Implement Elevator mock, diagnostics, and unit tests (with tests in subfolder)

Diagnostics.cs

@@ -0,0 +1,43 @@
+namespace ElevatorDiag;
+
+public record ElevatorHealth(
+    bool IsHealthy,
+    ElevatorState State,
+    int CurrentFloor,
+    double PrecisePosition,
+    string? ActiveFault,
+    int PendingRequestsCount
+);
+
+public class ElevatorDiagnostics
+{
+    private readonly Elevator _elevator;
+
+    public ElevatorDiagnostics(Elevator elevator)
+    {
+        _elevator = elevator;
+    }
+
+    public ElevatorHealth GetHealth()
+    {
+        return new ElevatorHealth(
+            _elevator.State != ElevatorState.Faulted,
+            _elevator.State,
+            _elevator.CurrentFloor,
+            _elevator.CurrentPosition,
+            _elevator.LastFault,
+            _elevator.TargetFloors.Count
+        );
+    }
+
+    public string GetStatusReport()
+    {
+        var health = GetHealth();
+        return $"[Elevator Report]\n" +
+               $"Status: {(health.IsHealthy ? "OK" : "FAULTED")}\n" +
+               $"State: {health.State}\n" +
+               $"Floor: {health.CurrentFloor} ({health.PrecisePosition:F2})\n" +
+               $"Pending: {health.PendingRequestsCount} floors\n" +
+               (health.ActiveFault != null ? $"Fault Detail: {health.ActiveFault}\n" : "");
+    }
+}

Elevator.cs

@@ -0,0 +1,108 @@
+namespace ElevatorDiag;
+
+public enum ElevatorState
+{
+    Idle,
+    MovingUp,
+    MovingDown,
+    DoorOpen,
+    Faulted
+}
+
+public class Elevator
+{
+    public int CurrentFloor { get; private set; } = 1;
+    public double CurrentPosition { get; private set; } = 1.0;
+    public ElevatorState State { get; private set; } = ElevatorState.Idle;
+    public List<int> TargetFloors { get; } = new();
+    public string? LastFault { get; private set; }
+
+    private const double Speed = 0.5; // floors per tick
+    private const int DoorHoldTicks = 3;
+    private int _doorTimer = 0;
+
+    public void RequestFloor(int floor)
+    {
+        if (State == ElevatorState.Faulted) return;
+        if (!TargetFloors.Contains(floor))
+        {
+            TargetFloors.Add(floor);
+            // No automatic sort here, we'll handle direction in GetNextTarget
+        }
+    }
+
+    public void Update()
+    {
+        if (State == ElevatorState.Faulted) return;
+
+        if (State == ElevatorState.DoorOpen)
+        {
+            _doorTimer++;
+            if (_doorTimer >= DoorHoldTicks)
+            {
+                _doorTimer = 0;
+                State = ElevatorState.Idle;
+            }
+            return;
+        }
+
+        if (TargetFloors.Count == 0)
+        {
+            State = ElevatorState.Idle;
+            return;
+        }
+
+        int target = GetNextTarget();
+        
+        if (CurrentPosition < target)
+        {
+            State = ElevatorState.MovingUp;
+            CurrentPosition += Speed;
+        }
+        else if (CurrentPosition > target)
+        {
+            State = ElevatorState.MovingDown;
+            CurrentPosition -= Speed;
+        }
+
+        CurrentFloor = (int)Math.Round(CurrentPosition);
+
+        if (Math.Abs(CurrentPosition - target) < 0.01)
+        {
+            CurrentPosition = target;
+            CurrentFloor = target;
+            TargetFloors.Remove(target);
+            State = ElevatorState.DoorOpen;
+        }
+    }
+
+    private int GetNextTarget()
+    {
+        // Simple logic: if moving, keep moving in same direction if targets exist
+        if (State == ElevatorState.MovingUp)
+        {
+            var up = TargetFloors.Where(f => f > CurrentPosition).OrderBy(f => f).FirstOrDefault();
+            if (up != 0) return up;
+        }
+        if (State == ElevatorState.MovingDown)
+        {
+            var down = TargetFloors.Where(f => f < CurrentPosition).OrderByDescending(f => f).FirstOrDefault();
+            if (down != 0) return down;
+        }
+        
+        // Closest if idle or changed direction
+        return TargetFloors.OrderBy(f => Math.Abs(f - CurrentPosition)).First();
+    }
+
+    public void TriggerFault(string reason)
+    {
+        State = ElevatorState.Faulted;
+        LastFault = reason;
+    }
+
+    public void ResetFault()
+    {
+        State = ElevatorState.Idle;
+        LastFault = null;
+    }
+}

