Lib/test/test_array.py

#! /usr/bin/env python
"""Test the arraymodule.
   Roger E. Masse
"""
import array
from test_support import verbose, TESTFN, unlink, TestFailed

def main():

    testtype('c', 'c')

    for type in (['b', 'h', 'i', 'l', 'f', 'd']):
        testtype(type, 1)

    unlink(TESTFN)


def testoverflow(type, lowerLimit, upperLimit):
        # should not overflow assigning lower limit
    if verbose:
        print "overflow test: array(%s, [%s])" % (`type`, `lowerLimit`)
    try:
        a = array.array(type, [lowerLimit])
    except:
        raise TestFailed, "array(%s) overflowed assigning %s" %\
                (`type`, `lowerLimit`)
    # should overflow assigning less than lower limit
    if verbose:
        print "overflow test: array(%s, [%s])" % (`type`, `lowerLimit-1`)
    try:
        a = array.array(type, [lowerLimit-1])
        raise TestFailed, "array(%s) did not overflow assigning %s" %\
                (`type`, `lowerLimit-1`)
    except OverflowError:
        pass
    # should not overflow assigning upper limit
    if verbose:
        print "overflow test: array(%s, [%s])" % (`type`, `upperLimit`)
    try:
        a = array.array(type, [upperLimit])
    except:
        raise TestFailed, "array(%s) overflowed assigning %s" %\
                (`type`, `upperLimit`)
    # should overflow assigning more than upper limit
    if verbose:
        print "overflow test: array(%s, [%s])" % (`type`, `upperLimit+1`)
    try:
        a = array.array(type, [upperLimit+1])
        raise TestFailed, "array(%s) did not overflow assigning %s" %\
                (`type`, `upperLimit+1`)
    except OverflowError:
        pass



def testtype(type, example):

    a = array.array(type)
    a.append(example)
    if verbose:
        print 40*'*'
        print 'array after append: ', a
    a.typecode
    a.itemsize
    if a.typecode in ('i', 'b', 'h', 'l'):
        a.byteswap()

    if a.typecode == 'c':
        f = open(TESTFN, "w")
        f.write("The quick brown fox jumps over the lazy dog.\n")
        f.close()
        f = open(TESTFN, 'r')
        a.fromfile(f, 10)
        f.close()
        if verbose:
            print 'char array with 10 bytes of TESTFN appended: ', a
        a.fromlist(['a', 'b', 'c'])
        if verbose:
            print 'char array with list appended: ', a

    a.insert(0, example)
    if verbose:
        print 'array of %s after inserting another:' % a.typecode, a
    f = open(TESTFN, 'w')
    a.tofile(f)
    f.close()

    # This block is just to verify that the operations don't blow up.
    a.tolist()
    a.tostring()
    repr(a)
    str(a)

    if verbose:
        print 'array of %s converted to a list: ' % a.typecode, a.tolist()
    if verbose:
        print 'array of %s converted to a string: ' \
               % a.typecode, `a.tostring()`

    if type == 'c':
        a = array.array(type, "abcde")
        a[:-1] = a
        if a != array.array(type, "abcdee"):
            raise TestFailed, "array(%s) self-slice-assign (head)" % `type`
        a = array.array(type, "abcde")
        a[1:] = a
        if a != array.array(type, "aabcde"):
            raise TestFailed, "array(%s) self-slice-assign (tail)" % `type`
        a = array.array(type, "abcde")
        a[1:-1] = a
        if a != array.array(type, "aabcdee"):
            raise TestFailed, "array(%s) self-slice-assign (cntr)" % `type`
        if a.index("e") != 5:
            raise TestFailed, "array(%s) index-test" % `type`
        if a.count("a") != 2:
            raise TestFailed, "array(%s) count-test" % `type`
        a.remove("e")
        if a != array.array(type, "aabcde"):
            raise TestFailed, "array(%s) remove-test" % `type`
        if a.pop(0) != "a":
            raise TestFailed, "array(%s) pop-test" % `type`
        if a.pop(1) != "b":
            raise TestFailed, "array(%s) pop-test" % `type`
        a.extend(array.array(type, "xyz"))
        if a != array.array(type, "acdexyz"):
            raise TestFailed, "array(%s) extend-test" % `type`
        a.pop()
        a.pop()
        a.pop()
        x = a.pop()
        if x != 'e':
            raise TestFailed, "array(%s) pop-test" % `type`
        if a != array.array(type, "acd"):
            raise TestFailed, "array(%s) pop-test" % `type`
        a.reverse()
        if a != array.array(type, "dca"):
            raise TestFailed, "array(%s) reverse-test" % `type`
    else:
        a = array.array(type, [1, 2, 3, 4, 5])
        a[:-1] = a
        if a != array.array(type, [1, 2, 3, 4, 5, 5]):
            raise TestFailed, "array(%s) self-slice-assign (head)" % `type`
        a = array.array(type, [1, 2, 3, 4, 5])
        a[1:] = a
        if a != array.array(type, [1, 1, 2, 3, 4, 5]):
            raise TestFailed, "array(%s) self-slice-assign (tail)" % `type`
        a = array.array(type, [1, 2, 3, 4, 5])
        a[1:-1] = a
        if a != array.array(type, [1, 1, 2, 3, 4, 5, 5]):
            raise TestFailed, "array(%s) self-slice-assign (cntr)" % `type`
        if a.index(5) != 5:
            raise TestFailed, "array(%s) index-test" % `type`
        if a.count(1) != 2:
            raise TestFailed, "array(%s) count-test" % `type`
        a.remove(5)
        if a != array.array(type, [1, 1, 2, 3, 4, 5]):
            raise TestFailed, "array(%s) remove-test" % `type`
        if a.pop(0) != 1:
            raise TestFailed, "array(%s) pop-test" % `type`
        if a.pop(1) != 2:
            raise TestFailed, "array(%s) pop-test" % `type`
        a.extend(array.array(type, [7, 8, 9]))
        if a != array.array(type, [1, 3, 4, 5, 7, 8, 9]):
            raise TestFailed, "array(%s) extend-test" % `type`
        a.pop()
        a.pop()
        a.pop()
        x = a.pop()
        if x != 5:
            raise TestFailed, "array(%s) pop-test" % `type`
        if a != array.array(type, [1, 3, 4]):
            raise TestFailed, "array(%s) pop-test" % `type`
        a.reverse()
        if a != array.array(type, [4, 3, 1]):
            raise TestFailed, "array(%s) reverse-test" % `type`

    # test that overflow exceptions are raised as expected for assignment
    # to array of specific integral types
    from math import pow
    if type in ('b', 'h', 'i', 'l'):
        # check signed and unsigned versions
        a = array.array(type)
        signedLowerLimit = -1 * long(pow(2, a.itemsize * 8 - 1))
        signedUpperLimit = long(pow(2, a.itemsize * 8 - 1)) - 1L
        unsignedLowerLimit = 0
        unsignedUpperLimit = long(pow(2, a.itemsize * 8)) - 1L
        testoverflow(type, signedLowerLimit, signedUpperLimit)
        testoverflow(type.upper(), unsignedLowerLimit, unsignedUpperLimit)



main()