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docs/ai/DataPRO/StateMachine.Tests.md

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+---
+source_files:
+  - DataPRO/StateMachine.Tests/StatesShould.cs
+generated_at: "2026-04-17T16:14:08.282619+00:00"
+model: "zai-org/GLM-5-FP8"
+schema_version: 1
+sha256: "f3b6a750e8952451"
+---
+
+# StateMachine.Tests
+
+### Purpose
+This module contains unit tests for a singleton `States` factory class within the `DTS.DASLib.Service.StateMachine` namespace. It verifies that the `States` singleton is correctly initialized, that it maps `State` enum values to the correct `IDASState` instances, and that the `IDASFactory` dependency is properly propagated to all state instances.
+
+### Public Interface
+*   **`StatesShould` (TestFixture)**
+    *   `void Instance_ShouldNotBeNull()`: Verifies that the `States.Instance` singleton property returns a non-null reference.
+    *   `void Instance_ShouldBeSame()`: Verifies that `States.Instance` returns the same reference on subsequent calls (Singleton pattern guarantee).
+    *   `void States_ShouldReturnCorrectInstanceOfState()`: Verifies that specific properties on the `States` instance (e.g., `Arm`, `Arming`, `Configure`) return objects with the corresponding `State` enum value.
+    *   `void GetIDASState_ReturnAllKnownStates()`: Iterates through all defined values of the `State` enum and verifies that `States.Instance.GetIDASState(State)` returns an object with a matching `State` property.
+    *   `void GetIDASState_ShouldThrowException_WithUndefinedState()`: Verifies that calling `GetIDASState` with an invalid enum value (cast from integer `45`) throws an `InvalidOperationException` with the message "Undefined State".
+    *   `void SetDASFactory_ShouldSetToAnInstanceOfDASFactory()`: Verifies that `States.SetDASFactory(IDASFactory)` correctly injects the factory into all state instances retrieved via `GetIDASState`.
+
+### Invariants
+*   **Singleton Pattern:** `States.Instance` must always return the same object reference.
+*