Change error message when register_reader() is called outside from conftest.py (#32)

Author: yugokato

src/pytest_data_loader/loaders/reader.py

@@ -117,7 +117,7 @@ def register_reader(
 
     if caller_file.name != "conftest.py":
         raise RuntimeError(
-            f"{__package__}.{register_reader.__name__}() must be called from a conftest.py, "
+            f"{__name__.split('.')[0]}.{register_reader.__name__}() must be called from a conftest.py, "
             f"not from {str(caller_file)!r}"
         )
     return FileReader.register(caller_file, ext, file_reader, **read_options)

tests/tests_plugin/test_file_reader_registration.py

@@ -132,7 +132,7 @@ def test_file_reader_registration_in_non_conftest(pytester: Pytester) -> None:
     result = pytester.runpytest_subprocess()
     assert result.ret == ExitCode.INTERRUPTED
     result.assert_outcomes(errors=1)
-    assert "must be called from a conftest.py" in str(result.stdout)
+    assert "pytest_data_loader.register_reader() must be called from a conftest.py" in str(result.stdout)
 
 
 def _setup_data(pytester: Pytester, ext: str = ".txt") -> tuple[str, str]: