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import base64
import os
import pytest
from _plotly_utils.basevalidators import ImageUriValidator
from PIL import Image
# Fixtures
# --------
@pytest.fixture()
def validator():
return ImageUriValidator("prop", "parent")
# Tests
# -----
# ### Acceptance ###
@pytest.mark.parametrize(
"val",
[
"http://somewhere.com/images/image12.png",
"data:image/png;base64,iVBORw0KGgoAAAANSU",
],
)
def test_validator_acceptance(val, validator):
assert validator.validate_coerce(val) == val
# ### Coercion from PIL Image ###
def test_validator_coercion_PIL(validator):
# Single pixel black png (http://png-pixel.com/)
tests_dir = os.path.dirname(os.path.dirname(__file__))
img_path = os.path.join(tests_dir, "resources", "1x1-black.png")
with open(img_path, "rb") as f:
hex_bytes = base64.b64encode(f.read()).decode("ascii")
expected_uri = "data:image/png;base64," + hex_bytes
img = Image.open(img_path)
coerce_val = validator.validate_coerce(img)
assert coerce_val == expected_uri
# ### Rejection ###
@pytest.mark.parametrize("val", [23, set(), []])
def test_rejection_by_type(val, validator):
with pytest.raises(ValueError) as validation_failure:
validator.validate_coerce(val)
assert "Invalid value" in str(validation_failure.value)
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