Validate each pydisassemble input

pytest/test_pydisassemble_cli.py

@@ -0,0 +1,26 @@
+import sys
+
+from uncompyle6.bin import pydisassemble
+
+
+def test_main_checks_each_input_file(tmp_path, monkeypatch, capsys):
+    existing = tmp_path / "existing.pyc"
+    missing = tmp_path / "missing.pyc"
+    existing.write_bytes(b"")
+    disassembled = []
+
+    monkeypatch.setattr(
+        pydisassemble,
+        "disassemble_file",
+        lambda filename, outstream: disassembled.append(filename),
+    )
+    monkeypatch.setattr(
+        sys,
+        "argv",
+        ["pydisassemble", str(existing), str(missing)],
+    )
+
+    pydisassemble.main()
+
+    assert disassembled == [str(existing)]
+    assert f"Can't read {missing} - skipping" in capsys.readouterr().err

uncompyle6/bin/pydisassemble.py

@@ -94,10 +94,10 @@ def main():
             sys.exit(1)
 
     for file in files:
-        if os.path.exists(files[0]):
+        if os.path.exists(file):
             disassemble_file(file, sys.stdout)
         else:
-            print(f"Can't read {files[0]} - skipping", file=sys.stderr)
+            print(f"Can't read {file} - skipping", file=sys.stderr)
             pass
         pass
     return