Fix test case for __main__

Author: berrydenhartog

tests/test_main.py

@@ -1,10 +1,12 @@
 import subprocess
 
+from python_project import __main__
+
 
 def test_main_process():
     completed_process = subprocess.run(["python", "-m", "python_project"], capture_output=True, text=True)
     assert completed_process.returncode == 0
 
 
 def test_main_function():
-    assert 0 == 0
+    assert __main__.main() == 0