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cpython/Lib/test/test_fileinput.py

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'''
Tests for fileinput module.
Nick Mathewson
'''
import io
import os
import sys
import re
import fileinput
import collections
import builtins
import tempfile
import unittest
try:
import bz2
except ImportError:
bz2 = None
try:
import gzip
except ImportError:
gzip = None
from io import BytesIO, StringIO
from fileinput import FileInput, hook_encoded
from test.support import verbose
from test.support.os_helper import TESTFN, FakePath
from test.support.os_helper import unlink as safe_unlink
from test.support import os_helper
from test import support
from unittest import mock
# The fileinput module has 2 interfaces: the FileInput class which does
# all the work, and a few functions (input, etc.) that use a global _state
# variable.
class BaseTests:
# Write a content (str or bytes) to temp file, and return the
# temp file's name.
def writeTmp(self, content, *, mode='w'): # opening in text mode is the default
fd, name = tempfile.mkstemp()
self.addCleanup(os_helper.unlink, name)
encoding = None if "b" in mode else "utf-8"
with open(fd, mode, encoding=encoding) as f:
f.write(content)
return name
class LineReader:
def __init__(self):
self._linesread = []
@property
def linesread(self):
try:
return self._linesread[:]
finally:
self._linesread = []
def openhook(self, filename, mode):
self.it = iter(filename.splitlines(True))
return self
def readline(self, size=None):
line = next(self.it, '')
self._linesread.append(line)
return line
def readlines(self, hint=-1):
lines = []
size = 0
while True:
line = self.readline()
if not line:
return lines
lines.append(line)
size += len(line)
if size >= hint:
return lines
def close(self):
pass
class BufferSizesTests(BaseTests, unittest.TestCase):
def test_buffer_sizes(self):
t1 = self.writeTmp(''.join("Line %s of file 1\n" % (i+1) for i in range(15)))
t2 = self.writeTmp(''.join("Line %s of file 2\n" % (i+1) for i in range(10)))
t3 = self.writeTmp(''.join("Line %s of file 3\n" % (i+1) for i in range(5)))
t4 = self.writeTmp(''.join("Line %s of file 4\n" % (i+1) for i in range(1)))
pat = re.compile(r'LINE (\d+) OF FILE (\d+)')
if verbose:
print('1. Simple iteration')
fi = FileInput(files=(t1, t2, t3, t4), encoding="utf-8")
lines = list(fi)
fi.close()
self.assertEqual(len(lines), 31)
self.assertEqual(lines[4], 'Line 5 of file 1\n')
self.assertEqual(lines[30], 'Line 1 of file 4\n')
self.assertEqual(fi.lineno(), 31)
self.assertEqual(fi.filename(), t4)
if verbose:
print('2. Status variables')
fi = FileInput(files=(t1, t2, t3, t4), encoding="utf-8")
s = "x"
while s and s != 'Line 6 of file 2\n':
s = fi.readline()
self.assertEqual(fi.filename(), t2)
self.assertEqual(fi.lineno(), 21)
self.assertEqual(fi.filelineno(), 6)
self.assertFalse(fi.isfirstline())
self.assertFalse(fi.isstdin())
if verbose:
print('3. Nextfile')
fi.nextfile()
self.assertEqual(fi.readline(), 'Line 1 of file 3\n')
self.assertEqual(fi.lineno(), 22)
fi.close()
if verbose:
print('4. Stdin')
fi = FileInput(files=(t1, t2, t3, t4, '-'), encoding="utf-8")
savestdin = sys.stdin
try:
sys.stdin = StringIO("Line 1 of stdin\nLine 2 of stdin\n")
lines = list(fi)
self.assertEqual(len(lines), 33)
self.assertEqual(lines[32], 'Line 2 of stdin\n')
self.assertEqual(fi.filename(), '<stdin>')
fi.nextfile()
finally:
sys.stdin = savestdin
if verbose:
print('5. Boundary conditions')
fi = FileInput(files=(t1, t2, t3, t4), encoding="utf-8")
self.assertEqual(fi.lineno(), 0)
self.assertEqual(fi.filename(), None)
fi.nextfile()
self.assertEqual(fi.lineno(), 0)
self.assertEqual(fi.filename(), None)
if verbose:
print('6. Inplace')
savestdout = sys.stdout
