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"""
Verify evaluation of BIND expressions of different types. See
<http://www.w3.org/TR/sparql11-query/#rExpression>.
"""
from rdflib import Graph, URIRef, Literal, Variable
def test_bind():
base = "http://example.org/"
g = Graph()
g.add((URIRef(
base + "thing"), URIRef(base + "ns#comment"), Literal("anything")))
def check(expr, var, obj):
r = g.query("""
prefix : <http://example.org/ns#>
select * where { ?s ?p ?o . %s } """ % expr)
assert r.bindings[0][Variable(var)] == obj
yield (check, 'bind("thing" as ?name)', 'name', Literal("thing"))
yield (check, 'bind(<http://example.org/other> as ?other)', 'other',
URIRef("http://example.org/other"))
yield (check, "bind(:Thing as ?type)", 'type',
URIRef("http://example.org/ns#Thing"))
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