style: reformat assertion blocks in test files

tests/integration/test_spectrum_pipeline.py

@@ -179,6 +179,7 @@ class TestDeclarativeDetectorResponse:
         detector = BetaSpectrum.create_detector_from_config(config)
 
         from beta_spectrum.components.detector_response import DetectorResponse
+
         assert isinstance(detector, DetectorResponse)
         assert detector.n_channels == 512
         assert detector._mode == "analytical"
@@ -278,9 +279,9 @@ class TestDeclarativeDetectorResponse:
         assert convolved.shape == (256,)
         # Normalized spectrum should integrate to ~1 over channel energies
         integral = np.trapezoid(convolved, detector.channel_energies)
-        assert np.isclose(
-            integral, 1.0, rtol=0.05
-        ), f"Integral should be ~1.0, got {integral}"
+        assert np.isclose(integral, 1.0, rtol=0.05), (
+            f"Integral should be ~1.0, got {integral}"
+        )
 
     @pytest.mark.skip(reason="DetectorResponse not yet implemented")
     def test_detector_range_extends_to_endpoint(self):