Add ability to read IDs from files

tests/integration_tests/test_download_integration.py

@@ -306,3 +306,17 @@ def test_cli_download_disable_modules(test_args: list[str], tmp_path: Path):
     assert result.exit_code == 0
     assert 'skipped due to disabled module' in result.output
     assert 'Downloaded submission' not in result.output
+
+
+@pytest.mark.online
+@pytest.mark.reddit
+@pytest.mark.skipif(not does_test_config_exist, reason='A test config file is required for integration tests')
+def test_cli_download_include_id_file(tmp_path: Path):
+    test_file = Path(tmp_path, 'include.txt')
+    test_args = ['--include-id-file', str(test_file)]
+    test_file.write_text('odr9wg\nody576')
+    runner = CliRunner()
+    test_args = create_basic_args_for_download_runner(test_args, tmp_path)
+    result = runner.invoke(cli, test_args)
+    assert result.exit_code == 0
+    assert 'Downloaded submission' in result.output