try:
fi = FileInput(files=(t1, t2, t3, t4), inplace=True, encoding="utf-8")
for line in fi:
line = line[:-1].upper()
print(line)
fi.close()
finally:
sys.stdout = savestdout
fi = FileInput(files=(t1, t2, t3, t4), encoding="utf-8")
for line in fi:
self.assertEqual(line[-1], '\n')
m = pat.match(line[:-1])
self.assertNotEqual(m, None)
self.assertEqual(int(m.group(1)), fi.filelineno())
fi.close()
class UnconditionallyRaise:
def __init__(self, exception_type):
self.exception_type = exception_type
self.invoked = False
def __call__(self, *args, **kwargs):
self.invoked = True
raise self.exception_type()
class FileInputTests(BaseTests, unittest.TestCase):
def test_zero_byte_files(self):
t1 = self.writeTmp("")
t2 = self.writeTmp("")
t3 = self.writeTmp("The only line there is.\n")
t4 = self.writeTmp("")
fi = FileInput(files=(t1, t2, t3, t4), encoding="utf-8")
line = fi.readline()
self.assertEqual(line, 'The only line there is.\n')
self.assertEqual(fi.lineno(), 1)
self.assertEqual(fi.filelineno(), 1)
self.assertEqual(fi.filename(), t3)
line = fi.readline()
self.assertFalse(line)
self.assertEqual(fi.lineno(), 1)
self.assertEqual(fi.filelineno(), 0)
self.assertEqual(fi.filename(), t4)
fi.close()
def test_files_that_dont_end_with_newline(self):
t1 = self.writeTmp("A\nB\nC")
t2 = self.writeTmp("D\nE\nF")
fi = FileInput(files=(t1, t2), encoding="utf-8")
lines = list(fi)
self.assertEqual(lines, ["A\n", "B\n", "C", "D\n", "E\n", "F"])
self.assertEqual(fi.filelineno(), 3)
self.assertEqual(fi.lineno(), 6)
## def test_unicode_filenames(self):
## # XXX A unicode string is always returned by writeTmp.
## # So is this needed?
## t1 = self.writeTmp("A\nB")
## encoding = sys.getfilesystemencoding()
## if encoding is None:
## encoding = 'ascii'
## fi = FileInput(files=str(t1, encoding), encoding="utf-8")
## lines = list(fi)
## self.assertEqual(lines, ["A\n", "B"])
def test_fileno(self):
t1 = self.writeTmp("A\nB")
t2 = self.writeTmp("C\nD")
fi = FileInput(files=(t1, t2), encoding="utf-8")
self.assertEqual(fi.fileno(), -1)
line = next(fi)
self.assertNotEqual(fi.fileno(), -1)
fi.nextfile()
self.assertEqual(fi.fileno(), -1)
line = list(fi)
self.assertEqual(fi.fileno(), -1)
def test_invalid_opening_mode(self):
for mode in ('w', 'rU', 'U'):
with self.subTest(mode=mode):
with self.assertRaises(ValueError):
FileInput(mode=mode)
def test_stdin_binary_mode(self):
with mock.patch('sys.stdin') as m_stdin:
m_stdin.buffer = BytesIO(b'spam, bacon, sausage, and spam')
fi = FileInput(files=['-'], mode='rb')
lines = list(fi)
self.assertEqual(lines, [b'spam, bacon, sausage, and spam'])
def test_detached_stdin_binary_mode(self):
orig_stdin = sys.stdin
try:
sys.stdin = BytesIO(b'spam, bacon, sausage, and spam')
self.assertFalse(hasattr(sys.stdin, 'buffer'))
fi = FileInput(files=['-'], mode='rb')
lines = list(fi)
self.assertEqual(lines, [b'spam, bacon, sausage, and spam'])
finally:
sys.stdin = orig_stdin
def test_file_opening_hook(self):
try:
# cannot use openhook and inplace mode
fi = FileInput(inplace=True, openhook=lambda f, m: None)
self.fail("FileInput should raise if both inplace "
"and openhook arguments are given")
except ValueError:
pass
try:
fi = FileInput(openhook=1)
self.fail("FileInput should check openhook for being callable")
except ValueError:
pass
class CustomOpenHook:
def __init__(self):
self.invoked = False
def __call__(self, *args, **kargs):
self.invoked = True
return open(*args, encoding="utf-8")
t = self.writeTmp("\n")
custom_open_hook = CustomOpenHook()
with FileInput([t], openhook=custom_open_hook) as fi:
fi.readline()
self.assertTrue(custom_open_hook.invoked, "openhook not invoked")
def test_readline(self):
with open(TESTFN, 'wb') as f:
f.write(b'A\nB\r\nC\r')
