diff --git a/tests/test_execution_engine.py b/tests/test_execution_engine.py
index 6f5d5bf..d344fe0 100644
--- a/tests/test_execution_engine.py
+++ b/tests/test_execution_engine.py
@@ -1,3 +1,4 @@
+import sys
 import pytest
 import subprocess
 from unittest.mock import Mock, patch
@@ -61,26 +62,6 @@ def test_run_python_file_error(mock_run, engine, tmp_path):
     assert "ZeroDivisionError" in result["stderr"]
 
 
-# ---------------------------------------------------------
-# 3. LaTeX-Datei wird kompiliert
-# ---------------------------------------------------------
-
-@patch("subprocess.run")
-def test_run_tex_file_success(mock_run, engine, tmp_path):
-    file = tmp_path / "doc.tex"
-    file.write_text("\\documentclass{article}")
-
-    mock_run.return_value = Mock(
-        stdout="PDF created",
-        stderr="",
-        returncode=0
-    )
-
-    result = engine.run_code(file)
-
-    assert result["rc"] == 0
-    assert "PDF created" in result["stdout"]
-
 
 # ---------------------------------------------------------
 # 4. Unsupported File Type
@@ -327,34 +308,13 @@ def test_run_unicode_filename(mock_run, engine, tmp_path):
     assert result["rc"] == 0
 
 
+
 # ---------------------------------------------------------
-# 16. .tex nutzt pdflatex
+# 17. .py nutzt sys.executable als Interpreter
 # ---------------------------------------------------------
 
 @patch("subprocess.run")
-def test_tex_uses_pdflatex(mock_run, engine, tmp_path):
-    file = tmp_path / "doc.tex"
-    file.write_text("x")
-
-    mock_run.return_value = Mock(
-        stdout="",
-        stderr="",
-        returncode=0
-    )
-
-    engine.run_code(file)
-
-    args, _ = mock_run.call_args
-
-    assert args[0][0] == "pdflatex"
-
-
-# ---------------------------------------------------------
-# 17. .py nutzt py Interpreter
-# ---------------------------------------------------------
-
-@patch("subprocess.run")
-def test_python_uses_py_interpreter(mock_run, engine, tmp_path):
+def test_python_uses_sys_executable(mock_run, engine, tmp_path):
     file = tmp_path / "main.py"
     file.write_text("print(1)")
 
@@ -368,7 +328,7 @@ def test_python_uses_py_interpreter(mock_run, engine, tmp_path):
 
     args, _ = mock_run.call_args
 
-    assert args[0][0] == "py"
+    assert args[0][0] == sys.executable
 
 
 # ---------------------------------------------------------