Add serializer conformance tests and baselines

[ReubenBond]

This PR add snapshot-based testing for the serializer to help ensure we don't break things as we make changes to the serializer or source generator infrastructure.

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Pull request overview

Adds snapshot-based conformance coverage for Orleans’ generated serializer, providing both byte-level baselines and human-readable formatted snapshots to detect wire-format drift as serializer/source-generator behavior evolves.

Changes:

• Introduce GeneratedSerializerBitwiseCompatibilityTests which asserts bitwise-stable payloads against checked-in hex baselines and (where supported) Verify-based formatted snapshots.
• Add Verify.Xunit dependency for non-netcoreapp3.1 TFMs to support snapshot verification.
• Check in baseline (*.verified.hex.txt) and formatted (*.verified.txt) snapshot artifacts for the new test suite.

Show a summary per file

File	Description
test/Orleans.Serialization.UnitTests/GeneratedSerializerBitwiseCompatibilityTests.cs	New bitwise compatibility + formatted snapshot tests for generated serializer payloads.
test/Orleans.Serialization.UnitTests/Orleans.Serialization.UnitTests.csproj	Adds Verify.Xunit for non-netcoreapp3.1 targets.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.WrapsMyForeignLibraryType_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for WrapsMyForeignLibraryType exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.WrapsMyForeignLibraryType_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for WrapsMyForeignLibraryType exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.SubClassWithRequiredMembersInBase_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for subclass required-members-in-base scenario.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.SerializableClassWithCompiledBase_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for compiled-base-class scenario.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.ReadonlyGenericPersonExternalStruct_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for readonly generic external struct scenario.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.Person5_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for Person5 exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.Person5_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for Person5 exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.Person4_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for Person4 exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.Person3_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for Person3 exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.Person3_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for Person3 exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.Person2External_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for external Person2 exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.Person2External_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for external Person2 exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.Person2ExternalStruct_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for external Person2 struct exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.OuterInnerNonGen_Untyped_MatchesBaseline.verified.hex.txt	Hex baseline for untyped outer/inner non-generic case.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.OuterInnerGen_Untyped_MatchesBaseline.verified.hex.txt	Hex baseline for untyped outer/inner generic case.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.NestedGenericPoco_Untyped_MatchesBaseline.verified.hex.txt	Hex baseline for nested generic POCO untyped serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.NestedGenericPoco_Untyped_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for nested generic POCO untyped serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.MySecondForeignLibraryType_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for second foreign-library type exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.MySecondForeignLibraryType_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for second foreign-library type exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.MyFirstForeignLibraryType_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for first foreign-library type exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.MyFirstForeignLibraryType_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for first foreign-library type exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.ImmutableStruct_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for immutable struct exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.ImmutableClass_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for immutable class exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GenericPocoString_Untyped_MatchesBaseline.verified.hex.txt	Hex baseline for generic POCO untyped serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GenericPocoString_Untyped_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for generic POCO untyped serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GenericPersonExternal_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for generic external person exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GenericPersonExternal_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for generic external person exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GenericPersonExternalStruct_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for generic external struct exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GenericPersonExternalStruct_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for generic external struct exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GeneratedRecordSerializer_UntypedRoot_MatchesBaseline.verified.hex.txt	Hex baseline for record serializer with untyped root.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GeneratedRecordSerializer_UntypedRoot_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for record serializer with untyped root.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GeneratedPolymorphicSerializer_BaseType_MatchesBaseline.verified.hex.txt	Hex baseline for polymorphic serialization via base type.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GeneratedPolymorphicSerializer_BaseType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for polymorphic serialization via base type.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GeneratedClassSerializer_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for baseline class exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GeneratedClassSerializer_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for baseline class exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GeneratedAutoFieldIdSerializer_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for auto-field-id serializer exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.GeneratedAutoFieldIdSerializer_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for auto-field-id serializer exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.DuplicateReferences_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for duplicate-reference tracking behavior.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.DuplicateReferences_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for duplicate-reference tracking behavior.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.DuplicateReferencesSuppressTracking_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for duplicate refs with suppress-tracking behavior.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.DuplicateReferencesSuppressTracking_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for duplicate refs with suppress-tracking behavior.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.DerivedFromDictionary_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for derived dictionary exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.DerivedFromDictionary_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for derived dictionary exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.ClassWithTypeFields_Untyped_MatchesBaseline.verified.hex.txt	Hex baseline for type-field-containing class untyped serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.ClassWithTypeFields_Untyped_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for type-field-containing class untyped serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.ClassWithRequiredMembers_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for required-members class exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.ClassWithRequiredMembers_ExactType_Formatted_MatchesSnapshot.verified.txt	Formatted snapshot for required-members class exact-type serialization.
test/Orleans.Serialization.UnitTests/snapshots/GeneratedSerializerBitwiseCompatibilityTests.ClassWithImplicitFieldIds_ExactType_MatchesBaseline.verified.hex.txt	Hex baseline for implicit field-id generation behavior.

Copilot's findings

• Files reviewed: 50/50 changed files
• Comments generated: 0