Cover multiple ancestors and repeated types in inherited generic constructor rows #7545

Summary

The inherited constructor argument regression fixtures do not exercise rows on two different ancestors, multiple rows inferring the same concrete type, or identical values on a derived class and its base. A discovery regression could drop these rows without failing the current snapshots.

Prerequisite

Blocked by #7542, delivered by open PR #7544. The referenced fixtures are introduced by that PR and are not yet on main; extend them after it merges.

Reproduction

In tests/TUnit.TestProject/Bugs/_7490/Tests.cs at commit bff3e03, both inherited rows are declared on ArgumentsBase, while IntermediateBase has no rows. Each existing constructor row infers a different type.

Expected and actual

Add [Arguments(43)] to IntermediateBase and update the value checks. Extend generator snapshots to prove both integer rows survive and each produces both generic-method combinations. Add an identical literal on a derived class and base and assert the intended row multiplicity and ordering. Run targeted fixtures in both generated and reflection discovery modes, plus affected generator snapshots.

Current coverage cannot detect these losses. This is non-blocking follow-up from PR #7544, whose reviewers approved the implementation.

Please extend the inherited generic constructor-row regression coverage to cover these cases.