Run tests on either macOS 12 or macOS 13 (#5089)

In preparation for migrating our fleet to macOS 13, we're updating tests to run on either macOS 12 or macOS 13.

.ci.yaml

@@ -64,7 +64,7 @@ platform_properties:
         [
           {"dependency": "gems", "version": "v3.3.14"}
         ]
-      os: Mac-12
+      os: "Mac-12|Mac-13"
       device_type: none
       cpu: arm64
       $flutter/osx_sdk : >-
@@ -77,7 +77,7 @@ platform_properties:
         [
           {"dependency": "gems", "version": "v3.3.14"}
         ]
-      os: Mac-12
+      os: "Mac-12|Mac-13"
       device_type: none
       cpu: x86
       $flutter/osx_sdk : >-

.ci/scripts/boot_simulator.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+set -e
+
+# The name here must match create_simulator.sh
+readonly DEVICE_NAME=Flutter-iPhone
+
+# Allow boot to fail; cases like "Unable to boot device in current state: Booted"
+# exit with failure.
+xcrun simctl boot "$DEVICE_NAME" || :
+echo -e ""
+xcrun simctl list

.ci/scripts/create_simulator.sh

@@ -11,5 +11,18 @@ readonly DEVICE_NAME=Flutter-iPhone
 readonly DEVICE=com.apple.CoreSimulator.SimDeviceType.iPhone-14
 readonly OS=com.apple.CoreSimulator.SimRuntime.iOS-16-4
 
-xcrun simctl list
+# Delete any existing devices named Flutter-iPhone. Having more than one may
+# cause issues when builds target the device.
+echo -e "Deleting any existing devices names $DEVICE_NAME..."
+RESULT=0
+while [[ $RESULT == 0 ]]; do
+    xcrun simctl delete "$DEVICE_NAME" || RESULT=1
+    if [ $RESULT == 0 ]; then
+        echo -e "Deleted $DEVICE_NAME"
+    fi
+done
+echo -e ""
+
+echo -e "\nCreating $DEVICE_NAME $DEVICE $OS ...\n"
 xcrun simctl create "$DEVICE_NAME" "$DEVICE" "$OS" | xargs xcrun simctl boot
+xcrun simctl list

.ci/targets/ios_platform_tests.yaml

@@ -21,7 +21,12 @@ tasks:
     args: ["xcode-analyze", "--ios", "--ios-min-version=13.0"]
   - name: native test
     script: script/tool_runner.sh
-    args: ["native-test", "--ios", "--ios-destination", "platform=iOS Simulator,name=iPhone 14,OS=latest"]
+    # Simulator name must match name in create_simulator.sh
+    args: ["native-test", "--ios", "--ios-destination", "platform=iOS Simulator,name=Flutter-iPhone,OS=16.4"]
+  - name: boot simulator
+    # Ensure simulator is still booted
+    script: .ci/scripts/boot_simulator.sh
+    infra_step: true # Note infra steps failing prevents "always" from running.
   - name: drive examples
     # `drive-examples` contains integration tests, which changes the UI of the application.
     # This UI change sometimes affects `xctest`.

packages/pigeon/tool/shared/test_suites.dart

@@ -294,11 +294,54 @@ Future<int> _runIOSPluginUnitTests(String testPluginPath) async {
     return compileCode;
   }
 
+  const String deviceName = 'Pigeon-Test-iPhone';
+  const String deviceType = 'com.apple.CoreSimulator.SimDeviceType.iPhone-14';
+  const String deviceRuntime = 'com.apple.CoreSimulator.SimRuntime.iOS-16-4';
+  const String deviceOS = '16.4';
+  await _createSimulator(deviceName, deviceType, deviceRuntime);
   return runXcodeBuild(
     '$examplePath/ios',
     sdk: 'iphonesimulator',
-    destination: 'platform=iOS Simulator,name=iPhone 14',
+    destination: 'platform=iOS Simulator,name=$deviceName,OS=$deviceOS',
     extraArguments: <String>['test'],
+  ).whenComplete(() => _deleteSimulator(deviceName));
+}
+
+Future<int> _createSimulator(
+  String deviceName,
+  String deviceType,
+  String deviceRuntime,
+) async {
+  // Delete any existing simulators with the same name until it fails. It will
+  // fail once there are no simulators with the name. Having more than one may
+  // cause issues when builds target the device.
+  int deleteResult = 0;
+  while (deleteResult == 0) {
+    deleteResult = await _deleteSimulator(deviceName);
+  }
+  return runProcess(
+    'xcrun',
+    <String>[
+      'simctl',
+      'create',
+      deviceName,
+      deviceType,
+      deviceRuntime,
+    ],
+    streamOutput: false,
+    logFailure: true,
+  );
+}
+
+Future<int> _deleteSimulator(String deviceName) async {
+  return runProcess(
+    'xcrun',
+    <String>[
+      'simctl',
+      'delete',
+      deviceName,
+    ],
+    streamOutput: false,
   );
 }