def test_greyscale():
'''
Check if the greyscale function could get the expected image
'''
greyscale("tests/images/sample.png", "tests/images/sample.png")
output = skimage.io.imread("tests/images/sample.png")
test_output = skimage.io.imread("tests/images/sample.png")
assert np.array_equal(output, test_output), \
"The greyscale function does not work properly"
def test_nonexistent_output_path():
'''
Check unexpected greyscale function input for output
'''
with pytest.raises(FileNotFoundError):
greyscale("imageprocessor/tests/images/sample.png", "./123/456.png")
def test_nonexistent_input_path():
'''
Check unexpected greyscale function for input path
'''
with pytest.raises(FileNotFoundError):
greyscale("./123/456.png", "tests/images/sample.png")
def test_non_string_output():
'''
Check unexpected rotating function for output path format
'''
with pytest.raises(AttributeError):
greyscale(0, 555)
def test_non_string_input():
'''
Check unexpected greyscale function input
'''
with pytest.raises(AttributeError):
greyscale(555, 0)