# Fill TextIOWrapper buffer.
f.write(b'123456789\n' * 1000)
# Issue #20501: readline() shouldn't read whole file.
f.write(b'\x80')
self.addCleanup(safe_unlink, TESTFN)
with FileInput(files=TESTFN,
openhook=hook_encoded('ascii')) as fi:
try:
self.assertEqual(fi.readline(), 'A\n')
self.assertEqual(fi.readline(), 'B\n')
self.assertEqual(fi.readline(), 'C\n')
except UnicodeDecodeError:
self.fail('Read to end of file')
with self.assertRaises(UnicodeDecodeError):
# Read to the end of file.
list(fi)
self.assertEqual(fi.readline(), '')
self.assertEqual(fi.readline(), '')
def test_readline_binary_mode(self):
with open(TESTFN, 'wb') as f:
f.write(b'A\nB\r\nC\rD')
self.addCleanup(safe_unlink, TESTFN)
with FileInput(files=TESTFN, mode='rb') as fi:
self.assertEqual(fi.readline(), b'A\n')
self.assertEqual(fi.readline(), b'B\r\n')
self.assertEqual(fi.readline(), b'C\rD')
# Read to the end of file.
self.assertEqual(fi.readline(), b'')
self.assertEqual(fi.readline(), b'')
def test_inplace_binary_write_mode(self):
temp_file = self.writeTmp(b'Initial text.', mode='wb')
with FileInput(temp_file, mode='rb', inplace=True) as fobj:
line = fobj.readline()
self.assertEqual(line, b'Initial text.')
# print() cannot be used with files opened in binary mode.
sys.stdout.write(b'New line.')
with open(temp_file, 'rb') as f:
self.assertEqual(f.read(), b'New line.')
def test_inplace_encoding_errors(self):
temp_file = self.writeTmp(b'Initial text \x88', mode='wb')
with FileInput(temp_file, inplace=True,
encoding="ascii", errors="replace") as fobj:
line = fobj.readline()
self.assertEqual(line, 'Initial text \ufffd')
print("New line \x88")
with open(temp_file, 'rb') as f:
self.assertEqual(f.read().rstrip(b'\r\n'), b'New line ?')
def test_file_hook_backward_compatibility(self):
def old_hook(filename, mode):
return io.StringIO("I used to receive only filename and mode")
t = self.writeTmp("\n")
with FileInput([t], openhook=old_hook) as fi:
result = fi.readline()
self.assertEqual(result, "I used to receive only filename and mode")
def test_context_manager(self):
t1 = self.writeTmp("A\nB\nC")
t2 = self.writeTmp("D\nE\nF")
with FileInput(files=(t1, t2), encoding="utf-8") as fi:
lines = list(fi)
self.assertEqual(lines, ["A\n", "B\n", "C", "D\n", "E\n", "F"])
self.assertEqual(fi.filelineno(), 3)
self.assertEqual(fi.lineno(), 6)
self.assertEqual(fi._files, ())
def test_close_on_exception(self):
t1 = self.writeTmp("")
try:
with FileInput(files=t1, encoding="utf-8") as fi:
raise OSError
except OSError:
self.assertEqual(fi._files, ())
def test_empty_files_list_specified_to_constructor(self):
with FileInput(files=[], encoding="utf-8") as fi:
self.assertEqual(fi._files, ('-',))
def test_nextfile_oserror_deleting_backup(self):
"""Tests invoking FileInput.nextfile() when the attempt to delete
the backup file would raise OSError. This error is expected to be
silently ignored"""
os_unlink_orig = os.unlink
os_unlink_replacement = UnconditionallyRaise(OSError)
try:
t = self.writeTmp("\n")
self.addCleanup(safe_unlink, t + '.bak')
with FileInput(files=[t], inplace=True, encoding="utf-8") as fi:
next(fi) # make sure the file is opened
os.unlink = os_unlink_replacement
fi.nextfile()
finally:
os.unlink = os_unlink_orig
# sanity check to make sure that our test scenario was actually hit
self.assertTrue(os_unlink_replacement.invoked,
"os.unlink() was not invoked")
def test_readline_os_fstat_raises_OSError(self):
"""Tests invoking FileInput.readline() when os.fstat() raises OSError.
