cpython/Lib/test/test_contains.py

from test_support import TestFailed

class base_set:

	def __init__(self, el):
		self.el = el

class set(base_set):

	def __contains__(self, el):
		return self.el == el

class seq(base_set):

	def __getitem__(self, n):
		return [self.el][n]

def check(ok, *args):
    if not ok:
        raise TestFailed, " ".join(map(str, args))

a = base_set(1)
b = set(1)
c = seq(1)

check(1 in b, "1 not in set(1)")
check(0 not in b, "0 in set(1)")
check(1 in c, "1 not in seq(1)")
check(0 not in c, "0 in seq(1)")

try:
	1 in a
	check(0, "in base_set did not raise error")
except AttributeError:
	pass

try:
	1 not in a
	check(0, "not in base_set did not raise error")
except AttributeError:
	pass

# Test char in string

check('c' in 'abc', "'c' not in 'abc'")
check('d' not in 'abc', "'d' in 'abc'")

try:
	'' in 'abc'
	check(0, "'' in 'abc' did not raise error")
except TypeError:
	pass

try:
	'ab' in 'abc'
	check(0, "'ab' in 'abc' did not raise error")
except TypeError:
	pass

try:
	None in 'abc'
	check(0, "None in 'abc' did not raise error")
except TypeError:
	pass

# Test char in Unicode

check('c' in u'abc', "'c' not in u'abc'")
check('d' not in u'abc', "'d' in u'abc'")

try:
	'' in u'abc'
	check(0, "'' in u'abc' did not raise error")
except TypeError:
	pass

try:
	'ab' in u'abc'
	check(0, "'ab' in u'abc' did not raise error")
except TypeError:
	pass

try:
	None in u'abc'
	check(0, "None in u'abc' did not raise error")
except TypeError:
	pass

# Test Unicode char in Unicode

check(u'c' in u'abc', "u'c' not in u'abc'")
check(u'd' not in u'abc', "u'd' in u'abc'")

try:
	u'' in u'abc'
	check(0, "u'' in u'abc' did not raise error")
except TypeError:
	pass

try:
	u'ab' in u'abc'
	check(0, "u'ab' in u'abc' did not raise error")
except TypeError:
	pass

# Test Unicode char in string

check(u'c' in 'abc', "u'c' not in 'abc'")
check(u'd' not in 'abc', "u'd' in 'abc'")

try:
	u'' in 'abc'
	check(0, "u'' in 'abc' did not raise error")
except TypeError:
	pass

try:
	u'ab' in 'abc'
	check(0, "u'ab' in 'abc' did not raise error")
except TypeError:
	pass