add new old fourier

tests/test_ring_buffer.py

@@ -39,6 +39,23 @@ class RingBufferTests(unittest.TestCase):
         self.assertIsNotNone(ring.last_fft_db)
         self.assertEqual(ring.last_fft_db.shape, (ring.fft_bins,))
 
+    def test_ring_buffer_can_switch_fft_mode_and_rebuild_fft_rows(self):
+        ring = RingBuffer(max_sweeps=2)
+        sweep = np.linspace(0.0, 1.0, 64, dtype=np.float32)
+        freqs = np.linspace(3.3, 14.3, 64, dtype=np.float64)
+        ring.push(sweep, freqs)
+        fft_before = ring.last_fft_db.copy()
+        axis_before = ring.distance_axis.copy()
+
+        changed = ring.set_symmetric_fft_enabled(False)
+
+        self.assertTrue(changed)
+        self.assertFalse(ring.fft_symmetric)
+        self.assertEqual(ring.get_display_raw().shape[1], 2)
+        self.assertEqual(ring.last_fft_db.shape, fft_before.shape)
+        self.assertFalse(np.allclose(ring.last_fft_db, fft_before))
+        self.assertFalse(np.allclose(ring.distance_axis, axis_before))
+
 
 if __name__ == "__main__":
     unittest.main()