Still don't get how to mock an imported library - Python












1















I've looked around but still don't get how to mock a library used inside a function and assert that its been called properly.



a.py

import win32clipboard

def copy():

win32clipboard.OpenClipboard()
win32clipboard.EmptyClipboard()
win32clipboard.SetClipboardText('dummy')
win32clipboard.CloseClipboard()


test_a.py



import a
import pytest

def test_copy():

# Mock win32clipboard somehow
# Run a.copy()

# assert mock win32clipboard.call_count == 4









share|improve this question



























    1















    I've looked around but still don't get how to mock a library used inside a function and assert that its been called properly.



    a.py

    import win32clipboard

    def copy():

    win32clipboard.OpenClipboard()
    win32clipboard.EmptyClipboard()
    win32clipboard.SetClipboardText('dummy')
    win32clipboard.CloseClipboard()


    test_a.py



    import a
    import pytest

    def test_copy():

    # Mock win32clipboard somehow
    # Run a.copy()

    # assert mock win32clipboard.call_count == 4









    share|improve this question

























      1












      1








      1








      I've looked around but still don't get how to mock a library used inside a function and assert that its been called properly.



      a.py

      import win32clipboard

      def copy():

      win32clipboard.OpenClipboard()
      win32clipboard.EmptyClipboard()
      win32clipboard.SetClipboardText('dummy')
      win32clipboard.CloseClipboard()


      test_a.py



      import a
      import pytest

      def test_copy():

      # Mock win32clipboard somehow
      # Run a.copy()

      # assert mock win32clipboard.call_count == 4









      share|improve this question














      I've looked around but still don't get how to mock a library used inside a function and assert that its been called properly.



      a.py

      import win32clipboard

      def copy():

      win32clipboard.OpenClipboard()
      win32clipboard.EmptyClipboard()
      win32clipboard.SetClipboardText('dummy')
      win32clipboard.CloseClipboard()


      test_a.py



      import a
      import pytest

      def test_copy():

      # Mock win32clipboard somehow
      # Run a.copy()

      # assert mock win32clipboard.call_count == 4






      python mocking pytest






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 4 '18 at 21:17









      curiousgeorgecuriousgeorge

      417




      417
























          1 Answer
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          1














          There is a mistake in your approach.



          win32clipboard is a library, with some classes and methods. You must mock every class from this library you want to use (OpenClipboard, EmptyClipboard, SetClipboardText and CloseClipboard)



          import a
          import pytest
          from unittest.mock import patch

          @patch('win32clipboard.OpenClipboard')
          @patch('win32clipboard.EmptyClipboard')
          @patch('win32clipboard.SetClipboardText')
          @patch('win32clipboard.CloseClipboard')
          def test_copy(mock_close, mock_set, mock_empty, mock_open):
          a.copy()

          assert mock_close.called
          assert mock_set.called
          assert mock_empty.called
          assert mock_open.called





          share|improve this answer



















          • 1





            I actually found out the answer to my own question here some time ago already but my post got deleted for not clarifying enough, apparently. I wasn't even aware since I never came back to check this thread but thanks for giving a perfect example (using decorators) for others to see how its done @MauroBaraldi!

            – curiousgeorge
            Nov 24 '18 at 21:36











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          1 Answer
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          1














          There is a mistake in your approach.



          win32clipboard is a library, with some classes and methods. You must mock every class from this library you want to use (OpenClipboard, EmptyClipboard, SetClipboardText and CloseClipboard)



          import a
          import pytest
          from unittest.mock import patch

          @patch('win32clipboard.OpenClipboard')
          @patch('win32clipboard.EmptyClipboard')
          @patch('win32clipboard.SetClipboardText')
          @patch('win32clipboard.CloseClipboard')
          def test_copy(mock_close, mock_set, mock_empty, mock_open):
          a.copy()

          assert mock_close.called
          assert mock_set.called
          assert mock_empty.called
          assert mock_open.called





          share|improve this answer



















          • 1





            I actually found out the answer to my own question here some time ago already but my post got deleted for not clarifying enough, apparently. I wasn't even aware since I never came back to check this thread but thanks for giving a perfect example (using decorators) for others to see how its done @MauroBaraldi!

