test(core): Multi-isolate spike evidence for Amplify configure (#5302) - #7266
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…5302) Spike for #5302. Test-only; no production code touched. - amplify_core: a spawned isolate inherits no Amplify state and completes `configure()` on its own, without disturbing the parent. The per-instance `AmplifyAlreadyConfiguredException` guard is unchanged. - amplify_flutter: a bare `Isolate.spawn`ed isolate has no `BinaryMessenger`, so platform channel calls throw; passing `RootIsolateToken` to `BackgroundIsolateBinaryMessenger.ensureInitialized` installs one. - amplify_datastore example: proves the native SDK is a process-wide singleton, so a spawned isolate with fresh Dart state still hits an already-configured native Amplify. Registered in `main_test.dart` so it runs on the existing e2e_android legs; gated to Android, skipped on e2e_ios. - amplify_secure_storage example: the native Pigeon round trip from a background isolate. Left device-gated and out of CI -- that example has web and wasm legs, and `dart:io`/`dart:isolate` do not compile for web. Carries a testing plan in its header.
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configure()on its own, without disturbing the parent. The per-instanceAmplifyAlreadyConfiguredExceptionguard is unchanged. →packages/amplify_core/test/amplify_class_isolate_test.dartIsolate.spawned isolate has noBinaryMessenger, so platform-channel calls throw;RootIsolateToken+BackgroundIsolateBinaryMessenger.ensureInitializedinstalls one (the binding still does not exist). →packages/amplify/amplify_flutter/test/isolate_binary_messenger_test.dart(first tests in this package, soflutter testnow runs there)AmplifyAlreadyConfiguredExceptionback from Kotlin (dartStateWasEmpty: true+errorCode: AmplifyAlreadyConfiguredExceptionin one run). Runs and passes on the existinge2e_androidlegs (API 24 + 35), skipped one2e_ios. →packages/amplify_datastore/example/integration_test/isolate_native_singleton_test.dart. The secure-storage Pigeon harness stays device-gated with a testing plan (that example has web/wasm legs;dart:io/dart:isolatedo not compile for web).