ElevatorDiag.Tests/ElevatorDiag.Tests.csproj

@@ -0,0 +1,25 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.4" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ElevatorDiag\ElevatorDiag.csproj" />
+  </ItemGroup>
+
+</Project>

ElevatorDiag.Tests/ElevatorTests.cs

@@ -0,0 +1,66 @@
+using ElevatorDiag;
+
+namespace ElevatorDiag.Tests;
+
+public class ElevatorTests
+{
+    [Fact]
+    public void RequestFloor_MovesToFloor()
+    {
+        var elevator = new Elevator();
+        elevator.RequestFloor(3);
+        
+        // Floor 1 to 3 at 0.5/tick = 4 ticks to move
+        // T1: Pos 1.5, T2: Pos 2.0, T3: Pos 2.5, T4: Pos 3.0 (DoorOpen)
+        for(int i = 0; i < 4; i++) elevator.Update();
+
+        Assert.Equal(3, elevator.CurrentFloor);
+        Assert.Equal(ElevatorState.DoorOpen, elevator.State);
+    }
+
+    [Fact]
+    public void Fault_StopsMovement()
+    {
+        var elevator = new Elevator();
+        elevator.RequestFloor(5);
+        elevator.Update(); // Start moving (Pos 1.5)
+        
+        elevator.TriggerFault("Emergency Stop");
+        var posBefore = elevator.CurrentPosition;
+        
+        elevator.Update();
+        
+        Assert.Equal(ElevatorState.Faulted, elevator.State);
+        Assert.Equal(posBefore, elevator.CurrentPosition);
+    }
+
+    [Fact]
+    public void Priority_HandlesMultipleRequests()
+    {
+        var elevator = new Elevator();
+        // Requests 5 then 2. From 1, it should go 1 -> 2 -> 5.
+        elevator.RequestFloor(5);
+        elevator.RequestFloor(2);
+
+        // Tick 1: Moving to 2 (Pos 1.5)
+        elevator.Update();
+        // Tick 2: Arrives at 2 (Pos 2.0, DoorOpen)
+        elevator.Update();
+        
+        Assert.Equal(2, elevator.CurrentFloor);
+        Assert.Equal(ElevatorState.DoorOpen, elevator.State);
+    }
+
+    [Fact]
+    public void Diagnostics_ReportsCorrectState()
+    {
+        var elevator = new Elevator();
+        var diag = new ElevatorDiagnostics(elevator);
+        
+        elevator.TriggerFault("Sensor Failure");
+        var health = diag.GetHealth();
+        
+        Assert.False(health.IsHealthy);
+        Assert.Equal("Sensor Failure", health.ActiveFault);
+    }
+}

ElevatorDiag.Tests/UnitTest1.cs

@@ -0,0 +1,10 @@
+namespace ElevatorDiag.Tests;
+
+public class UnitTest1
+{
+    [Fact]
+    public void Test1()
+    {
+
+    }
+}

ElevatorDiag.Tests/bin/Debug/net10.0/ElevatorDiag.Tests.deps.json

@@ -0,0 +1,580 @@
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+  "runtimeTarget": {
+    "name": ".NETCoreApp,Version=v10.0",
+    "signature": ""
+  },
+  "compilationOptions": {},
+  "targets": {
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+          "ElevatorDiag": "1.0.0",
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+        },
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+        }
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