Move test_gdbm to use unittest.

Closes issue #1960. Thanks Giampaolo Rodola.

Lib/test/test_gdbm.py

-#! /usr/bin/env python
-"""Test script for the gdbm module
-   Roger E. Masse
-"""
-
 import gdbm
-from gdbm import error
-from test.test_support import verbose, verify, TestFailed, TESTFN
+import unittest
+import os
+from test.test_support import verbose, TESTFN, run_unittest, unlink
+
 
 filename = TESTFN
 
-g = gdbm.open(filename, 'c')
-verify(g.keys() == [])
-g['a'] = 'b'
-g['12345678910'] = '019237410982340912840198242'
-a = g.keys()
-if verbose:
-    print 'Test gdbm file keys: ', a
-
-g.has_key('a')
-g.close()
-try:
-    g['a']
-except error:
-    pass
-else:
-    raise TestFailed, "expected gdbm.error accessing closed database"
-g = gdbm.open(filename, 'r')
-g.close()
-g = gdbm.open(filename, 'w')
-g.close()
-g = gdbm.open(filename, 'n')
-g.close()
-try:
-    g = gdbm.open(filename, 'rx')
-    g.close()
-except error:
-    pass
-else:
-    raise TestFailed, "expected gdbm.error when passing invalid open flags"
-
-try:
-    import os
-    os.unlink(filename)
-except:
-    pass
+class TestGdbm(unittest.TestCase):
+
+    def setUp(self):
+        self.g = None
+
+    def tearDown(self):
+        if self.g is not None:
+            self.g.close()
+        unlink(filename)
+
+    def test_key_methods(self):
+        self.g = gdbm.open(filename, 'c')
+        self.assertEqual(self.g.keys(), [])
+        self.g['a'] = 'b'
+        self.g['12345678910'] = '019237410982340912840198242'
+        key_set = set(self.g.keys())
+        self.assertEqual(key_set, frozenset(['a', '12345678910']))
+        self.assert_(self.g.has_key('a'))
+        key = self.g.firstkey()
+        while key:
+            self.assert_(key in key_set)
+            key_set.remove(key)
+            key = self.g.nextkey(key)
+        self.assertRaises(KeyError, lambda: self.g['xxx'])
+
+    def test_error_conditions(self):
+        # Try to open a non-existent database.
+        unlink(filename)
+        self.assertRaises(gdbm.error, gdbm.open, filename, 'r')
+        self.assertRaises(gdbm.error, gdbm.open, filename, 'w')
+        # Try to access a closed database.
+        self.g = gdbm.open(filename, 'c')
+        self.g.close()
+        self.assertRaises(gdbm.error, lambda: self.g['a'])
+        # try pass an invalid open flag
+        self.assertRaises(gdbm.error, lambda: gdbm.open(filename, 'rx').close())
+
+    def test_flags(self):
+        # Test the flag parameter open() by trying all supported flag modes.
+        all = set(gdbm.open_flags)
+        # Test standard flags (presumably "crwn").
+        modes = all - set('fsu')
+        for mode in modes:
+            self.g = gdbm.open(filename, mode)
+            self.g.close()
+
+        # Test additional flags (presumably "fsu").
+        flags = all - set('crwn')
+        for mode in modes:
+            for flag in flags:
+                self.g = gdbm.open(filename, mode + flag)
+                self.g.close()
+
+    def test_reorganize(self):
+        self.g = gdbm.open(filename, 'c')
+        size0 = os.path.getsize(filename)
+
+        self.g['x'] = 'x' * 10000
+        size1 = os.path.getsize(filename)
+        self.assert_(size0 < size1)
+
+        del self.g['x']
+        # 'size' is supposed to be the same even after deleting an entry.
+        self.assertEqual(os.path.getsize(filename), size1)
+
+        self.g.reorganize()
+        size2 = os.path.getsize(filename)
+        self.assert_(size1 > size2 >= size0)
+
+
+def test_main():
+    run_unittest(TestGdbm)
+
+if __name__ == '__main__':
+    test_main()

Misc/ACKS

@@ -559,6 +559,7 @@ Mark Roberts
 Andy Robinson
 Jim Robinson
 Kevin Rodgers
+Giampaolo Rodola
 Mike Romberg
 Case Roole
 Timothy Roscoe

Misc/NEWS

@@ -50,6 +50,8 @@ Library
 Tests
 -----
 
+- Issue 1960: Convert test_gdbm to unittest.
+
 - GHOP 294: Convert test_contains, test_crypt, and test_select to unittest.
 
 - GHOP 238: Convert test_tokenize to use doctest.