This exception should be silently discarded."""
os_fstat_orig = os.fstat
os_fstat_replacement = UnconditionallyRaise(OSError)
try:
t = self.writeTmp("\n")
with FileInput(files=[t], inplace=True, encoding="utf-8") as fi:
os.fstat = os_fstat_replacement
fi.readline()
finally:
os.fstat = os_fstat_orig
# sanity check to make sure that our test scenario was actually hit
self.assertTrue(os_fstat_replacement.invoked,
"os.fstat() was not invoked")
def test_readline_os_chmod_raises_OSError(self):
"""Tests invoking FileInput.readline() when os.chmod() raises OSError.
This exception should be silently discarded."""
os_chmod_orig = os.chmod
os_chmod_replacement = UnconditionallyRaise(OSError)
try:
t = self.writeTmp("\n")
with FileInput(files=[t], inplace=True, encoding="utf-8") as fi:
os.chmod = os_chmod_replacement
fi.readline()
finally:
os.chmod = os_chmod_orig
# sanity check to make sure that our test scenario was actually hit
self.assertTrue(os_chmod_replacement.invoked,
"os.fstat() was not invoked")
def test_fileno_when_ValueError_raised(self):
class FilenoRaisesValueError(UnconditionallyRaise):
def __init__(self):
UnconditionallyRaise.__init__(self, ValueError)
def fileno(self):
self.__call__()
unconditionally_raise_ValueError = FilenoRaisesValueError()
t = self.writeTmp("\n")
with FileInput(files=[t], encoding="utf-8") as fi:
file_backup = fi._file
try:
fi._file = unconditionally_raise_ValueError
result = fi.fileno()
finally:
fi._file = file_backup # make sure the file gets cleaned up
# sanity check to make sure that our test scenario was actually hit
self.assertTrue(unconditionally_raise_ValueError.invoked,
"_file.fileno() was not invoked")
self.assertEqual(result, -1, "fileno() should return -1")
def test_readline_buffering(self):
src = LineReader()
with FileInput(files=['line1\nline2', 'line3\n'],
openhook=src.openhook) as fi:
self.assertEqual(src.linesread, [])
self.assertEqual(fi.readline(), 'line1\n')
self.assertEqual(src.linesread, ['line1\n'])
self.assertEqual(fi.readline(), 'line2')
self.assertEqual(src.linesread, ['line2'])
self.assertEqual(fi.readline(), 'line3\n')
self.assertEqual(src.linesread, ['', 'line3\n'])
self.assertEqual(fi.readline(), '')
self.assertEqual(src.linesread, [''])
self.assertEqual(fi.readline(), '')
self.assertEqual(src.linesread, [])
def test_iteration_buffering(self):
src = LineReader()
with FileInput(files=['line1\nline2', 'line3\n'],
openhook=src.openhook) as fi:
self.assertEqual(src.linesread, [])
self.assertEqual(next(fi), 'line1\n')
self.assertEqual(src.linesread, ['line1\n'])
self.assertEqual(next(fi), 'line2')
self.assertEqual(src.linesread, ['line2'])
self.assertEqual(next(fi), 'line3\n')
self.assertEqual(src.linesread, ['', 'line3\n'])
self.assertRaises(StopIteration, next, fi)
self.assertEqual(src.linesread, [''])
self.assertRaises(StopIteration, next, fi)
self.assertEqual(src.linesread, [])
def test_pathlike_file(self):
t1 = FakePath(self.writeTmp("Path-like file."))
with FileInput(t1, encoding="utf-8") as fi:
line = fi.readline()
self.assertEqual(line, 'Path-like file.')
self.assertEqual(fi.lineno(), 1)
self.assertEqual(fi.filelineno(), 1)
self.assertEqual(fi.filename(), os.fspath(t1))
def test_pathlike_file_inplace(self):
t1 = FakePath(self.writeTmp('Path-like file.'))
with FileInput(t1, inplace=True, encoding="utf-8") as fi:
line = fi.readline()
self.assertEqual(line, 'Path-like file.')
