Limnoria/test/test_structures.py

#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
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###

from test import *

import pickle

from structures import *

class RingBufferTestCase(unittest.TestCase):
    def testInit(self):
        self.assertRaises(ValueError, RingBuffer, -1)
        self.assertRaises(ValueError, RingBuffer, 0)
        self.assertEqual(range(10), list(RingBuffer(10, range(10))))

    def testLen(self):
        b = RingBuffer(3)
        self.assertEqual(0, len(b))
        b.append(1)
        self.assertEqual(1, len(b))
        b.append(2)
        self.assertEqual(2, len(b))
        b.append(3)
        self.assertEqual(3, len(b))
        b.append(4)
        self.assertEqual(3, len(b))
        b.append(5)
        self.assertEqual(3, len(b))

    def testNonzero(self):
        b = RingBuffer(3)
        self.failIf(b)
        b.append(1)
        self.failUnless(b)

    def testAppend(self):
        b = RingBuffer(3)
        self.assertEqual([], list(b))
        b.append(1)
        self.assertEqual([1], list(b))
        b.append(2)
        self.assertEqual([1, 2], list(b))
        b.append(3)
        self.assertEqual([1, 2, 3], list(b))
        b.append(4)
        self.assertEqual([2, 3, 4], list(b))
        b.append(5)
        self.assertEqual([3, 4, 5], list(b))
        b.append(6)
        self.assertEqual([4, 5, 6], list(b))

    def testContains(self):
        b = RingBuffer(3, range(3))
        self.failUnless(0 in b)
        self.failUnless(1 in b)
        self.failUnless(2 in b)
        self.failIf(3 in b)

    def testGetitem(self):
        L = range(10)
        b = RingBuffer(len(L), L)
        for i in range(len(b)):
            self.assertEqual(L[i], b[i])
        for i in range(len(b)):
            self.assertEqual(L[-i], b[-i])
        for i in range(len(b)):
            b.append(i)
        for i in range(len(b)):
            self.assertEqual(L[i], b[i])
        for i in range(len(b)):
            self.assertEqual(list(b), list(b[:i]) + list(b[i:]))

    def testSliceGetitem(self):
        L = range(10)
        b = RingBuffer(len(L), L)
        for i in range(len(b)):
            self.assertEqual(L[:i], b[:i])
            self.assertEqual(L[i:], b[i:])
            self.assertEqual(L[i:len(b)-i], b[i:len(b)-i])
            self.assertEqual(L[:-i], b[:-i])
            self.assertEqual(L[-i:], b[-i:])
            self.assertEqual(L[i:-i], b[i:-i])
        for i in range(len(b)):
            b.append(i)
        for i in range(len(b)):
            self.assertEqual(L[:i], b[:i])
            self.assertEqual(L[i:], b[i:])
            self.assertEqual(L[i:len(b)-i], b[i:len(b)-i])
            self.assertEqual(L[:-i], b[:-i])
            self.assertEqual(L[-i:], b[-i:])
            self.assertEqual(L[i:-i], b[i:-i])

    def testSetitem(self):
        L = range(10)
        b = RingBuffer(len(L), [0]*len(L))
        for i in range(len(b)):
            b[i] = i
        for i in range(len(b)):
            self.assertEqual(b[i], i)
        for i in range(len(b)):
            b.append(0)
        for i in range(len(b)):
            b[i] = i
        for i in range(len(b)):
            self.assertEqual(b[i], i)

    def testSliceSetitem(self):
        L = range(10)
        b = RingBuffer(len(L), [0]*len(L))
        self.assertRaises(ValueError, b.__setitem__, slice(0, 10), [])
        b[2:4] = L[2:4]
        self.assertEquals(b[2:4], L[2:4])
        for i in range(len(b)):
            b.append(0)
        b[2:4] = L[2:4]
        self.assertEquals(b[2:4], L[2:4])

    def testExtend(self):
        b = RingBuffer(3, range(3))
        self.assertEqual(list(b), range(3))
        b.extend(range(6))
        self.assertEqual(list(b), range(6)[3:])

    def testRepr(self):
        b = RingBuffer(3)
        self.assertEqual(repr(b), 'RingBuffer(3, [])')
        b.append(1)
        self.assertEqual(repr(b), 'RingBuffer(3, [1])')
        b.append(2)
        self.assertEqual(repr(b), 'RingBuffer(3, [1, 2])')
        b.append(3)
        self.assertEqual(repr(b), 'RingBuffer(3, [1, 2, 3])')
        b.append(4)
        self.assertEqual(repr(b), 'RingBuffer(3, [2, 3, 4])')
        b.append(5)
        self.assertEqual(repr(b), 'RingBuffer(3, [3, 4, 5])')
        b.append(6)
        self.assertEqual(repr(b), 'RingBuffer(3, [4, 5, 6])')

