chore: adds tests

tests/__mocks__/screeps.ts

@@ -0,0 +1,35 @@
+/**
+ * Minimal Screeps global mocks used across tests.
+ */
+
+// Constants
+(global as any).RESOURCE_ENERGY = 'energy';
+(global as any).ERR_NOT_IN_RANGE = -9;
+(global as any).OK = 0;
+(global as any).WORK = 'work';
+(global as any).CARRY = 'carry';
+(global as any).MOVE = 'move';
+
+// RoomPosition constructor mock
+(global as any).RoomPosition = class RoomPosition {
+    x: number;
+    y: number;
+    roomName: string;
+
+    constructor(x: number, y: number, roomName: string) {
+        this.x = x;
+        this.y = y;
+        this.roomName = roomName;
+    }
+
+    getRangeTo(_target: any): number {
+        return 0;
+    }
+};
+
+// Game mock
+(global as any).Game = {
+    getObjectById: jest.fn(),
+};
+
+export {};