Add tests for _get_backend_identifier

tests/test_backend_identifier.py

@@ -0,0 +1,79 @@
+import pytest
+
+from sigma.plugins import InstalledSigmaPlugins
+from sigma.conversion.base import TextQueryBackend
+from sigma.backends.test import TextQueryTestBackend, MandatoryPipelineTestBackend
+
+
+class DummyBackend(TextQueryBackend):
+    """Dummy backend for testing purposes."""
+
+    identifier = "dummy"
+
+
+class DummyTestBackend(DummyBackend):
+    """Dummy backend for testing purposes."""
+
+    identifier = "dummy_test"
+
+
+class Dummy2TestBackend(DummyBackend):
+    """Dummy backend for testing purposes."""
+
+    # This won't be used, because the identifier is already set by DummyTestBackend.
+    __identifier__ = "dummy2_test"
+
+
+class DummyDunderIdentifierBackend(TextQueryBackend):
+    """Dummy backend for testing purposes."""
+
+    __identifier__ = "dummy_dunder_identifier"
+
+
+class AnotherDummyTestBackend(TextQueryBackend):
+    """Dummy backend for testing purposes."""
+
+    pass
+
+
+class something_something_backend(TextQueryBackend):
+    """Dummy backend for testing purposes."""
+
+    pass
+
+
+class BackendBackend(TextQueryBackend):
+    """Dummy backend for testing purposes."""
+
+    pass
+
+
+class BaseBackend(TextQueryBackend):
+    """Dummy backend for testing purposes."""
+
+    pass
+
+
+@pytest.mark.parametrize(
+    "backend_class, expected_backend_identifier",
+    [
+        (None, ""),
+        (TextQueryBackend, "text_query"),
+        (DummyBackend, "dummy"),
+        (DummyTestBackend, "dummy_test"),
+        (Dummy2TestBackend, "dummy"),  # Dummy2TestBackend.__identifier__ won't be used.
+        (DummyDunderIdentifierBackend, "dummy_dunder_identifier"),  # __identifier__ is used.
+        (AnotherDummyTestBackend, "another_dummy_test"),  # identifier is generated from __name__.
+        (something_something_backend, "something_something"),
+        (BackendBackend, "backend"),
+        (BaseBackend, "test_backend_identifier"),  # test file is the module name.
+        (TextQueryTestBackend, "text_query_test"),
+        (MandatoryPipelineTestBackend, "mandatory_pipeline_test"),
+    ],
+)
+def test_get_backend_identifier(backend_class, expected_backend_identifier):
+    """Test that the backend identifier is correctly returned."""
+    assert (
+        InstalledSigmaPlugins._get_backend_identifier(backend_class, "")
+        == expected_backend_identifier
+    )