Add borg construction interaction test (#42359)

* Add test of borg construction.

* Return Validated when in validation mode.

* Update Content.IntegrationTests/Tests/Construction/Interaction/BorgConstruction.cs

---------

Co-authored-by: slarticodefast <161409025+slarticodefast@users.noreply.github.com>

Content.IntegrationTests/Tests/Construction/Interaction/BorgConstruction.cs

@@ -0,0 +1,63 @@
+using Content.IntegrationTests.Tests.Interaction;
+using Robust.Shared.Prototypes;
+
+namespace Content.IntegrationTests.Tests.Construction.Interaction;
+
+public sealed class BorgConstruction : InteractionTest
+{
+    /// <summary>
+    /// ID of the base endoskeleton to which parts will be added.
+    /// </summary>
+    private static readonly EntProtoId BorgEndoskeletonId = "CyborgEndoskeleton";
+
+    /// <summary>
+    /// ID of the entity that should be produced when construction is complete.
+    /// </summary>
+    private static readonly EntProtoId BorgCompleteId = "BorgChassisSelectable";
+
+    /// <summary>
+    /// ID of the Flashes needed for borg construction.
+    /// </summary>
+    private static readonly EntProtoId FlashId = "Flash";
+
+    /// <summary>
+    /// IDs of all the parts that need to be added to the endoskeleton to complete construction.
+    /// </summary>
+    private static readonly EntProtoId[] Parts =
+    [
+        "TorsoBorg",
+        "LightHeadBorg",
+        "LeftArmBorg",
+        "RightArmBorg",
+        "LeftLegBorg",
+        "RightLegBorg",
+    ];
+
+    /// <summary>
+    /// Spawns an endoskeleton and makes the player add each part to it by interacting with the parts in hand.
+    /// Verifies that the correct entity is produced as a result.
+    /// </summary>
+    [Test]
+    public async Task ConstructBorg()
+    {
+        // Spawn the endoskeleton frame.
+        await SpawnTarget(BorgEndoskeletonId);
+
+        // Have the player add each part needed for construction.
+        foreach (var part in Parts)
+        {
+            await InteractUsing(part);
+        }
+
+        // Finish construction.
+        await Interact(
+            Cable,
+            FlashId,
+            FlashId,
+            Screw
+        );
+
+        // Construction should have finished - make sure to the resulting entity is correct.
+        AssertPrototype(BorgCompleteId, Target);
+    }
+}