cpython/Lib/test/seq_tests.py

"""
Tests common to tuple, list and UserList.UserList
"""

import unittest
from test import test_support

class CommonTest(unittest.TestCase):
    # The type to be tested
    type2test = None

    def test_constructors(self):
        l0 = []
        l1 = [0]
        l2 = [0, 1]

        u = self.type2test()
        u0 = self.type2test(l0)
        u1 = self.type2test(l1)
        u2 = self.type2test(l2)

        uu = self.type2test(u)
        uu0 = self.type2test(u0)
        uu1 = self.type2test(u1)
        uu2 = self.type2test(u2)

        v = self.type2test(tuple(u))
        class OtherSeq:
            def __init__(self, initseq):
                self.__data = initseq
            def __len__(self):
                return len(self.__data)
            def __getitem__(self, i):
                return self.__data[i]
        s = OtherSeq(u0)
        v0 = self.type2test(s)
        self.assertEqual(len(v0), len(s))

        s = "this is also a sequence"
        vv = self.type2test(s)
        self.assertEqual(len(vv), len(s))

    def test_truth(self):
        self.assert_(not self.type2test())
        self.assert_(self.type2test([42]))

    def test_getitem(self):
        u = self.type2test([0, 1, 2, 3, 4])
        for i in xrange(len(u)):
            self.assertEqual(u[i], i)
        for i in xrange(-len(u), -1):
            self.assertEqual(u[i], len(u)+i)
        self.assertRaises(IndexError, u.__getitem__, -len(u)-1)
        self.assertRaises(IndexError, u.__getitem__, len(u))

        u = self.type2test()
        self.assertRaises(IndexError, u.__getitem__, 0)
        self.assertRaises(IndexError, u.__getitem__, -1)

        self.assertRaises(TypeError, u.__getitem__)

    def test_getslice(self):
        l = [0, 1, 2, 3, 4]
        u = self.type2test(l)

        self.assertEqual(u[0:0], self.type2test())
        self.assertEqual(u[1:2], self.type2test([1]))
        self.assertEqual(u[-2:-1], self.type2test([3]))
        self.assertEqual(u[-1000:1000], u)
        self.assertEqual(u[1000:-1000], self.type2test([]))
        self.assertEqual(u[:], u)
        self.assertEqual(u[1:None], self.type2test([1, 2, 3, 4]))
        self.assertEqual(u[None:3], self.type2test([0, 1, 2]))

        # Extended slices
        self.assertEqual(u[::], u)
        self.assertEqual(u[::2], self.type2test([0, 2, 4]))
        self.assertEqual(u[1::2], self.type2test([1, 3]))
        self.assertEqual(u[::-1], self.type2test([4, 3, 2, 1, 0]))
        self.assertEqual(u[::-2], self.type2test([4, 2, 0]))
        self.assertEqual(u[3::-2], self.type2test([3, 1]))
        self.assertEqual(u[3:3:-2], self.type2test([]))
        self.assertEqual(u[3:2:-2], self.type2test([3]))
        self.assertEqual(u[3:1:-2], self.type2test([3]))
        self.assertEqual(u[3:0:-2], self.type2test([3, 1]))
        self.assertEqual(u[::-100], self.type2test([4]))
        self.assertEqual(u[100:-100:], self.type2test([]))
        self.assertEqual(u[-100:100:], u)
        self.assertEqual(u[100:-100:-1], u[::-1])
        self.assertEqual(u[-100:100:-1], self.type2test([]))
        self.assertEqual(u[-100L:100L:2L], self.type2test([0, 2, 4]))

        # Test extreme cases with long ints
        a = self.type2test([0,1,2,3,4])
        self.assertEqual(a[ -pow(2,128L): 3 ], self.type2test([0,1,2]))
        self.assertEqual(a[ 3: pow(2,145L) ], self.type2test([3,4]))

        self.assertRaises(TypeError, u.__getslice__)

    def test_contains(self):
        u = self.type2test([0, 1, 2])
        for i in u:
            self.assert_(i in u)
        for i in min(u)-1, max(u)+1:
            self.assert_(i not in u)

        self.assertRaises(TypeError, u.__contains__)

    def test_len(self):
        self.assertEqual(len(self.type2test()), 0)
        self.assertEqual(len(self.type2test([])), 0)
        self.assertEqual(len(self.type2test([0])), 1)
        self.assertEqual(len(self.type2test([0, 1, 2])), 3)

    def test_minmax(self):
        u = self.type2test([0, 1, 2])
        self.assertEqual(min(u), 0)
        self.assertEqual(max(u), 2)

    def test_addmul(self):
        u1 = self.type2test([0])
        u2 = self.type2test([0, 1])
        self.assertEqual(u1, u1 + self.type2test())
        self.assertEqual(u1, self.type2test() + u1)
        self.assertEqual(u1 + self.type2test([1]), u2)
        self.assertEqual(self.type2test([-1]) + u1, self.type2test([-1, 0]))
        self.assertEqual(self.type2test(), u2*0)
        self.assertEqual(self.type2test(), 0*u2)
        self.assertEqual(self.type2test(), u2*0L)
        self.assertEqual(self.type2test(), 0L*u2)
        self.assertEqual(u2, u2*1)
        self.assertEqual(u2, 1*u2)
        self.assertEqual(u2, u2*1L)
        self.assertEqual(u2, 1L*u2)
        self.assertEqual(u2+u2, u2*2)
        self.assertEqual(u2+u2, 2*u2)
        self.assertEqual(u2+u2, u2*2L)
        self.assertEqual(u2+u2, 2L*u2)
        self.assertEqual(u2+u2+u2, u2*3)
        self.assertEqual(u2+u2+u2, 3*u2)

        class subclass(self.type2test):
            pass
        u3 = subclass([0, 1])
        self.assertEqual(u3, u3*1)
        self.assert_(u3 is not u3*1)

    def test_iadd(self):
        u = self.type2test([0, 1])
        u += self.type2test()
        self.assertEqual(u, self.type2test([0, 1]))
        u += self.type2test([2, 3])
        self.assertEqual(u, self.type2test([0, 1, 2, 3]))
        u += self.type2test([4, 5])
        self.assertEqual(u, self.type2test([0, 1, 2, 3, 4, 5]))

        u = self.type2test("spam")
        u += self.type2test("eggs")
        self.assertEqual(u, self.type2test("spameggs"))

    def test_imul(self):
        u = self.type2test([0, 1])
        u *= 3
        self.assertEqual(u, self.type2test([0, 1, 0, 1, 0, 1]))

    def test_getitemoverwriteiter(self):
        # Verify that __getitem__ overrides are not recognized by __iter__
        class T(self.type2test):
            def __getitem__(self, key):
                return str(key) + '!!!'
        self.assertEqual(iter(T((1,2))).next(), 1)