diff --git a/godot_parser/files.py b/godot_parser/files.py
index 6115055..0fc3282 100644
--- a/godot_parser/files.py
+++ b/godot_parser/files.py
@@ -7,7 +7,6 @@
     Optional,
     Sequence,
     Type,
-    TypeVar,
     Union,
     cast,
 )
@@ -39,9 +38,6 @@
 ]
 
 
-GDFileType = TypeVar("GDFileType", bound="GDFile")
-
-
 class GodotFileException(Exception):
     """Thrown when there are errors in a Godot file"""
 
@@ -304,12 +300,12 @@ def get_node(self, path: str = ".") -> Optional[GDNodeSection]:
         return node.section if node is not None else None
 
     @classmethod
-    def parse(cls: Type[GDFileType], contents: str):
+    def parse(cls, contents: str):
         """Parse the contents of a Godot file"""
         return cls.from_parser(scene_file.parse_string(contents, parseAll=True))
 
     @classmethod
-    def load(cls: Type[GDFileType], filepath: str):
+    def load(cls, filepath: str):
         with open(filepath, "r", encoding="utf-8") as ifile:
             try:
                 file = cls.parse(ifile.read())
@@ -322,7 +318,7 @@ def load(cls: Type[GDFileType], filepath: str):
         return file
 
     @classmethod
-    def from_parser(cls: Type[GDFileType], parse_result):
+    def from_parser(cls, parse_result):
         first_section = parse_result[0]
         if first_section.header.name == "gd_scene":
             scene = GDScene.__new__(GDScene)
@@ -334,7 +330,6 @@ def from_parser(cls: Type[GDFileType], parse_result):
             return resource
 
         return cls(*parse_result)
-        raise GodotFileException("Unknown GDFileType %s" % first_section.header.name)
 
     def write(self, filename: str):
         """Writes this to a file"""
@@ -386,6 +381,7 @@ def remove_at(self, index: int):
         section = self._sections.pop(index)
         if section.header.name in ["ext_resource", "sub_resource"]:
             self.load_steps -= 1
+        return section
 
     def remove_unused_resources(self):
         self._remove_unused_resources(self.get_ext_resources(), ExtResource)
@@ -460,3 +456,6 @@ def __init__(self, *sections: GDSection) -> None:
 class GDResource(GDCommonFile):
     def __init__(self, *sections: GDSection) -> None:
         super().__init__("gd_resource", *sections)
+
+
+GDFileType = Union[GDFile, GDScene, GDResource]
diff --git a/requirements_test.txt b/requirements_test.txt
index c6bdd41..f595fea 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -3,3 +3,4 @@ black
 isort
 mypy
 pylint==2.17.7
+beartype
diff --git a/tests/test_parser.py b/tests/test_parser.py
index 1eeaf69..99f3120 100644
--- a/tests/test_parser.py
+++ b/tests/test_parser.py
@@ -1,15 +1,18 @@
 import os
-from typing import Optional, Union
+from typing import Optional
 import unittest
 
 from pyparsing import ParseException
 
+from beartype.door import is_bearable
+
 from godot_parser import GDFile, GDObject, GDSection, GDSectionHeader, Vector2, parse
-from godot_parser.files import GDResource, GDScene
+from godot_parser.files import GDFileType
 
 HERE = os.path.dirname(__file__)
 
-TEST_CASES = [
+
+TEST_CASES: list[tuple[str, GDFileType]] = [
     (
         "[gd_scene load_steps=5 format=2]",
         GDFile(GDSection(GDSectionHeader("gd_scene", load_steps=5, format=2))),
@@ -51,7 +54,7 @@
                 GDSectionHeader("sub_resource", type="RectangleShape2D", id=1),
                 extents=Vector2(12.7855, 17.0634),
                 other=None,
-                **{"with spaces": 1}
+                **{"with spaces": 1},
             )
         ),
     ),
@@ -71,7 +74,7 @@
                         "update": 0,
                         "values": [Vector2(0, 0), Vector2(1, 0)],
                     }
-                }
+                },
             )
         ),
     ),
@@ -108,7 +111,7 @@
                     "0:0/0": 0,
                     "0:0/0/physics_layer_0/linear_velocity": Vector2(0, 0),
                     "0:0/0/physics_layer_0/angular_velocity": 0.0,
-                }
+                },
             )
         ),
     ),
@@ -116,11 +119,9 @@
 
 
 class TestParser(unittest.TestCase):
-    """ """
-
-    def _run_test(self, string: str, expected):
+    def _run_test(self, string: str, expected: GDFileType):
         """Run a set of tests"""
-        parse_result: Optional[Union[GDScene, GDResource]] = None
+        parse_result: Optional[GDFileType] = None
         try:
             parse_result = parse(string)
             if expected == "error":
@@ -128,8 +129,8 @@ def _run_test(self, string: str, expected):
                     string,
                     parse_result,
                 )
-            else:
-                self.assertEqual(parse_result, expected)
+            condition = is_bearable(parse_result, GDFileType)
+            assert condition, f"Expected {type(expected)}, got {type(parse_result)}"
         except ParseException as e:
             if expected != "error":
                 print(string)