            – curiousgeorge
            Nov 24 '18 at 21:36
















          1














          There is a mistake in your approach.



          win32clipboard is a library, with some classes and methods. You must mock every class from this library you want to use (OpenClipboard, EmptyClipboard, SetClipboardText and CloseClipboard)



          import a
          import pytest
          from unittest.mock import patch

          @patch('win32clipboard.OpenClipboard')
          @patch('win32clipboard.EmptyClipboard')
          @patch('win32clipboard.SetClipboardText')
          @patch('win32clipboard.CloseClipboard')
          def test_copy(mock_close, mock_set, mock_empty, mock_open):
          a.copy()

          assert mock_close.called
          assert mock_set.called
          assert mock_empty.called
          assert mock_open.called





          share|improve this answer



















          • 1





            I actually found out the answer to my own question here some time ago already but my post got deleted for not clarifying enough, apparently. I wasn't even aware since I never came back to check this thread but thanks for giving a perfect example (using decorators) for others to see how its done @MauroBaraldi!

            – curiousgeorge
            Nov 24 '18 at 21:36














          1












          1








          1







          There is a mistake in your approach.



          win32clipboard is a library, with some classes and methods. You must mock every class from this library you want to use (OpenClipboard, EmptyClipboard, SetClipboardText and CloseClipboard)



          import a
          import pytest
          from unittest.mock import patch

          @patch('win32clipboard.OpenClipboard')
          @patch('win32clipboard.EmptyClipboard')
          @patch('win32clipboard.SetClipboardText')
          @patch('win32clipboard.CloseClipboard')
          def test_copy(mock_close, mock_set, mock_empty, mock_open):
          a.copy()

          assert mock_close.called
          assert mock_set.called
          assert mock_empty.called
          assert mock_open.called





          share|improve this answer













          There is a mistake in your approach.



          win32clipboard is a library, with some classes and methods. You must mock every class from this library you want to use (OpenClipboard, EmptyClipboard, SetClipboardText and CloseClipboard)



          import a
          import pytest
          from unittest.mock import patch

          @patch('win32clipboard.OpenClipboard')
          @patch('win32clipboard.EmptyClipboard')
          @patch('win32clipboard.SetClipboardText')
          @patch('win32clipboard.CloseClipboard')
          def test_copy(mock_close, mock_set, mock_empty, mock_open):
          a.copy()

          assert mock_close.called
          assert mock_set.called
          assert mock_empty.called
          assert mock_open.called






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 23 '18 at 20:08









          Mauro BaraldiMauro Baraldi

          4,03112032




          4,03112032








          • 1





            I actually found out the answer to my own question here some time ago already but my post got deleted for not clarifying enough, apparently. I wasn't even aware since I never came back to check this thread but thanks for giving a perfect example (using decorators) for others to see how its done @MauroBaraldi!

            – curiousgeorge
            Nov 24 '18 at 21:36














          • 1





            I actually found out the answer to my own question here some time ago already but my post got deleted for not clarifying enough, apparently. I wasn't even aware since I never came back to check this thread but thanks for giving a perfect example (using decorators) for others to see how its done @MauroBaraldi!

            – curiousgeorge
            Nov 24 '18 at 21:36








          1




          1





          I actually found out the answer to my own question here some time ago already but my post got deleted for not clarifying enough, apparently. I wasn't even aware since I never came back to check this thread but thanks for giving a perfect example (using decorators) for others to see how its done @MauroBaraldi!

          – curiousgeorge
          Nov 24 '18 at 21:36





          I actually found out the answer to my own question here some time ago already but my post got deleted for not clarifying enough, apparently. I wasn't even aware since I never came back to check this thread but thanks for giving a perfect example (using decorators) for others to see how its done @MauroBaraldi!

          – curiousgeorge
          Nov 24 '18 at 21:36




















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