Add exhaustive tests for JsonValue and JsonKey usage in value class

[k163377]

from ProjectMapK/jackson-module-kogera#358

[Copilot]

Pull Request Overview

This PR adds comprehensive tests to ensure both @jsonvalue and @jsonkey annotations work correctly with Kotlin inline value classes, covering primitive and object types in different usage contexts.

• Adds tests for direct serialization and DTO property serialization with value classes annotated with @jsonvalue.
• Adds tests for key serialization using value classes annotated with @jsonkey.
• Covers both non-nullable and nullable cases to assert expected JSON outputs.

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/test/kotlin/com/fasterxml/jackson/module/kotlin/kogeraIntegration/ser/valueClass/jsonValue/TwoUnitPrimitiveTest.kt	Tests for @jsonvalue with a Long value in both direct and property use.
src/test/kotlin/com/fasterxml/jackson/module/kotlin/kogeraIntegration/ser/valueClass/jsonValue/PrimitiveTest.kt	Tests for @jsonvalue with an Int value handling non-null and nullable cases.
src/test/kotlin/com/fasterxml/jackson/module/kotlin/kogeraIntegration/ser/valueClass/jsonValue/NullablePrimitiveTest.kt	Tests for @jsonvalue with a nullable primitive value.
src/test/kotlin/com/fasterxml/jackson/module/kotlin/kogeraIntegration/ser/valueClass/jsonValue/NullableObjectTest.kt	Tests for @jsonvalue with a nullable String object.
src/test/kotlin/com/fasterxml/jackson/module/kotlin/kogeraIntegration/ser/valueClass/jsonValue/NonNullObjectTest.kt	Tests for @jsonvalue with a non-nullable String object and its nullable variant.
src/test/kotlin/com/fasterxml/jackson/module/kotlin/kogeraIntegration/ser/valueClass/jsonKey/TwoUnitPrimitiveTest.kt	Tests for @jsonkey with a Long value validating key serialization.
src/test/kotlin/com/fasterxml/jackson/module/kotlin/kogeraIntegration/ser/valueClass/jsonKey/PrimitiveTest.kt	Tests for @jsonkey with an Int value in key scenarios.
src/test/kotlin/com/fasterxml/jackson/module/kotlin/kogeraIntegration/ser/valueClass/jsonKey/NullablePrimitiveTest.kt	Tests for @jsonkey with a nullable primitive value.
src/test/kotlin/com/fasterxml/jackson/module/kotlin/kogeraIntegration/ser/valueClass/jsonKey/NullableObjectTest.kt	Tests for @jsonkey with a nullable String object as key.
src/test/kotlin/com/fasterxml/jackson/module/kotlin/kogeraIntegration/ser/valueClass/jsonKey/NonNullObjectTest.kt	Tests for @jsonkey with both non-nullable and nullable String objects as keys.