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error message:

(test_env) oliskir@svalbard:~/src/meridian/sound_classification$ pytest
================================================================================ test session starts =================================================================================
platform linux -- Python 3.6.5, pytest-3.6.2, py-1.5.4, pluggy-0.6.0
rootdir: /home/oliskir/src/meridian/sound_classification, inifile:
collected 1 item

sound_classification/tests/test_pre_processing.py E                                                                                                                            [100%]

======================================================================================= ERRORS =======================================================================================
___________________________________________________________________ ERROR at setup of test_standardize_sample_rate ___________________________________________________________________

sine_wave = (44100, array([   0.        ,   92.89413325,  185.78751222, ..., -278.67938265,
       -185.78751223,  -92.89413325]))

    @pytest.fixture
    def sine_wave_file(sine_wave):
        """Create a .wav with the 'sine_wave()' fixture

           The file is saved as ./assets/sine_wave.wav.
           When the tests using this fixture are done,
           the file is deleted.


           Yields:
                wav_file : str
                    A string containing the path to the .wav file.
        """
        wav_file = "./assets/sine_wave.wav"
        rate, sig = sine_wave
>       pp.wave.write(wav_file, rate=rate, data=sig)

sound_classification/tests/test_pre_processing.py:73:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

filename = './assets/sine_wave.wav', rate = 44100, data = array([   0.        ,   92.89413325,  185.78751222, ..., -278.67938265,
       -185.78751223,  -92.89413325])

    def write(filename, rate, data):
        """
        Write a numpy array as a WAV file.

        Parameters
        ----------
        filename : string or open file handle
            Output wav file.
        rate : int
            The sample rate (in samples/sec).
        data : ndarray
            A 1-D or 2-D numpy array of either integer or float data-type.

        Notes
        -----
        * Writes a simple uncompressed WAV file.
        * To write multiple-channels, use a 2-D array of shape
          (Nsamples, Nchannels).
        * The bits-per-sample and PCM/float will be determined by the data-type.

        Common data types: [1]_

        =====================  ===========  ===========  =============
             WAV format            Min          Max       NumPy dtype
        =====================  ===========  ===========  =============
        32-bit floating-point  -1.0         +1.0         float32
        32-bit PCM             -2147483648  +2147483647  int32
        16-bit PCM             -32768       +32767       int16
        8-bit PCM              0            255          uint8
        =====================  ===========  ===========  =============

        Note that 8-bit PCM is unsigned.

        References
        ----------
        .. [1] IBM Corporation and Microsoft Corporation, "Multimedia Programming
           Interface and Data Specifications 1.0", section "Data Format of the
           Samples", August 1991
           http://www.tactilemedia.com/info/MCI_Control_Info.html

        """
        if hasattr(filename, 'write'):
            fid = filename
        else:
>           fid = open(filename, 'wb')
E           FileNotFoundError: [Errno 2] No such file or directory: './assets/sine_wave.wav'

../../../test_env/lib/python3.6/site-packages/scipy/io/wavfile.py:328: FileNotFoundError
============================================================================== 1 error in 0.24 seconds ===============================================================================