    def testPickleCopy(self):
        b = RingBuffer(10, range(10))
        self.assertEqual(pickle.loads(pickle.dumps(b)), b)

    def testEq(self):
        b = RingBuffer(3, range(3))
        self.failIf(b == range(3))
        b1 = RingBuffer(3)
        self.failIf(b == b1)
        b1.append(0)
        self.failIf(b == b1)
        b1.append(1)
        self.failIf(b == b1)
        b1.append(2)
        self.failUnless(b == b1)
        b = RingBuffer(100, range(10))
        b1 = RingBuffer(10, range(10))
        self.failIf(b == b1)
        
    def testIter(self):
        b = RingBuffer(3, range(3))
        L = []
        for elt in b:
            L.append(elt)
        self.assertEqual(L, range(3))
        for elt in range(3):
            b.append(elt)
        del L[:]
        for elt in b:
            L.append(elt)
        self.assertEqual(L, range(3))


class QueueTest(unittest.TestCase):
    def testGetitem(self):
        q = queue()
        n = 10
        self.assertRaises(IndexError, q.__getitem__, 0)
        for i in xrange(n):
            q.enqueue(i)
        for i in xrange(n):
            self.assertEqual(q[i], i)
        for i in xrange(n, 0, -1):
            self.assertEqual(q[-i], n-i)
        for i in xrange(len(q)):
            self.assertEqual(list(q), list(q[:i]) + list(q[i:]))
        self.assertRaises(IndexError, q.__getitem__, -(n+1))
        self.assertRaises(IndexError, q.__getitem__, n)
        self.assertEqual(q[3:7], queue([3, 4, 5, 6]))
        
    def testSetitem(self):
        q1 = queue()
        self.assertRaises(IndexError, q1.__setitem__, 0, 0)
        for i in xrange(10):
            q1.enqueue(i)
        q2 = eval(repr(q1))
        for (i, elt) in enumerate(q2):
            q2[i] = elt*2
        self.assertEqual([x*2 for x in q1], list(q2))
        
    def testNonzero(self):
        q = queue()
        self.failIf(q, 'queue not zero after initialization')
        q.enqueue(1)
        self.failUnless(q, 'queue zero after adding element')
        q.dequeue()
        self.failIf(q, 'queue not zero after dequeue of only element')

    def testLen(self):
        q = queue()
        self.assertEqual(0, len(q), 'queue len not 0 after initialization')
        q.enqueue(1)
        self.assertEqual(1, len(q), 'queue len not 1 after enqueue')
        q.enqueue(2)
        self.assertEqual(2, len(q), 'queue len not 2 after enqueue')
        q.dequeue()
        self.assertEqual(1, len(q), 'queue len not 1 after dequeue')
        q.dequeue()
        self.assertEqual(0, len(q), 'queue len not 0 after dequeue')
        for i in range(10):
            L = range(i)
            q = queue(L)
            self.assertEqual(len(q), i)

    def testEq(self):
        q1 = queue()
        q2 = queue()
        self.failUnless(q1 == q1, 'queue not equal to itself')
        self.failUnless(q2 == q2, 'queue not equal to itself')
        self.failUnless(q1 == q2, 'initialized queues not equal')
        q1.enqueue(1)
        self.failUnless(q1 == q1, 'queue not equal to itself')
        self.failUnless(q2 == q2, 'queue not equal to itself')
        q2.enqueue(1)
        self.failUnless(q1 == q1, 'queue not equal to itself')
        self.failUnless(q2 == q2, 'queue not equal to itself')
        self.failUnless(q1 == q2, 'queues not equal after identical enqueue')
        q1.dequeue()
        self.failUnless(q1 == q1, 'queue not equal to itself')
        self.failUnless(q2 == q2, 'queue not equal to itself')
        self.failIf(q1 == q2, 'queues equal after one dequeue')
        q2.dequeue()
        self.failUnless(q1 == q2, 'queues not equal after both are dequeued')
        self.failUnless(q1 == q1, 'queue not equal to itself')
        self.failUnless(q2 == q2, 'queue not equal to itself')

