summaryrefslogtreecommitdiffstats
path: root/Lib/test/test_linecache.py
blob: 7d14534d35bdc5755e371241e8127ecc63cca6f4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
""" 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(support.__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_main():
    support.run_unittest(LineCacheTests)

if __name__ == "__main__":
    test_main()