print('Modified %s' % line)
with open(t1, encoding="utf-8") as f:
self.assertEqual(f.read(), 'Modified Path-like file.\n')
class MockFileInput:
"""A class that mocks out fileinput.FileInput for use during unit tests"""
def __init__(self, files=None, inplace=False, backup="", *,
mode="r", openhook=None, encoding=None, errors=None):
self.files = files
self.inplace = inplace
self.backup = backup
self.mode = mode
self.openhook = openhook
self.encoding = encoding
self.errors = errors
self._file = None
self.invocation_counts = collections.defaultdict(lambda: 0)
self.return_values = {}
def close(self):
self.invocation_counts["close"] += 1
def nextfile(self):
self.invocation_counts["nextfile"] += 1
return self.return_values["nextfile"]
def filename(self):
self.invocation_counts["filename"] += 1
return self.return_values["filename"]
def lineno(self):
self.invocation_counts["lineno"] += 1
return self.return_values["lineno"]
def filelineno(self):
self.invocation_counts["filelineno"] += 1
return self.return_values["filelineno"]
def fileno(self):
self.invocation_counts["fileno"] += 1
return self.return_values["fileno"]
def isfirstline(self):
self.invocation_counts["isfirstline"] += 1
return self.return_values["isfirstline"]
def isstdin(self):
self.invocation_counts["isstdin"] += 1
return self.return_values["isstdin"]
class BaseFileInputGlobalMethodsTest(unittest.TestCase):
"""Base class for unit tests for the global function of
the fileinput module."""
def setUp(self):
self._orig_state = fileinput._state
self._orig_FileInput = fileinput.FileInput
fileinput.FileInput = MockFileInput
def tearDown(self):
fileinput.FileInput = self._orig_FileInput
fileinput._state = self._orig_state
def assertExactlyOneInvocation(self, mock_file_input, method_name):
# assert that the method with the given name was invoked once
actual_count = mock_file_input.invocation_counts[method_name]
self.assertEqual(actual_count, 1, method_name)
# assert that no other unexpected methods were invoked
actual_total_count = len(mock_file_input.invocation_counts)
self.assertEqual(actual_total_count, 1)
class Test_fileinput_input(BaseFileInputGlobalMethodsTest):
"""Unit tests for fileinput.input()"""
def test_state_is_not_None_and_state_file_is_not_None(self):
"""Tests invoking fileinput.input() when fileinput._state is not None
and its _file attribute is also not None. Expect RuntimeError to
be raised with a meaningful error message and for fileinput._state
to *not* be modified."""
instance = MockFileInput()
instance._file = object()
fileinput._state = instance
with self.assertRaises(RuntimeError) as cm:
fileinput.input()
self.assertEqual(("input() already active",), cm.exception.args)
self.assertIs(instance, fileinput._state, "fileinput._state")
def test_state_is_not_None_and_state_file_is_None(self):
"""Tests invoking fileinput.input() when fileinput._state is not None
but its _file attribute *is* None. Expect it to create and return
a new fileinput.FileInput object with all method parameters passed
explicitly to the __init__() method; also ensure that
fileinput._state is set to the returned instance."""
instance = MockFileInput()
instance._file = None
fileinput._state = instance
self.do_test_call_input()
def test_state_is_None(self):
"""Tests invoking fileinput.input() when fileinput._state is None
Expect it to create and return a new fileinput.FileInput object
with all method parameters passed explicitly to the __init__()
method; also ensure that fileinput._state is set to the returned
instance."""
fileinput._state = None
self.do_test_call_input()
def do_test_call_input(self):
"""Tests that fileinput.input() creates a new fileinput.FileInput
object, passing the given parameters unmodified to
fileinput.FileInput.__init__(). Note that this test depends on the
monkey patching of fileinput.FileInput done by setUp()."""
files = object()
inplace = object()
backup = object()
mode = object()
openhook = object()
encoding = object()
# call fileinput.input() with different values for each argument
result = fileinput.input(files=files, inplace=inplace, backup=backup,
mode=mode, openhook=openhook, encoding=encoding)
# ensure fileinput._state was set to the returned object
self.assertIs(result, fileinput._state, "fileinput._state")
# ensure the parameters to fileinput.input() were passed directly
# to FileInput.__init__()
self.assertIs(files, result.files, "files")
self.assertIs(inplace, result.inplace, "inplace")
self.assertIs(backup, result.backup, "backup")
self.assertIs(mode, result.mode, "mode")
self.assertIs(openhook, result.openhook, "openhook")
class Test_fileinput_close(BaseFileInputGlobalMethodsTest):
"""Unit tests for fileinput.close()"""
def test_state_is_None(self):
"""Tests that fileinput.close() does nothing if fileinput._state
is None"""
fileinput._state = None
fileinput.close()
self.assertIsNone(fileinput._state)
def test_state_is_not_None(self):
"""Tests that fileinput.close() invokes close() on fileinput._state
and sets _state=None"""
instance = MockFileInput()
fileinput._state = instance
fileinput.close()
self.assertExactlyOneInvocation(instance, "close")
self.assertIsNone(fileinput._state)
class Test_fileinput_nextfile(BaseFileInputGlobalMethodsTest):
"""Unit tests for fileinput.nextfile()"""
def test_state_is_None(self):
"""Tests fileinput.nextfile() when fileinput._state is None.