    def testInit(self):
        self.assertEqual(len(queue()), 0, 'queue len not 0 after init')
        q = queue()
        q.enqueue(1)
        q.enqueue(2)
        q.enqueue(3)
        self.assertEqual(queue((1, 2, 3)),q, 'init not equivalent to enqueues')
        q = queue((1, 2, 3))
        self.assertEqual(q.dequeue(), 1, 'values not returned in proper order')
        self.assertEqual(q.dequeue(), 2, 'values not returned in proper order')
        self.assertEqual(q.dequeue(), 3, 'values not returned in proper order')

    def testRepr(self):
        q = queue()
        q.enqueue(1)
        self.assertEqual(q, eval(repr(q)), 'repr doesn\'t eval to same queue')
        q.enqueue('foo')
        self.assertEqual(q, eval(repr(q)), 'repr doesn\'t eval to same queue')
        q.enqueue(None)
        self.assertEqual(q, eval(repr(q)), 'repr doesn\'t eval to same queue')
        q.enqueue(1.0)
        self.assertEqual(q, eval(repr(q)), 'repr doesn\'t eval to same queue')
        q.enqueue([])
        self.assertEqual(q, eval(repr(q)), 'repr doesn\'t eval to same queue')
        q.enqueue(())
        self.assertEqual(q, eval(repr(q)), 'repr doesn\'t eval to same queue')
        q.enqueue([1])
        self.assertEqual(q, eval(repr(q)), 'repr doesn\'t eval to same queue')
        q.enqueue((1,))
        self.assertEqual(q, eval(repr(q)), 'repr doesn\'t eval to same queue')
        
    def testEnqueueDequeue(self):
        q = queue()
        self.assertRaises(IndexError, q.dequeue)
        q.enqueue(1)
        self.assertEqual(q.dequeue(), 1,
                         'first dequeue didn\'t return same as first enqueue')
        q.enqueue(1)
        q.enqueue(2)
        q.enqueue(3)
        self.assertEqual(q.dequeue(), 1)
        self.assertEqual(q.dequeue(), 2)
        self.assertEqual(q.dequeue(), 3)

    def testPeek(self):
        q = queue()
        self.assertRaises(IndexError, q.peek)
        q.enqueue(1)
        self.assertEqual(q.peek(), 1, 'peek didn\'t return first enqueue')
        q.enqueue(2)
        self.assertEqual(q.peek(), 1, 'peek didn\'t return first enqueue')
        q.dequeue()
        self.assertEqual(q.peek(), 2, 'peek didn\'t return second enqueue')
        q.dequeue()
        self.assertRaises(IndexError, q.peek)

    def testContains(self):
        q = queue()
        self.failIf(1 in q, 'empty queue cannot have elements')
        q.enqueue(1)
        self.failUnless(1 in q, 'recent enqueued element not in q')
        q.enqueue(2)
        self.failUnless(1 in q, 'original enqueued element not in q')
        self.failUnless(2 in q, 'second enqueued element not in q')
        q.dequeue()
        self.failIf(1 in q, 'dequeued element in q')
        self.failUnless(2 in q, 'not dequeued element not in q')
        q.dequeue()
        self.failIf(2 in q, 'dequeued element in q')

    def testIter(self):
        q1 = queue((1, 2, 3))
        q2 = queue()
        for i in q1:
            q2.enqueue(i)
        self.assertEqual(q1, q2, 'iterate didn\'t return all elements')
        for _ in queue():
            self.fail('no elements should be in empty queue')

    def testPickleCopy(self):
        q = queue(range(10))
        self.assertEqual(q, pickle.loads(pickle.dumps(q)))


class MaxLengthQueueTestCase(unittest.TestCase):
    def testInit(self):
        q = MaxLengthQueue(3, (1, 2, 3))
        self.assertEqual(list(q), [1, 2, 3])
        self.assertRaises(TypeError, MaxLengthQueue, 3, 1, 2, 3)
        
    def testMaxLength(self):
        q = MaxLengthQueue(3)
        q.enqueue(1)
        self.assertEqual(len(q), 1)
        q.enqueue(2)
        self.assertEqual(len(q), 2)
        q.enqueue(3)
        self.assertEqual(len(q), 3)
        q.enqueue(4)
        self.assertEqual(len(q), 3)
        self.assertEqual(q.peek(), 2)
        q.enqueue(5)
        self.assertEqual(len(q), 3)
        self.assertEqual(q[0], 3)


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