def test_write_instance(self):
"""
The write_instance method serializes a component instance
correctly.
"""
inst = ComponentInstance('id', 'libid', 1)
inst.add_symbol_attribute(SymbolAttribute(3, 4, 0.5))
writer = KiCAD()
buf = StringIO()
writer.write_instance(buf, inst)
self.assertEqual(buf.getvalue(), '''\
$Comp
L libid id
U 1 1 00000000
P 33 -44
\t1 33 -44
\t0 1 1 0
$EndComp
''')
