def test_tell():
f = RStringIO()
f.write('0123')
f.write('456')
assert f.tell() == 7
f.seek(2)
for i in range(3, 20):
f.write('X')
assert f.tell() == i
assert f.getvalue() == '01XXXXXXXXXXXXXXXXX'
def test_stress():
import cStringIO, random
f = RStringIO()
expected = cStringIO.StringIO()
for i in range(2000):
r = random.random()
if r < 0.15:
p = random.randrange(-5000, 10000)
if r < 0.05:
mode = 0
elif r < 0.1:
mode = 1
else:
mode = 2
print 'seek', p, mode
f.seek(p, mode)
expected.seek(p, mode)
elif r < 0.6:
buf = str(random.random())
print 'write %d bytes' % len(buf)
f.write(buf)
expected.write(buf)
elif r < 0.92:
n = random.randrange(0, 100)
print 'read %d bytes' % n
data1 = f.read(n)
data2 = expected.read(n)
assert data1 == data2
elif r < 0.97:
print 'check tell()'
assert f.tell() == expected.tell()
else:
print 'check getvalue()'
assert f.getvalue() == expected.getvalue()
assert f.getvalue() == expected.getvalue()
assert f.tell() == expected.tell()
def test_seek():
f = RStringIO()
f.write('0123')
f.write('456')
f.write('789')
f.seek(4)
f.write('AB')
assert f.getvalue() == '0123AB6789'
f.seek(-2, 2)
f.write('CDE')
assert f.getvalue() == '0123AB67CDE'
f.seek(2, 0)
f.seek(5, 1)
f.write('F')
assert f.getvalue() == '0123AB6FCDE'
def test_read():
f = RStringIO()
assert f.read() == ''
f.write('0123')
f.write('456')
assert f.read() == ''
assert f.read(5) == ''
assert f.tell() == 7
f.seek(1)
assert f.read() == '123456'
assert f.tell() == 7
f.seek(1)
assert f.read(12) == '123456'
assert f.tell() == 7
f.seek(1)
assert f.read(2) == '12'
assert f.read(1) == '3'
assert f.tell() == 4
f.seek(0)
assert f.read() == '0123456'
assert f.tell() == 7
f.seek(0)
assert f.read(7) == '0123456'
assert f.tell() == 7
f.seek(15)
assert f.read(2) == ''
assert f.tell() == 15
def test_write_beyond_end():
f = RStringIO()
f.seek(20, 1)
assert f.tell() == 20
f.write('X')
assert f.getvalue() == '\x00' * 20 + 'X'
