matplotlib example real example test buffer (snippet)

Python matplotlib example 'real example test buffer'

Modules used in program:

import mock
import unittest
import matplotlib.pyplot
import io

python real example test buffer

Python matplotlib example: real example test buffer

import io
import matplotlib.pyplot

import unittest
import mock
from mock import mock_open, patch, MagicMock, Mock


class BufferMatplotlib(object):
    def __init__(self):
        self.buffer = io.BytesIO()
        self.buffers = []

    def append_plt(self, plt, name, extension):
        plt.savefig(self.buffer, format=extension)
        self.buffer.seek(0)
        d = {'buffer':self.buffer, 'name':name, 'extension':extension}
        self.buffers.append(d)
        plt.close()
        self.buffer = io.BytesIO()

    def save_buffers(self, path):
        for buf in self.buffers:
            name_extension = buf['name'] + '.' + buf['extension']
            full_path = os.path.join(path, name_extension)

            with open(full_path, 'wb') as f:
                f.write(buf['buffer'].getvalue())


class TestBufferMatplotlib(unittest.TestCase):

    def test_append_plt(self):
        buf = BufferMatplotlib()        

        with patch('matplotlib.pyplot') as my_mocked_plot:
            buf.append_plt(my_mocked_plot, name='name1', extension='png')

        self.assertTrue(len(buf.buffers) == 1)

        for i in range(10):
            with patch('matplotlib.pyplot') as my_mocked_plot:
                buf.append_plt(my_mocked_plot, name='n' + str(i), extension='png')

        self.assertTrue(len(buf.buffers) == 11)


    def test_save_buffers(self):
        pass


if __name__ == '__main__':
    unittest.main()

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