cpython/Lib/test/test_dbm.py

#! /usr/bin/env python
"""Test script for the dbm module
   Roger E. Masse
"""
import os
import random
import dbm
from dbm import error
from test.test_support import verbose, verify, TestSkipped, TESTFN

# make filename unique to allow multiple concurrent tests
# and to minimize the likelihood of a problem from an old file
filename = TESTFN

def cleanup():
    for suffix in ['', '.pag', '.dir', '.db']:
        try:
            os.unlink(filename + suffix)
        except OSError as e:
            (errno, strerror) = e.errno, e.strerror
            # if we can't delete the file because of permissions,
            # nothing will work, so skip the test
            if errno == 1:
                raise TestSkipped, 'unable to remove: ' + filename + suffix

def test_keys():
    d = dbm.open(filename, 'c')
    verify(d.keys() == [])
    d[b'a'] = b'b'
    d[b'12345678910'] = b'019237410982340912840198242'
    d.keys()
    if b'a' in d:
        if verbose:
            print('Test dbm keys: ', d.keys())

    d.close()

def test_modes():
    d = dbm.open(filename, 'r')
    d.close()
    d = dbm.open(filename, 'rw')
    d.close()
    d = dbm.open(filename, 'w')
    d.close()
    d = dbm.open(filename, 'n')
    d.close()

cleanup()
try:
    test_keys()
    test_modes()
except:
    cleanup()
    raise

cleanup()