check

tests/test_ring_buffer.py

@@ -84,6 +84,7 @@ class RingBufferTests(unittest.TestCase):
 
         expected = compute_fft_mag_row(complex_input, freqs, ring.fft_bins, mode="direct")
         self.assertTrue(np.allclose(ring.get_last_fft_linear(), expected))
+        self.assertFalse(np.iscomplexobj(ring.get_display_fft_linear()))
         self.assertTrue(np.allclose(ring.get_display_raw()[: display_sweep.size, -1], display_sweep))
 
     def test_ring_buffer_reset_clears_cached_history(self):