def test_module_context():
code = '''
from sys import stdin
from os.path import dirname
from a.b.c.d import e
'''
module_node = parse(code)
import_nodes = extract_import_node(module_node)
module_context = ModuleContext(import_nodes)
assert 'stdin' in module_context.ns
assert 'dirname' in module_context.ns
assert 'e' in module_context.ns
assert module_context.ns['e'].path == 'a.b.c.d.e'
def test_extract_import():
code = '''
import foo.bar
def foo():
def bar():
from modulename import funcname as func
'''
import_nodes = list(extract_import_node(parse(code)))
#
assert len(import_nodes) == 2
assert import_nodes[0].names[0].name == 'foo.bar'
assert import_nodes[0].names[0].asname is None
assert import_nodes[1].module == 'modulename'
assert import_nodes[1].names[0].name == 'funcname'
assert import_nodes[1].names[0].asname == 'func'
def test_extract_attr():
code = '''
import sys
sys.stdin.write('hello, world!\\n')
'''
module_node = parse(code)
import_nodes = extract_import_node(module_node)
module_context = ModuleContext(import_nodes)
attr_nodes = extract_attr_or_name_node(module_node)
accessors = itertools.ifilter(bool, itertools.imap(module_context.access,
attr_nodes))
module_accessors = list(itertools.imap(operator.attrgetter('path'),
accessors))
assert 'sys.stdin' in module_accessors
assert 'sys.stdin.write' in module_accessors