""" Tests for the linecache module """
import linecache
import unittest
import os.path
from test import support
FILENAME = linecache.__file__
INVALID_NAME = '!@$)(!@#_1'
EMPTY = ''
TESTS = 'inspect_fodder inspect_fodder2 mapping_tests'
TESTS = TESTS.split()
TEST_PATH = os.path.dirname(__file__)
MODULES = "linecache abc".split()
MODULE_PATH = os.path.dirname(FILENAME)
SOURCE_1 = '''
" Docstring "
def function():
return result
'''
SOURCE_2 = '''
def f():
return 1 + 1
a = f()
'''
SOURCE_3 = '''
def f():
return 3''' # No ending newline
class LineCacheTests(unittest.TestCase):
def test_getline(self):
getline = linecache.getline
# Bad values for line number should return an empty string
self.assertEqual(getline(FILENAME, 2**15), EMPTY)
self.assertEqual(getline(FILENAME, -1), EMPTY)
# Float values currently raise TypeError, should it?
self.assertRaises(TypeError, getline, FILENAME, 1.1)
# Bad filenames should return an empty string
self.assertEqual(getline(EMPTY, 1), EMPTY)
self.assertEqual(getline(INVALID_NAME, 1), EMPTY)
# Check whether lines correspond to those from file iteration
for entry in TESTS:
filename = os.path.join(TEST_PATH, entry) + '.py'
with open(filename) as file:
for index, line in enumerate(file):
self.assertEqual(line, getline(filename, index + 1))
# Check module loading
for entry in MODULES:
filename = os.path.join(MODULE_PATH, entry) + '.py'
with open(filename) as file:
for index, line in enumerate(file):
self.assertEqual(line, getline(filename, index + 1))
# Check that bogus data isn't returned (issue #1309567)
empty = linecache.getlines('a/b/c/__init__.py')
self.assertEqual(empty, [])
def test_no_ending_newline(self):
self.addCleanup(support.unlink, support.TESTFN)
with open(support.TESTFN, "w") as fp:
fp.write(SOURCE_3)
lines = linecache.getlines(support.TESTFN)
self.assertEqual(lines, ["\n", "def f():\n", " return 3\n"])
def test_clearcache(self):
cached = []
for entry in TESTS:
filename = os.path.join(TEST_PATH, entry) + '.py'
cached.append(filename)
linecache.getline(filename, 1)
# Are all files cached?
cached_empty = [fn for fn in cached if fn not in linecache.cache]
self.assertEqual(cached_empty, [])
# Can we clear the cache?
linecache.clearcache()
cached_empty = [fn for fn in cached if fn in linecache.cache]
self.assertEqual(cached_empty, [])
def test_checkcache(self):
getline = linecache.getline
# Create a source file and cache its contents
source_name = support.TESTFN + '.py'
self.addCleanup(support.unlink, source_name)
with open(source_name, 'w') as source:
source.write(SOURCE_1)
getline(source_name, 1)
# Keep a copy of the old contents
source_list = []
with open(source_name) as source:
for index, line in enumerate(source):
self.assertEqual(line, getline(source_name, index + 1))
source_list.append(line)
with open(source_name, 'w') as source:
source.write(SOURCE_2)
# Try to update a bogus cache entry
linecache.checkcache('dummy')
# Check that the cache matches the old contents
for index, line in enumerate(source_list):
self.assertEqual(line, getline(source_name, index + 1))
# Update the cache and check whether it matches the new source file
linecache.checkcache(source_name)
with open(source_name) as source:
for index, line in enumerate(source):
self.assertEqual(line, getline(source_name, index + 1))
source_list.append(line)
def test_memoryerror(self):
lines = linecache.getlines(FILENAME)
self.assertTrue(lines)
def raise_memoryerror(*args, **kwargs):
raise MemoryError
with support.swap_attr(linecache, 'updatecache', raise_memoryerror):
lines2 = linecache.getlines(FILENAME)
self.assertEqual(lines2, lines)
linecache.clearcache()
with support.swap_attr(linecache, 'updatecache', raise_memoryerror):
lines3 = linecache.getlines(FILENAME)
self.assertEqual(lines3, [])
self.assertEqual(linecache.getlines(FILENAME), lines)
if __name__ == "__main__":
unittest.main()