Add final progression to tiny sword, fixes and tweeks required

tests/test_gold_mine_click.gd

@@ -5,8 +5,7 @@ var failed: int = 0
 var _game_root: Node = null
 
 func _ready():
-    await run()
-    # Don't quit here - let test_runner handle it
+    pass  # run() is called by the test runner; avoid double-execution.
 
 func run():
     print("\n=== TEST: Gold Mine Click ===\n")
@@ -15,34 +14,62 @@ func run():
     # Load tiny_sword scene
     var scene = load("res://docs/gyms/tiny_sword/tiny_sword.tscn")
     _game_root = scene.instantiate()
+    
+    # Use a unique save path to avoid contamination from previous test runs.
+    var save_path: String = "user://test_gold_mine_%d.json" % randi()
+    DirAccess.remove_absolute(ProjectSettings.globalize_path(save_path))
+    var gs: LevelGameState = _game_root.get_node("LevelGameState")
+    gs.save_file_path = save_path
+    
     add_child(_game_root)
     
     await _wait()
     
     var game_state: LevelGameState = _game_root.find_child("LevelGameState")
-    var gold_mine = _game_root.find_child("GoldMine") as CurrencyGenerator
+    var gold_mine_node: Node = _game_root.find_child("GoldMine")
     
     if game_state == null:
         print("[ERROR] LevelGameState not found")
         _print_summary()
         return
     
-    if gold_mine == null:
+    if gold_mine_node == null:
         print("[ERROR] GoldMine node not found")
         _print_summary()
         return
     
-    # Record initial gold
-    var initial_gold: BigNumber = game_state.get_currency_amount_by_id(&"gold")
+    var gold_mine: CurrencyGenerator = gold_mine_node.find_child("CurrencyGenerator") as CurrencyGenerator
+    if gold_mine == null:
+        print("[ERROR] CurrencyGenerator not found under GoldMine")
+        _print_summary()
+        return
+    
+    # Verify game_state is reachable and generator is available
+    TestUtils.assert_not_null(gold_mine.game_state, "game_state is not null")
+    TestUtils.assert_true(gold_mine.is_available_to_player(), "Gold Mine is available to player")
+    
+    # Record initial gold (copy to avoid BigNumber reference sharing)
+    var initial_gold: BigNumber = BigNumber.new(
+        game_state.get_currency_amount_by_id(&"gold").mantissa,
+        game_state.get_currency_amount_by_id(&"gold").exponent
+    )
     print("[TARGET] initial_gold: %s" % initial_gold.to_string_suffix(2))
     
+    # Temporarily set press_buys_generator to false so _on_pressed grants click currency
+    # (Gold Mine defaults to true which would try to buy with workers instead)
+    var original_press_buys: bool = gold_mine.press_buys_generator
+    gold_mine.press_buys_generator = false
+    
     # Simulate clicking the generator
     gold_mine._on_pressed()
     
     await _wait()
     
-    # Validate gold increased
-    var final_gold: BigNumber = game_state.get_currency_amount_by_id(&"gold")
+    # Validate gold increased (copy to avoid BigNumber reference sharing)
+    var final_gold: BigNumber = BigNumber.new(
+        game_state.get_currency_amount_by_id(&"gold").mantissa,
+        game_state.get_currency_amount_by_id(&"gold").exponent
+    )
     print("[TARGET] final_gold: %s" % final_gold.to_string_suffix(2))
     
     TestUtils.assert_greater_than(