test(rapl): assert non-power domains keep their own name

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: davidberenstein1957

tests/test_rapl_parameters.py

@@ -524,3 +524,26 @@ def test_rapl_parameters_stored_correctly(tmp_path):
     )
     assert rapl_true.rapl_include_dram is True
     assert rapl_true.rapl_prefer_psys is True
+
+
+@pytest.mark.skipif(not sys.platform.lower().startswith("lin"), reason="requires Linux")
+def test_rapl_non_power_domain_keeps_its_own_name(tmp_path):
+    """
+    When no package/psys/dram domain exists, the remaining domains are used as a
+    fallback but must not be renamed into the aggregated "Processor Energy" total.
+    """
+    base = tmp_path
+    rapl_provider = base / "intel-rapl"
+    rapl_provider.mkdir()
+
+    d_core = rapl_provider / "intel-rapl:0"
+    d_core.mkdir()
+    (d_core / "name").write_text("core")
+    (d_core / "energy_uj").write_text("1000000")
+    (d_core / "max_energy_range_uj").write_text("262143328850")
+
+    rapl = IntelRAPL(rapl_dir=str(base))
+
+    names = [f.name for f in rapl._rapl_files]
+    assert names, "Fallback should still expose the available domain"
+    assert not any("Processor Energy" in name for name in names), names