testing in the test for missing obj files

tests/test_example_elfs.py

@@ -1,11 +1,15 @@
 import pelfy
 import glob
 
+
 def known_name(text: str):
     return not text.isnumeric() and not text.startswith('0x')
 
+
 def test_simple_c():
-    for path in glob.glob('tests/obj/*.o'):
+    file_list = glob.glob('tests/obj/*.o')
+    assert file_list, "No test object files found"
+    for path in file_list:
         print(f'Open {path}...')
         elf = pelfy.open_elf_file(path)
 
@@ -24,5 +28,6 @@ def test_simple_c():
         for reloc in elf.get_relocations():
             assert known_name(reloc.type), f"Relocation type {reloc.type} for {elf.architecture} in {path} is unknown."
 
+
 if __name__ == '__main__':
     test_simple_c()