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