---
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.
*