[pigeon] Convert test plugins to SPM (#9105)

Updates the test harness plugins to support SPM, so that tests won't rely on CocoaPods going forward.

For now I've left CocoaPods support in the plugins and the integration in the example app, so that local tests won't rely on SPM support being on, but in the future when needing to disable it locally for testing plugins is rare we can fully remove CocoaPods from the test plugins and their apps since they aren't public plugins and thus don't need to support both modes once we don't use both ourselves.

Part of flutter/flutter#146922

## Pre-Review Checklist

[^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.

Author: stuartmorgan-g

packages/pigeon/platform_tests/alternate_language_test_plugin/darwin/alternate_language_test_plugin.podspec

@@ -13,8 +13,8 @@ A plugin to test Pigeon generation for secondary languages (e.g., Java, Objectiv
   s.license          = { :type => 'BSD', :file => '../../../LICENSE' }
   s.author           = { 'Your Company' => '[email protected]' }
   s.source           = { :http => 'https://github.com/flutter/packages/tree/main/packages/pigeon' }
-  s.source_files = 'Classes/**/*'
-  s.public_header_files = 'Classes/**/*.h'
+  s.source_files = 'alternate_language_test_plugin/Sources/alternate_language_test_plugin/**/*.{h,m}'
+  s.public_header_files = 'alternate_language_test_plugin/Sources/alternate_language_test_plugin/include/**/*.h'
   s.ios.dependency 'Flutter'
   s.osx.dependency 'FlutterMacOS'
   s.ios.deployment_target = '12.0'

packages/pigeon/platform_tests/alternate_language_test_plugin/darwin/alternate_language_test_plugin/Package.swift

@@ -0,0 +1,30 @@
+// swift-tools-version: 5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+// 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.
+
+import PackageDescription
+
+let package = Package(
+  name: "alternate_language_test_plugin",
+  platforms: [
+    .iOS("12.0"),
+    .macOS("10.14"),
+  ],
+  products: [
+    .library(name: "alternate-language-test-plugin", targets: ["alternate_language_test_plugin"])
+  ],
+  dependencies: [],
+  targets: [
+    .target(
+      name: "alternate_language_test_plugin",
+      dependencies: [],
+      resources: [],
+      cSettings: [
+        .headerSearchPath("include/alternate_language_test_plugin")
+      ]
+    )
+  ]
+)

packages/pigeon/platform_tests/alternate_language_test_plugin/darwin/Classes/.gitignore renamed to packages/pigeon/platform_tests/alternate_language_test_plugin/darwin/alternate_language_test_plugin/Sources/alternate_language_test_plugin/.gitignore

@@ -5,7 +5,7 @@
 // Autogenerated from Pigeon, do not edit directly.
 // See also: https://pub.dev/packages/pigeon
 
-#import "CoreTests.gen.h"
+#import "./include/alternate_language_test_plugin/CoreTests.gen.h"
 
 #if TARGET_OS_OSX
 #import <FlutterMacOS/FlutterMacOS.h>

packages/pigeon/platform_tests/alternate_language_test_plugin/darwin/Classes/AlternateLanguageTestPlugin.m renamed to packages/pigeon/platform_tests/alternate_language_test_plugin/darwin/alternate_language_test_plugin/Sources/alternate_language_test_plugin/AlternateLanguageTestPlugin.m

@@ -5,9 +5,11 @@
 *.swp
 .DS_Store
 .atom/
+.build/
 .buildlog/
 .history
 .svn/
+.swiftpm/
 migrate_working_dir/
 
 # IntelliJ related

packages/pigeon/platform_tests/alternate_language_test_plugin/darwin/Classes/CoreTests.gen.m renamed to packages/pigeon/platform_tests/alternate_language_test_plugin/darwin/alternate_language_test_plugin/Sources/alternate_language_test_plugin/CoreTests.gen.m

