Source code for test_exif_lib

"""
This module contains unit tests for the MetaImage class in the exif_lib module.
The tests verify the functionality of modifying, reading, and clearing comments
in image metadata using the MetaImage class.
"""

from exif_lib import MetaImage
import unittest




class TestExivlib(unittest.TestCase):
    """
    Unit tests for the MetaImage class to ensure correct functionality of
    modifying, reading, and clearing image comments.

    Attributes:
        comment (str): The comment to be used in tests for modifying and reading image comments.
    """

    comment = "Raspi"



    def test_modify_comment(self):
        """
        Test the modify_comment method of MetaImage.

        This test initializes a MetaImage object with a sample image, modifies the comment
        in the image metadata, and asserts that the comment was modified correctly.
        """
        img = MetaImage("../SourceImage/image.jpg")
        img.modify_comment(self.comment)
        self.assertEqual(img.read_comment(), self.comment)




    def test_read_comment(self):
        """
        Test the read_comment method of MetaImage.

        This test initializes a MetaImage object with a sample image and asserts that the
        comment read from the image metadata matches the expected comment.
        """
        img = MetaImage("../SourceImage/image.jpg")
        self.assertEqual(img.read_comment(), self.comment)




    def test_clear_comment(self):
        """
        Test the clear_comment method of MetaImage.

        This test initializes a MetaImage object with a sample image, clears the comment
        in the image metadata, and asserts that the comment was cleared (returns None).
        """
        img = MetaImage("../SourceImage/image.jpg")
        self.assertEqual(img.clear_comment(), None)




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