Ensure that it raises RuntimeError with a meaningful error message
and does not modify fileinput._state"""
fileinput._state = None
with self.assertRaises(RuntimeError) as cm:
fileinput.nextfile()
self.assertEqual(("no active input()",), cm.exception.args)
self.assertIsNone(fileinput._state)
def test_state_is_not_None(self):
"""Tests fileinput.nextfile() when fileinput._state is not None.
Ensure that it invokes fileinput._state.nextfile() exactly once,
returns whatever it returns, and does not modify fileinput._state
to point to a different object."""
nextfile_retval = object()
instance = MockFileInput()
instance.return_values["nextfile"] = nextfile_retval
fileinput._state = instance
retval = fileinput.nextfile()
self.assertExactlyOneInvocation(instance, "nextfile")
self.assertIs(retval, nextfile_retval)
self.assertIs(fileinput._state, instance)
class Test_fileinput_filename(BaseFileInputGlobalMethodsTest):
"""Unit tests for fileinput.filename()"""
def test_state_is_None(self):
"""Tests fileinput.filename() when fileinput._state is None.
Ensure that it raises RuntimeError with a meaningful error message
and does not modify fileinput._state"""
fileinput._state = None
with self.assertRaises(RuntimeError) as cm:
fileinput.filename()
self.assertEqual(("no active input()",), cm.exception.args)
self.assertIsNone(fileinput._state)
def test_state_is_not_None(self):
"""Tests fileinput.filename() when fileinput._state is not None.
Ensure that it invokes fileinput._state.filename() exactly once,
returns whatever it returns, and does not modify fileinput._state
to point to a different object."""
filename_retval = object()
instance = MockFileInput()
instance.return_values["filename"] = filename_retval
fileinput._state = instance
retval = fileinput.filename()
self.assertExactlyOneInvocation(instance, "filename")
self.assertIs(retval, filename_retval)
self.assertIs(fileinput._state, instance)
class Test_fileinput_lineno(BaseFileInputGlobalMethodsTest):
"""Unit tests for fileinput.lineno()"""
def test_state_is_None(self):
"""Tests fileinput.lineno() when fileinput._state is None.
Ensure that it raises RuntimeError with a meaningful error message
and does not modify fileinput._state"""
fileinput._state = None
with self.assertRaises(RuntimeError) as cm:
fileinput.lineno()
self.assertEqual(("no active input()",), cm.exception.args)
self.assertIsNone(fileinput._state)
def test_state_is_not_None(self):
"""Tests fileinput.lineno() when fileinput._state is not None.
Ensure that it invokes fileinput._state.lineno() exactly once,
returns whatever it returns, and does not modify fileinput._state
to point to a different object."""
lineno_retval = object()
instance = MockFileInput()
instance.return_values["lineno"] = lineno_retval
fileinput._state = instance
retval = fileinput.lineno()
self.assertExactlyOneInvocation(instance, "lineno")
self.assertIs(retval, lineno_retval)
self.assertIs(fileinput._state, instance)
class Test_fileinput_filelineno(BaseFileInputGlobalMethodsTest):
"""Unit tests for fileinput.filelineno()"""
def test_state_is_None(self):
"""Tests fileinput.filelineno() when fileinput._state is None.
Ensure that it raises RuntimeError with a meaningful error message
and does not modify fileinput._state"""
fileinput._state = None
with self.assertRaises(RuntimeError) as cm:
fileinput.filelineno()
self.assertEqual(("no active input()",), cm.exception.args)
self.assertIsNone(fileinput._state)
def test_state_is_not_None(self):
"""Tests fileinput.filelineno() when fileinput._state is not None.
Ensure that it invokes fileinput._state.filelineno() exactly once,
returns whatever it returns, and does not modify fileinput._state
to point to a different object."""
filelineno_retval = object()
instance = MockFileInput()
instance.return_values["filelineno"] = filelineno_retval
fileinput._state = instance
retval = fileinput.filelineno()
self.assertExactlyOneInvocation(instance, "filelineno")
self.assertIs(retval, filelineno_retval)
self.assertIs(fileinput._state, instance)
class Test_fileinput_fileno(BaseFileInputGlobalMethodsTest):
"""Unit tests for fileinput.fileno()"""
def test_state_is_None(self):
"""Tests fileinput.fileno() when fileinput._state is None.
