Add climb & slip tests (#15459)

Content.IntegrationTests/Tests/Interaction/MovementTest.cs

@@ -0,0 +1,65 @@
+#nullable enable
+using System;
+using System.Threading.Tasks;
+using NUnit.Framework;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Maths;
+
+namespace Content.IntegrationTests.Tests.Interaction;
+
+/// <summary>
+/// This is a variation of <see cref="InteractionTest"/> that sets up the player with a normal human entity and a simple
+/// linear grid with gravity and an atmosphere. It is intended to make it easier to test interactions that involve
+/// walking (e.g., slipping or climbing tables).
+/// </summary>
+public abstract class MovementTest : InteractionTest
+{
+    protected override string PlayerPrototype => "MobHuman";
+
+    /// <summary>
+    ///     Number of tiles to add either side of the player.
+    /// </summary>
+    protected virtual int Tiles => 3;
+
+    /// <summary>
+    ///     If true, the tiles at the ends of the grid will have a wall placed on them to avoid players moving off grid.
+    /// </summary>
+    protected virtual bool AddWalls => true;
+
+    [SetUp]
+    public override async Task Setup()
+    {
+        await base.Setup();
+        for (var i = -Tiles; i <= Tiles; i++)
+        {
+            await SetTile(Plating, PlayerCoords.Offset((i,0)), MapData.MapGrid);
+        }
+        AssertGridCount(1);
+
+        if (AddWalls)
+        {
+            await SpawnEntity("WallSolid", PlayerCoords.Offset((-Tiles,0)));
+            await SpawnEntity("WallSolid", PlayerCoords.Offset((Tiles,0)));
+        }
+
+        await AddGravity();
+        await AddAtmosphere();
+    }
+
+    /// <summary>
+    ///     Get the relative horizontal between two entities. Defaults to using the target & player entity.
+    /// </summary>
+    protected float Delta(EntityUid? target = null, EntityUid? other = null)
+    {
+        target ??= Target;
+        if (target == null)
+        {
+            Assert.Fail("No target specified");
+            return 0;
+        }
+
+        var delta =  Transform.GetWorldPosition(target.Value) - Transform.GetWorldPosition(other ?? Player);
+        return delta.X;
+    }
+}
+