from test.test_support import TESTFN, run_unittest
import os
import wave
import unittest

WAVE_TYPE_PARMS=dict(
    NONE=dict(nchannels = 2, sampwidth = 2, framerate = 8000, nframes = 100, comptype = 'NONE'),
    ULAW=dict(nchannels = 1, sampwidth = 1, framerate = 8000, nframes = 100, comptype = 'ULAW'),
    ALAW=dict(nchannels = 2, sampwidth = 1, framerate = 8000, nframes = 100, comptype = 'ALAW')
)

class TestWave(unittest.TestCase):

    def setUp(self):
        self.f = None

    def tearDown(self):
        if self.f is not None:
            self.f.close()
        try:
            os.remove(TESTFN)
        except OSError:
            pass

    def test_pcm(self):
        self._test_type('NONE')

    def test_ulaw(self):
        self._test_type('ULAW')

    def test_alaw(self):
        self._test_type('ALAW')
        
    def _test_type(self, ctype):
        nchannels = WAVE_TYPE_PARMS[ctype]['nchannels']
        sampwidth = WAVE_TYPE_PARMS[ctype]['sampwidth']
        framerate = WAVE_TYPE_PARMS[ctype]['framerate']
        nframes = WAVE_TYPE_PARMS[ctype]['nframes']
        comptype = WAVE_TYPE_PARMS[ctype]['comptype']

        self.f = wave.open(TESTFN, 'wb')
        self.f.setnchannels(nchannels)
        self.f.setsampwidth(sampwidth)
        self.f.setframerate(framerate)
        self.f.setnframes(nframes)
        self.f.setcomptype(comptype, '')
        output = '\0' * nframes * nchannels * sampwidth
        self.f.writeframes(output)
        self.f.close()

        self.f = wave.open(TESTFN, 'rb')
        self.assertEqual(nchannels, self.f.getnchannels())
        self.assertEqual(sampwidth, self.f.getsampwidth())
        self.assertEqual(framerate, self.f.getframerate())
        self.assertEqual(comptype, self.f.getcomptype())
        self.assertEqual(nframes, self.f.getnframes())
        self.assertEqual(self.f.readframes(nframes), output)

def test_main():
    run_unittest(TestWave)

if __name__ == '__main__':
    test_main()