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import pytest
import graphviz
from graphviz import parameters
VERIFY_FUNCS = [parameters.verify_engine,
parameters.verify_format,
parameters.verify_renderer,
parameters.verify_formatter]
@pytest.mark.parametrize(
'cls', [graphviz.Graph, graphviz.Digraph, graphviz.Source])
def test_parameters(cls, engine='patchwork', format='tiff',
renderer='map', formatter='core'):
args = [''] if cls is graphviz.Source else []
dot = cls(*args,
engine=engine, format=format,
renderer=renderer, formatter=formatter)
assert isinstance(dot, cls)
assert type(dot) is cls
assert dot.engine == engine
assert dot.format == format
assert dot.renderer == renderer
assert dot.formatter == formatter
dot_copy = dot.copy()
assert dot_copy is not dot
assert isinstance(dot_copy, cls)
assert type(dot_copy) is cls
assert dot.engine == engine
assert dot.format == format
assert dot_copy.renderer == renderer
assert dot_copy.formatter == formatter
@pytest.mark.parametrize(
'verify_func', VERIFY_FUNCS)
def test_verify_parameter_raises_unknown(verify_func):
with pytest.raises(ValueError, match=r'unknown .*\(must be .*one of'):
verify_func('Brian!')
@pytest.mark.parametrize(
'verify_func', VERIFY_FUNCS)
def test_verify_parameter_none_required_false_passes(verify_func):
assert verify_func(None, required=False) is None
@pytest.mark.parametrize(
'verify_func', VERIFY_FUNCS)
def test_verify_parameter_none_required_raises_missing(verify_func):
with pytest.raises(ValueError, match=r'missing'):
verify_func(None, required=True)
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