refactor: remove sys.path hacks from test_multichannel.py

Author: jmrplens

tests/test_multichannel.py

@@ -3,14 +3,7 @@
 Multichannel processing validation tests.
 """
 
-import os
-import sys
-
 import numpy as np
-
-# Ensure local package is used
-sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "../src")))
-
 from pyoctaveband import octavefilter
 
 
@@ -29,36 +22,21 @@ def test_multichannel() -> None:
 
     x = np.vstack((ch1, ch2))
 
-    print(f"Testing stereo input with shape: {x.shape}")
     spl, freq = octavefilter(x, fs, fraction=3)
 
-    print(f"Resulting SPL shape: {spl.shape}")
     assert spl.shape == (2, len(freq)), "Output SPL should maintain channel count"
 
     # Verify Channel 1 (Tone) peaks near 500Hz
     target_idx = np.argmin(np.abs(np.array(freq) - 500))
     max_idx = np.argmax(spl[0])
-    print(f"Ch 1 Peak: {freq[max_idx]:.1f} Hz (Target: {freq[target_idx]:.1f} Hz)")
     assert abs(max_idx - target_idx) <= 1, "Tone peak not detected in correct band"
 
     # Verify Channel 2 (Noise) has lower variance than Tone
     std_tone = np.std(spl[0])
     std_noise = np.std(spl[1])
-    print(f"SPL Std Dev - Tone: {std_tone:.2f}, Noise: {std_noise:.2f}")
     assert std_tone > std_noise, "Tone should have higher spectral variance than noise"
 
-    print("Multichannel SPL test: OK")
-
     # Verify time-domain band splitting
-    print("Testing 'sigbands' mode...")
     _, _, xb = octavefilter(x, fs, fraction=3, sigbands=True)
-    if xb is None:
-        raise ValueError("xb should not be None when sigbands=True")
-
-    print(f"Extracted {len(xb)} bands.")
+    assert xb is not None, "xb should not be None when sigbands=True"
     assert xb[0].shape == (2, len(t)), "Bands should maintain stereo shape and length"
-    print("Multichannel sigbands test: OK")
-
-
-if __name__ == "__main__":
-    test_multichannel()