def test_differ_assert_passes():
image1 = LivePillowImage(Image.new('RGBA', (10, 20)))
image2 = LivePillowImage(Image.new('RGBA', (10, 20)))
differ = LiveImageDiffer()
differ.assert_equal(image1, image2)
def test_differ_compare_test_name_without_path():
image1 = LivePillowImage(Image.new('RGBA', (10, 20)))
differ = LiveImageDiffer()
with pytest.raises(ValueError,
match=r'Used file_prefix without diffs_path\.'):
differ.compare(image1, image1, 'test_name')
def test_differ_compare_writes_no_files_without_file_prefix(tmp_path):
image1 = LivePillowImage(Image.new('RGBA', (10, 20)))
image1.set_pixel((5, 10), (0, 255, 0, 255))
image2 = LivePillowImage(Image.new('RGBA', (10, 20)))
diffs_path = tmp_path / 'image_diffs'
differ = LiveImageDiffer(diffs_path)
differ.compare(image1, image2)
assert list(diffs_path.iterdir()) == []
def test_differ_assert_fails():
blue = (0, 0, 255, 255)
image1 = LivePillowImage(Image.new('RGBA', (10, 20)))
image1.set_pixel((5, 10), blue)
image2 = LivePillowImage(Image.new('RGBA', (10, 20)))
differ = LiveImageDiffer()
with pytest.raises(AssertionError, match=r'Images differ by 1 pixel.'):
differ.assert_equal(image1, image2)
def test_differ_compare_uses_test_name(tmp_path, request):
image1 = LivePillowImage(Image.new('RGBA', (10, 20)))
image1.set_pixel((5, 10), (0, 0, 123, 255))
image2 = LivePillowImage(Image.new('RGBA', (10, 20)))
diffs_path = tmp_path / 'image_diffs'
actual_path = (diffs_path / 'test-PySrc-tests-test_live_image-py--'
'test_differ_compare_uses_test_name-actual.png')
differ = LiveImageDiffer(diffs_path, request)
differ.compare(image1, image2)
assert actual_path.exists()
def test_differ_compare_display(patched_turtle):
expected_report = """\
create_text
-1
20
anchor='sw'
fill='black'
font=('Arial', 10, 'normal')
text='Actual'
create_image
0
20
image='...'
create_text
-1
60
anchor='sw'
fill='black'
font=('Arial', 10, 'normal')
text='Diff (0 pixels)'
create_image
0
60
image='...'
create_text
-1
100
anchor='sw'
fill='black'
font=('Arial', 10, 'normal')
text='Expected'
create_image
0
100
image='...'
"""
t = MockTurtle()
image1 = LivePillowImage(Image.new('RGBA', (10, 20)))
image2 = LivePillowImage(Image.new('RGBA', (10, 20)))
differ = LiveImageDiffer()
differ.compare(image1, image2)
report = t.report
assert replace_image(report) == expected_report
def test_differ_compare_display_disabled(patched_turtle):
expected_report = '\n'
t = MockTurtle()
image1 = LivePillowImage(Image.new('RGBA', (10, 20)))
image2 = LivePillowImage(Image.new('RGBA', (10, 20)))
differ = LiveImageDiffer(is_displayed=False)
differ.compare(image1, image2)
report = t.report
assert replace_image(report) == expected_report
def test_differ_compare_writes_file(tmp_path):
image1 = LivePillowImage(Image.new('RGBA', (10, 20)))
image1.set_pixel((5, 10), (0, 0, 255, 255))
image2 = LivePillowImage(Image.new('RGBA', (10, 20)))
diffs_path = tmp_path / 'image_diffs'
actual_path = diffs_path / 'test_name-actual.png'
diff_path = diffs_path / 'test_name-diff.png'
expected_path = diffs_path / 'test_name-expected.png'
differ = LiveImageDiffer(diffs_path)
differ.compare(image1, image2, 'test_name')
assert actual_path.exists()
assert diff_path.exists()
assert expected_path.exists()
def test_live_png_as_painter(tmp_path):
blue = (0, 0, 255, 255)
white = (255, 255, 255, 255)
image1 = LivePillowImage(Image.new('RGBA', (10, 20)))
image1.set_pixel((5, 10), blue)
