Remove test_setup.py.

tests/test_setup.py

-"""Test Setup."""
-import unittest
-import numpy as np
-import os
-
-
-class TestSetup(unittest.TestCase):
-    def test_soundfile(self):
-        import soundfile as sf
-        # floating point data is typically limited to the interval [-1.0, 1.0],
-        # but smaller/larger values are supported as well
-        data = np.array([[1.75, -1.75], [1.0, -1.0], [0.5, -0.5],
-                         [0.25, -0.25]])
-        file = 'test.wav'
-        sf.write(file, data, 44100, format='WAV', subtype='FLOAT')
-        read, fs = sf.read(file)
-        self.assertTrue(np.all(read == data))
-        self.assertEqual(fs, 44100)
-        os.remove(file)
-
-
-if __name__ == '__main__':
-    unittest.main()