Ensure that it raises RuntimeError with a meaningful error message
and does not modify fileinput._state"""
fileinput._state = None
with self.assertRaises(RuntimeError) as cm:
fileinput.fileno()
self.assertEqual(("no active input()",), cm.exception.args)
self.assertIsNone(fileinput._state)
def test_state_is_not_None(self):
"""Tests fileinput.fileno() when fileinput._state is not None.
Ensure that it invokes fileinput._state.fileno() exactly once,
returns whatever it returns, and does not modify fileinput._state
to point to a different object."""
fileno_retval = object()
instance = MockFileInput()
instance.return_values["fileno"] = fileno_retval
instance.fileno_retval = fileno_retval
fileinput._state = instance
retval = fileinput.fileno()
self.assertExactlyOneInvocation(instance, "fileno")
self.assertIs(retval, fileno_retval)
self.assertIs(fileinput._state, instance)
class Test_fileinput_isfirstline(BaseFileInputGlobalMethodsTest):
"""Unit tests for fileinput.isfirstline()"""
def test_state_is_None(self):
"""Tests fileinput.isfirstline() when fileinput._state is None.
Ensure that it raises RuntimeError with a meaningful error message
and does not modify fileinput._state"""
fileinput._state = None
with self.assertRaises(RuntimeError) as cm:
fileinput.isfirstline()
self.assertEqual(("no active input()",), cm.exception.args)
self.assertIsNone(fileinput._state)
def test_state_is_not_None(self):
"""Tests fileinput.isfirstline() when fileinput._state is not None.
Ensure that it invokes fileinput._state.isfirstline() exactly once,
returns whatever it returns, and does not modify fileinput._state
to point to a different object."""
isfirstline_retval = object()
instance = MockFileInput()
instance.return_values["isfirstline"] = isfirstline_retval
fileinput._state = instance
retval = fileinput.isfirstline()
self.assertExactlyOneInvocation(instance, "isfirstline")
self.assertIs(retval, isfirstline_retval)
self.assertIs(fileinput._state, instance)
class Test_fileinput_isstdin(BaseFileInputGlobalMethodsTest):
"""Unit tests for fileinput.isstdin()"""
def test_state_is_None(self):
"""Tests fileinput.isstdin() when fileinput._state is None.
Ensure that it raises RuntimeError with a meaningful error message
and does not modify fileinput._state"""
fileinput._state = None
with self.assertRaises(RuntimeError) as cm:
fileinput.isstdin()
self.assertEqual(("no active input()",), cm.exception.args)
self.assertIsNone(fileinput._state)
def test_state_is_not_None(self):
"""Tests fileinput.isstdin() when fileinput._state is not None.
Ensure that it invokes fileinput._state.isstdin() exactly once,
returns whatever it returns, and does not modify fileinput._state
to point to a different object."""
isstdin_retval = object()
instance = MockFileInput()
instance.return_values["isstdin"] = isstdin_retval
fileinput._state = instance
retval = fileinput.isstdin()
self.assertExactlyOneInvocation(instance, "isstdin")
self.assertIs(retval, isstdin_retval)
self.assertIs(fileinput._state, instance)
class InvocationRecorder:
def __init__(self):
self.invocation_count = 0
def __call__(self, *args, **kwargs):
self.invocation_count += 1
self.last_invocation = (args, kwargs)
return io.BytesIO(b'some bytes')
class Test_hook_compressed(unittest.TestCase):
"""Unit tests for fileinput.hook_compressed()"""
def setUp(self):
self.fake_open = InvocationRecorder()
def test_empty_string(self):
self.do_test_use_builtin_open_text("", "r")
def test_no_ext(self):
self.do_test_use_builtin_open_text("abcd", "r")
@unittest.skipUnless(gzip, "Requires gzip and zlib")
def test_gz_ext_fake(self):
original_open = gzip.open
gzip.open = self.fake_open
try:
result = fileinput.hook_compressed("test.gz", "r")
finally:
gzip.open = original_open
self.assertEqual(self.fake_open.invocation_count, 1)
self.assertEqual(self.fake_open.last_invocation, (("test.gz", "r"), {}))
