from helper import unittest, PillowTestCase

from PIL import FitsStubImagePlugin, Image

TEST_FILE = "Tests/images/hopper.fits"


class TestFileFitsStub(PillowTestCase):

    def test_open(self):
        # Act
        im = Image.open(TEST_FILE)

        # Assert
        self.assertEqual(im.format, "FITS")

        # Dummy data from the stub
        self.assertEqual(im.mode, "F")
        self.assertEqual(im.size, (1, 1))

    def test_invalid_file(self):
        # Arrange
        invalid_file = "Tests/images/flower.jpg"

        # Act / Assert
        self.assertRaises(SyntaxError,
                          lambda:
                          FitsStubImagePlugin.FITSStubImageFile(invalid_file))

    def test_load(self):
        # Arrange
        im = Image.open(TEST_FILE)

        # Act / Assert: stub cannot load without an implemented handler
        self.assertRaises(IOError, im.load)

    def test_save(self):
        # Arrange
        im = Image.open(TEST_FILE)
        dummy_fp = None
        dummy_filename = "dummy.filename"

        # Act / Assert: stub cannot save without an implemented handler
        self.assertRaises(IOError, lambda: im.save(dummy_filename))
        self.assertRaises(
            IOError,
            lambda: FitsStubImagePlugin._save(im, dummy_fp, dummy_filename))


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