image1.set_pixel((6, 10), white)
image2 = LivePillowImage(Image.new('RGBA', (10, 20)))
image2.set_pixel((5, 10), blue)
bytes2 = image2.convert_to_png()
image3 = LivePng(bytes2)
painter3 = image3.convert_to_painter()
painter3.set_pixel((6, 10), white)
differ = LiveImageDiffer(tmp_path)
differ.assert_equal(image1, painter3, 'live_png_as_painter')
def test_differ_compare_two_sizes():
blue = (0, 0, 255, 255)
green = (0, 255, 0, 255)
missing_blue = (255, 0, 51, 255)
missing_green = (255, 51, 0, 255)
image1 = LivePillowImage(Image.new('RGBA', (2, 3)))
image1.set_pixel((0, 2), blue)
image2 = LivePillowImage(Image.new('RGBA', (3, 2)))
image2.set_pixel((2, 0), green)
differ = LiveImageDiffer()
diff = differ.compare(image1, image2).convert_to_painter()
diff_pixel1 = diff.get_pixel((0, 2))
diff_pixel2 = diff.get_pixel((2, 0))
assert diff_pixel1 == missing_blue
assert diff_pixel2 == missing_green
assert differ.diff_count == 5
def test_differ_cleans_diffs_path(tmp_path):
diffs_path = tmp_path / 'image_diffs'
diffs_path.mkdir()
leftover_path = diffs_path / 'leftover-actual.png'
leftover_path.write_text('garbage')
unrelated_path = diffs_path / 'leftover-unrelated.png'
unrelated_path.write_text('garbage')
LiveImageDiffer(diffs_path)
assert unrelated_path.exists()
assert not leftover_path.exists()
def test_differ_remove_no_prefix(tmp_path):
image1 = LivePillowImage(Image.new('RGBA', (10, 20)))
image1.set_pixel((5, 10), (0, 0, 101, 255))
image2 = LivePillowImage(Image.new('RGBA', (10, 20)))
diffs_path = tmp_path / 'image_diffs'
actual_path1 = diffs_path / 'apple-actual.png'
actual_path2 = diffs_path / 'banana-actual.png'
differ = LiveImageDiffer(diffs_path)
differ.compare(image1, image2, 'apple')
differ.compare(image1, image2, 'banana')
differ.remove_common_prefix()
assert actual_path1.exists()
assert actual_path2.exists()
def test_differ_compare():
blue = (0, 0, 255, 255)
white = (255, 255, 255, 255)
expected_match = (0, 0, 255, 255 // 3)
expected_diff = (255, 255 // 5, 255 * 2 // 5, 255)
image1 = LivePillowImage(Image.new('RGBA', (10, 20)))
image1.set_pixel((5, 10), blue)
image1.set_pixel((6, 10), blue)
image2 = LivePillowImage(Image.new('RGBA', (10, 20)))
image2.set_pixel((5, 10), blue)
image2.set_pixel((6, 10), white)
differ = LiveImageDiffer()
diff = differ.compare(image1, image2).convert_to_painter()
diff_pixel1 = diff.get_pixel((5, 10))
diff_pixel2 = diff.get_pixel((6, 10))
assert diff_pixel1 == expected_match
assert diff_pixel2 == expected_diff
assert differ.diff_count == 1
def test_differ_duplicate_file_prefix(tmp_path):
image = LivePillowImage(Image.new('RGBA', (10, 20)))
differ = LiveImageDiffer(tmp_path)
differ.compare(image, image, 'first_test')
differ.compare(image, image, 'other_test')
with pytest.raises(ValueError,
match=r"Duplicate file_prefix: 'first_test'\."):
differ.compare(image, image, 'first_test')
def test_differ_compare_two_sets(tmp_path):
image1 = LivePillowImage(Image.new('RGBA', (10, 20)))
image1.set_pixel((5, 10), (0, 0, 100, 255))
image2 = LivePillowImage(Image.new('RGBA', (10, 20)))
diffs_path = tmp_path / 'image_diffs'
actual_path1 = diffs_path / 'test_name-actual.png'
actual_path2 = diffs_path / 'other_name-actual.png'
differ = LiveImageDiffer(diffs_path)
differ.compare(image1, image2, 'test_name')
differ.compare(image1, image2, 'other_name')
assert actual_path1.exists()
assert actual_path2.exists()
