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react-native-firebase/tests/README.md

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# React Native Firebase - Testing Project
Our tests are powered by [Jet ✈️](https://github.com/invertase/jet).
> **Note**: instructions in this file assume you're running terminal commands from the root of the project and not from inside the tests directory.
## Requirements
- Make sure you have Xcode installed (tested with Xcode 9.2+).
- Make sure you have NodeJS installed (Node 8.4.0 and up is required).
- Make sure you have all required dependencies installed:
- [Apple Sim Utils](https://github.com/wix/AppleSimulatorUtils):
```bash
brew tap wix/brew
brew install wix/brew/applesimutils
```
---
### Step 1: Install test project dependencies
Yarn install at project root and also inside tests directory.
Also install tests project iOS Pods.
```bash
yarn
cd tests/ && yarn
cd tests/ios && pod install --repo-update
```
---
### Step 2: Start Packager Script
Start the React Native packager using the script provided;
```bash
cd tests/ && yarn run packager-jet
```
> ⚠️ It must be this script only that starts the RN Packager, using the default RN packager command will not work.
> ⚠️ Also ensure that all existing packagers are terminated and that you have no React Native debugger tabs open on your browsers.
> This packager will automatically rebuild on any JS changes to the library code. You don't need to restart this, leave it running whilst developing.
---
### Step 3: Build Native App
As always; the first build for each platform will take a while. Subsequent builds are much much quicker ⚡️
> ⚠️ You must rebuild native every time you make changes to native code (anything in /android /ios directories).
#### Android
```bash
cd tests/ && yarn run build-android
```
#### iOS
```bash
cd tests/ && yarn run build-ios
```
---
### Step 4: Finally, run the tests
This action will launch a new simulator (if not already open) and run the tests on it.
> 💡 iOS by default will background launch the simulator - to have
> it launch in the foreground make sure any simulator is currently open, `Finder -> Simulator.app`.
> 💡 Android by default looks for a pre-defined emulator named `TestingAVD` - make sure you have one named the same setup on Android Studio.
> Or you can change this name in the `package.json` of the tests project (don't commit the change though please).
> **DO NOT** rename an existing AVD to this name - it will not work, rename does not change the file path currently so Detox will
> fail to find the AVD in the correct directory. Create a new one with Google Play Services.
#### Android
```bash
cd tests/ && yarn run test-android
```
#### iOS
```bash
cd tests/ && yarn run test-ios
```
The `test-${platform}` commands uninstall any existing app and installs a fresh copy. You can
run `test-${platform}-reuse` instead if you don't need to re-install the app (i.e only making JS code changes).
Just remember to use `test-${platform}` if you made native code changes and rebuilt - after installing once you can
go back to using the `reuse` variant.
The `cover` variant of the yarn scripts will additionally run tests with coverage.
Coverage is output to the root directory of the project: `react-native-firebase/coverage`,
open `react-native-firebase/coverage/lcov-report/index.html` in your browser after running tests
to view detailed coverage output.
---
### Running specific tests
Mocha supports the `.only` syntax, e.g. instead of `describe(...) || it(...)` you can use `describe.only(...) || it.only(...)` to only run that specific context or test.
Another way to do this is via adding a `--grep` option to e2e/mocha.opts file, e.g. `--grep auth` for all tests that have auth in the file path or tests descriptions.
> 💡 Don't forget to remove these before committing your code and submitting a pull request
For more Mocha options see https://mochajs.org/#usage