@unittest.skipUnless(gzip, "Requires gzip and zlib")
def test_gz_with_encoding_fake(self):
original_open = gzip.open
gzip.open = lambda filename, mode: io.BytesIO(b'Ex-binary string')
try:
result = fileinput.hook_compressed("test.gz", "r", encoding="utf-8")
finally:
gzip.open = original_open
self.assertEqual(list(result), ['Ex-binary string'])
@unittest.skipUnless(bz2, "Requires bz2")
def test_bz2_ext_fake(self):
original_open = bz2.BZ2File
bz2.BZ2File = self.fake_open
try:
result = fileinput.hook_compressed("test.bz2", "r")
finally:
bz2.BZ2File = original_open
self.assertEqual(self.fake_open.invocation_count, 1)
self.assertEqual(self.fake_open.last_invocation, (("test.bz2", "r"), {}))
def test_blah_ext(self):
self.do_test_use_builtin_open_binary("abcd.blah", "rb")
def test_gz_ext_builtin(self):
self.do_test_use_builtin_open_binary("abcd.Gz", "rb")
def test_bz2_ext_builtin(self):
self.do_test_use_builtin_open_binary("abcd.Bz2", "rb")
def test_binary_mode_encoding(self):
self.do_test_use_builtin_open_binary("abcd", "rb")
def test_text_mode_encoding(self):
self.do_test_use_builtin_open_text("abcd", "r")
def do_test_use_builtin_open_binary(self, filename, mode):
original_open = self.replace_builtin_open(self.fake_open)
try:
result = fileinput.hook_compressed(filename, mode)
finally:
self.replace_builtin_open(original_open)
self.assertEqual(self.fake_open.invocation_count, 1)
self.assertEqual(self.fake_open.last_invocation,
((filename, mode), {'encoding': None, 'errors': None}))
def do_test_use_builtin_open_text(self, filename, mode):
original_open = self.replace_builtin_open(self.fake_open)
try:
result = fileinput.hook_compressed(filename, mode)
finally:
self.replace_builtin_open(original_open)
self.assertEqual(self.fake_open.invocation_count, 1)
self.assertEqual(self.fake_open.last_invocation,
((filename, mode), {'encoding': 'locale', 'errors': None}))
@staticmethod
def replace_builtin_open(new_open_func):
original_open = builtins.open
builtins.open = new_open_func
return original_open
class Test_hook_encoded(unittest.TestCase):
"""Unit tests for fileinput.hook_encoded()"""
def test(self):
encoding = object()
errors = object()
result = fileinput.hook_encoded(encoding, errors=errors)
fake_open = InvocationRecorder()
original_open = builtins.open
builtins.open = fake_open
try:
filename = object()
mode = object()
open_result = result(filename, mode)
finally:
builtins.open = original_open
self.assertEqual(fake_open.invocation_count, 1)
args, kwargs = fake_open.last_invocation
self.assertIs(args[0], filename)
self.assertIs(args[1], mode)
self.assertIs(kwargs.pop('encoding'), encoding)
self.assertIs(kwargs.pop('errors'), errors)
self.assertFalse(kwargs)
def test_errors(self):
with open(TESTFN, 'wb') as f:
f.write(b'\x80abc')
self.addCleanup(safe_unlink, TESTFN)
def check(errors, expected_lines):
with FileInput(files=TESTFN, mode='r',
openhook=hook_encoded('utf-8', errors=errors)) as fi:
lines = list(fi)
self.assertEqual(lines, expected_lines)
check('ignore', ['abc'])
with self.assertRaises(UnicodeDecodeError):
check('strict', ['abc'])
check('replace', ['\ufffdabc'])
check('backslashreplace', ['\\x80abc'])
def test_modes(self):
with open(TESTFN, 'wb') as f:
# UTF-7 is a convenient, seldom used encoding
f.write(b'A\nB\r\nC\rD+IKw-')
self.addCleanup(safe_unlink, TESTFN)
def check(mode, expected_lines):
with FileInput(files=TESTFN, mode=mode,
openhook=hook_encoded('utf-7')) as fi:
lines = list(fi)
self.assertEqual(lines, expected_lines)
check('r', ['A\n', 'B\n', 'C\n', 'D\u20ac'])
with self.assertRaises(ValueError):
check('rb', ['A\n', 'B\r\n', 'C\r', 'D\u20ac'])
class MiscTest(unittest.TestCase):
def test_all(self):
support.check__all__(self, fileinput)
if __name__ == "__main__":
unittest.main()
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