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# test for https://github.com/RDFLib/rdflib/issues/579
from rdflib import Graph, URIRef, Literal, Namespace
from rdflib.namespace import FOAF, RDF
def test_issue579():
g = Graph()
g.bind("foaf", FOAF)
n = Namespace("http://myname/")
g.add((n.bob, FOAF.name, Literal("bb")))
# query is successful.
assert len(g.query("select ?n where { ?n foaf:name 'bb' . }")) == 1
# update is not.
g.update("delete where { ?e foaf:name 'ss' .}")
assert len(g) == 1
g.update("delete where { ?e foaf:name 'bb' .}")
assert len(g) == 0
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