEmail` with `YOUR.SECOND@EMAIL.COM`, `existingName` with `YOUR.NAME`.
-* Login as user `detoxrn` -> open My Account -> Settings tab -> click Enable 2FA -> copy TTOLP code -> paste TTOLP code into `./e2e/data.js` file into field: `alternateUserTOTPSecret`.
+* Login as user `detoxrn` -> open My Account -> Security tab -> click "Enable two-factor authentication" -> copy TTOLP code -> paste TTOLP code into `./e2e/data.js` file into field: `alternateUserTOTPSecret`.
 
 ### 3. Running tests
+
 #### 3.1. iOS
+
 * Build app with detox: `detox build -c ios.sim.release`
 * Open Simulator which is used in tests (check in package.json under detox section) from Xcode and make sure that software keyboard is being displayed. To toggle keyboard press `cmd+K`.
 * Run tests: `detox test -c ios.sim.release`
 
-#### 3.1. Android
+#### 3.2. Android
+
 * Build app with detox: `detox build -c android.emu.debug`
 * Run: `react-native start`
 * Run Android emulator with name `ANDROID_API_28` via Android studio or `cd /Users/USERNAME/Library/Android/sdk/emulator/ && ./emulator -avd ANDROID_API_28`
 Note: if you need to run tests on different Android emulator then simply change emulator name in ./package.json detox configurations
 * Run tests: `detox test -c android.emu.debug`
 
+#### 3.3 Running a subset of tests
+
+Tests have been grouped into subfolders. You can choose to run just one group of tests by running, for example:
+
+`detox test ./e2e/tests/onboarding -c ios.sim.release`
+
 ### 4. FAQ
+
 #### 4.1. Detox build fails
-* Delete `node_modules`, `ios/build`, `android/build`: 
+
+* Delete `node_modules`, `ios/build`, `android/build`:
 `rm -rf node_modules && rm -rf ios/build && rm -rf android/build`
 * Install packages: `yarn install`
-* Kill metro bundler server by closing terminal or with following command: `lsof -ti:8081 | xargs kill` 
+* Kill metro bundler server by closing terminal or with following command: `lsof -ti:8081 | xargs kill`
 * Clear metro bundler cache: `watchman watch-del-all && rm -rf $TMPDIR/react-native-packager-cache-* &&  rm -rf $TMPDIR/metro-bundler-cache-*`
 * Make sure you have all required [environment](##-1.-Prepare-test-environment).
 * Now try building again with `detox build` (with specific configuration).
 
 #### 4.2. Detox iOS test run fails
+
 * Check if your meteor app is running by opening `localhost:3000` in browser.
 * Make sure software keyboard is displayed in simulator when focusing some input. To enable keyboard press `cmd+K`.
 * Make sure you have prepared all [test data](##-2.-Prepare-test-data).
 * Sometimes detox e2e tests fail for no reason so all you can do is simply re-run again.
-