@@ -29,6 +29,7 @@
 		97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FD1CF9000F007C117D /* Assets.xcassets */; };
 		97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */; };
 		EB2133B34553CD36D4AE374F /* libPods-Runner.a in Frameworks */ = {isa = PBXBuildFile; fileRef = F87F49FAD891F66A75D95E85 /* libPods-Runner.a */; };
+		78A318202AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage in Frameworks */ = {isa = PBXBuildFile; productRef = 78A3181F2AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -109,6 +110,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				78A318202AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage in Frameworks */,
 				EB2133B34553CD36D4AE374F /* libPods-Runner.a in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -240,6 +242,9 @@
 			productType = "com.apple.product-type.bundle.unit-test";
 		};
 		97C146ED1CF9000F007C117D /* Runner */ = {
+			packageProductDependencies = (
+				78A3181F2AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage */,
+			);
 			isa = PBXNativeTarget;
 			buildConfigurationList = 97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */;
 			buildPhases = (
@@ -264,6 +269,9 @@
 
 /* Begin PBXProject section */
 		97C146E61CF9000F007C117D /* Project object */ = {
+			packageReferences = (
+				781AD8BC2B33823900A9FFBB /* XCLocalSwiftPackageReference "Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage" */,
+			);
 			isa = PBXProject;
 			attributes = {
 				LastUpgradeCheck = 1510;
@@ -745,6 +753,18 @@
 			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
+/* Begin XCLocalSwiftPackageReference section */
+		781AD8BC2B33823900A9FFBB /* XCLocalSwiftPackageReference "Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage" */ = {
+			isa = XCLocalSwiftPackageReference;
+			relativePath = Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage;
+		};
+/* End XCLocalSwiftPackageReference section */
+/* Begin XCSwiftPackageProductDependency section */
+		78A3181F2AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = FlutterGeneratedPluginSwiftPackage;
+		};
+/* End XCSwiftPackageProductDependency section */
 	};
 	rootObject = 97C146E61CF9000F007C117D /* Project object */;
 }

packages/pigeon/platform_tests/alternate_language_test_plugin/darwin/Classes/AlternateLanguageTestPlugin.h renamed to packages/pigeon/platform_tests/alternate_language_test_plugin/darwin/alternate_language_test_plugin/Sources/alternate_language_test_plugin/include/alternate_language_test_plugin/AlternateLanguageTestPlugin.h

@@ -5,6 +5,24 @@
    <BuildAction
       parallelizeBuildables = "YES"
       buildImplicitDependencies = "YES">
+      <PreActions>
+         <ExecutionAction
+            ActionType = "Xcode.IDEStandardExecutionActionsCore.ExecutionActionType.ShellScriptAction">
+            <ActionContent
+               title = "Run Prepare Flutter Framework Script"
+               scriptText = "/bin/sh &quot;$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh&quot; prepare&#10;">
+               <EnvironmentBuildable>
+                  <BuildableReference
+                     BuildableIdentifier = "primary"
+                     BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+                     BuildableName = "Runner.app"
+                     BlueprintName = "Runner"
+                     ReferencedContainer = "container:Runner.xcodeproj">
+                  </BuildableReference>
+               </EnvironmentBuildable>
+            </ActionContent>
+         </ExecutionAction>
+      </PreActions>
       <BuildActionEntries>
          <BuildActionEntry
             buildForTesting = "YES"
@@ -26,6 +44,7 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      customLLDBInitFile = "$(SRCROOT)/Flutter/ephemeral/flutter_lldbinit"
       shouldUseLaunchSchemeArgsEnv = "YES">
       <MacroExpansion>
          <BuildableReference
@@ -54,11 +73,13 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      customLLDBInitFile = "$(SRCROOT)/Flutter/ephemeral/flutter_lldbinit"
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
       debugDocumentVersioning = "YES"
       debugServiceExtension = "internal"
+      enableGPUValidationMode = "1"
       allowLocationSimulation = "YES">
       <BuildableProductRunnable
          runnableDebuggingMode = "0">