Fix #89

[samatstariongroup]

Fixes #89.

Implements the single stubbed derived-property computation in SysML2.NET/Extend/ActionDefinitionExtensions.cs.

Change

List<IActionUsage> ComputeAction(this IActionDefinition) previously threw NotSupportedException. It now implements the OCL derivation:

action = usage->selectByKind(ActionUsage)

as [.. actionDefinitionSubject.usage.OfType<IActionUsage>()], with an ArgumentNullException guard on the subject. This mirrors the existing CalculationDefinitionExtensions.ComputeCalculation implementation.

Ordering contract

Per the metamodel (ActionDefinition::action, constraint deriveActionDefinitionAction), action is derived, ordered and usage (inherited from Definition) is likewise derived, ordered. The implementation preserves this contract: OfType<IActionUsage>() enumerates the ordered usage list in source order and [.. ] materializes that order, so action follows usage's ordering. ActionUsage → OccurrenceUsage → Usage, so the selectByKind(ActionUsage) filter over usage : Usage [0..*] is well-formed.

Tests

SysML2.NET.Tests/Extend/ActionDefinitionExtensionsTestFixture.cs — the obsolete placeholder test (asserting NotSupportedException) is replaced with VerifyComputeAction covering:

• null subject → ArgumentNullException
• empty ActionDefinition → empty result
• positive (ActionUsage returned) + negative (bare Usage filtered out)

Solution builds with 0 errors; the fixture passes (1/1).

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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