def test_reads_only_from_start_to_end(self, data, testfile):
with testfile.open() as f:
assert Subfile(f, 2, 6).read() == data[2:6]
with testfile.open() as f:
assert Subfile(f, 2, 6).read(8) == data[2:6]
with testfile.open() as f:
assert Subfile(f, 2, 6).readline() == data[2:6]
with testfile.open() as f:
assert Subfile(f, 2, 6).readline(8) == data[2:6]
def test_seek_after_end(self, testfile):
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.seek(8)
assert sf.read() == ""
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.read(1)
sf.seek(8, os.SEEK_CUR)
assert sf.read() == ""
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.seek(8, os.SEEK_END)
assert sf.read() == ""
def test_seek_before_start(self, data, testfile):
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.seek(-2)
assert sf.read() == data[2:6]
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.read(1)
sf.seek(-4, os.SEEK_CUR)
assert sf.read() == data[2:6]
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.seek(-8, os.SEEK_END)
assert sf.read() == data[2:6]
def test_seek(self, data, testfile):
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.seek(2)
assert sf.read() == data[4:6]
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.read(1)
sf.seek(2, os.SEEK_CUR)
assert sf.read() == data[5:6]
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.seek(-2, os.SEEK_END)
assert sf.read() == data[4:6]
def test_readinto(self, data, testfile):
b = bytearray(4)
with testfile.open("rb") as f:
assert Subfile(f, 2, 6).readinto(b) == 4
assert b == b"2345"
def test_readline(self, data, testfile):
with testfile.open() as f:
assert Subfile(f, 2, 14).readline() == data[2:11]
with testfile.open() as f:
assert Subfile(f, 2, 14).readline(15) == data[2:11]
def test_respects_read_size(self, data, testfile):
with testfile.open() as f:
assert Subfile(f, 2, 6).read(2) == data[2:4]
with testfile.open() as f:
assert Subfile(f, 2, 6).readline(2) == data[2:4]
def test_tell(self, data, testfile):
with testfile.open() as f:
sf = Subfile(f, 2, 6)
assert sf.tell() == 0
sf.seek(3)
assert sf.tell() == 3
def test_seek_after_end(self, testfile):
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.seek(8)
assert sf.read() == ''
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.read(1)
sf.seek(8, os.SEEK_CUR)
assert sf.read() == ''
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.seek(8, os.SEEK_END)
assert sf.read() == ''
def test_seek_before_start(self, data, testfile):
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.seek(-2)
assert sf.read() == data[2:6]
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.read(1)
sf.seek(-4, os.SEEK_CUR)
assert sf.read() == data[2:6]
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.seek(-8, os.SEEK_END)
assert sf.read() == data[2:6]
def test_seek(self, data, testfile):
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.seek(2)
assert sf.read() == data[4:6]
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.read(1)
sf.seek(2, os.SEEK_CUR)
assert sf.read() == data[5:6]
with testfile.open() as f:
sf = Subfile(f, 2, 6)
sf.seek(-2, os.SEEK_END)
assert sf.read() == data[4:6]