DAT-1116

[marcj-planet]

No description provided.

[Copilot]

🟢 Approval recommended

Changes are straightforward build/test improvements and the added test aligns with the intended polymorphic model behavior without introducing risky logic changes.

Pull request overview

This PR updates the generator project’s build configuration and adds a focused JUnit test to validate discriminator-based polymorphic deserialization for generated OpenAPI union models.

Changes:

• Added a new JUnit test (PolymorphicModelsTest) to verify discriminator values resolve to the expected concrete model types.
• Updated multiple dependency/plugin versions and switched the OpenAPI input spec path to src/main/resources/openapi.json.
• Added build-helper-maven-plugin to include generated OpenAPI sources as a compile source root, and added the JUnit Jupiter engine dependency for test execution.

File summaries

File	Description
src/test/java/ch/datatrans/model/PolymorphicModelsTest.java	Adds a discriminator-to-concrete-type assertion test for polymorphic generated models.
pom.xml	Updates dependency/plugin versions, points generation to openapi.json, and ensures generated sources are compiled and JUnit engine is present.

Review details

• Files reviewed: 2/4 changed files
• Comments generated: 0
• Review effort level: Lite

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