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[docs] Update Testing.md #31866

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Expand Up @@ -24,6 +24,24 @@ We use multiple approaches to test the Swift toolchain.
locally before committing. (Usually on a single platform, and not necessarily
all tests.)
* Buildbots run all tests, on all supported platforms.
[Smoke testing](ContinuousIntegration.md#smoke-testing)
skips the iOS, tvOS, and watchOS platforms.

The [test/lit.cfg](https://github.com/apple/swift/blob/master/test/lit.cfg)
uses an iOS 10.3 simulator configuration named "iPhone 5" for 32-bit testing.

1. Download and install the iOS 10.3 simulator runtime, in Xcode's
[Components](https://help.apple.com/xcode/#/deva7379ae35) preferences.

2. Create an "iPhone 5" simulator configuration, either in Xcode's
[Devices and Simulators](https://help.apple.com/xcode/#/devf225e58da)
window, or with the command line:

```sh
xcrun simctl create 'iPhone 5' 'com.apple.CoreSimulator.SimDeviceType.iPhone-5'
```

3. Append `--ios` to the `utils/build-script` command line (see below).

### Testsuite subsets

Expand Down