SF patch #736962: Port tests to unittest (Part 2)

(Contributed by Walter Dörwald.)

* Convert test_slice.py to unittest format
* Expand the test coverage.

Lib/test/test_slice.py

 # tests for slice objects; in particular the indices method.
 
-from test.test_support import vereq
+import unittest
+from test import test_support
+
 import sys
 
-vereq(slice(None           ).indices(10), (0, 10,  1))
-vereq(slice(None,  None,  2).indices(10), (0, 10,  2))
-vereq(slice(1,     None,  2).indices(10), (1, 10,  2))
-vereq(slice(None,  None, -1).indices(10), (9, -1, -1))
-vereq(slice(None,  None, -2).indices(10), (9, -1, -2))
-vereq(slice(3,     None, -2).indices(10), (3, -1, -2))
-vereq(slice(-100,  100     ).indices(10), slice(None).indices(10))
-vereq(slice(100,  -100,  -1).indices(10), slice(None, None, -1).indices(10))
-vereq(slice(-100L, 100L, 2L).indices(10), (0, 10,  2))
-
-vereq(range(10)[::sys.maxint - 1], [0])
+class SliceTest(unittest.TestCase):
+
+    def test_constructor(self):
+        self.assertRaises(TypeError, slice)
+        self.assertRaises(TypeError, slice, 1, 2, 3, 4)
+
+    def test_repr(self):
+        self.assertEqual(repr(slice(1, 2, 3)), "slice(1, 2, 3)")
+
+    def test_cmp(self):
+        s1 = slice(1, 2, 3)
+        s2 = slice(1, 2, 3)
+        s3 = slice(1, 2, 4)
+        self.assertEqual(s1, s2)
+        self.assertNotEqual(s1, s3)
+
+        class Exc(Exception):
+            pass
+
+        class BadCmp(object):
+            def __eq__(self, other):
+                raise Exc
+
+        s1 = slice(BadCmp())
+        s2 = slice(BadCmp())
+        self.assertRaises(Exc, cmp, s1, s2)
+        self.assertEqual(s1, s1)
+
+        s1 = slice(1, BadCmp())
+        s2 = slice(1, BadCmp())
+        self.assertEqual(s1, s1)
+        self.assertRaises(Exc, cmp, s1, s2)
+
+        s1 = slice(1, 2, BadCmp())
+        s2 = slice(1, 2, BadCmp())
+        self.assertEqual(s1, s1)
+        self.assertRaises(Exc, cmp, s1, s2)
+
+    def test_members(self):
+        s = slice(1)
+        self.assertEqual(s.start, None)
+        self.assertEqual(s.stop, 1)
+        self.assertEqual(s.step, None)
+
+        s = slice(1, 2)
+        self.assertEqual(s.start, 1)
+        self.assertEqual(s.stop, 2)
+        self.assertEqual(s.step, None)
+
+        s = slice(1, 2, 3)
+        self.assertEqual(s.start, 1)
+        self.assertEqual(s.stop, 2)
+        self.assertEqual(s.step, 3)
+
+        class AnyClass:
+            pass
+
+        obj = AnyClass()
+        s = slice(obj)
+        self.assert_(s.stop is obj)
+
+    def test_indices(self):
+        self.assertEqual(slice(None           ).indices(10), (0, 10,  1))
+        self.assertEqual(slice(None,  None,  2).indices(10), (0, 10,  2))
+        self.assertEqual(slice(1,     None,  2).indices(10), (1, 10,  2))
+        self.assertEqual(slice(None,  None, -1).indices(10), (9, -1, -1))
+        self.assertEqual(slice(None,  None, -2).indices(10), (9, -1, -2))
+        self.assertEqual(slice(3,     None, -2).indices(10), (3, -1, -2))
+        self.assertEqual(
+            slice(-100,  100     ).indices(10),
+            slice(None).indices(10)
+        )
+        self.assertEqual(
+            slice(100,  -100,  -1).indices(10),
+            slice(None, None, -1).indices(10)
+        )
+        self.assertEqual(slice(-100L, 100L, 2L).indices(10), (0, 10,  2))
+
+        self.assertEqual(range(10)[::sys.maxint - 1], [0])
+
+        self.assertRaises(OverflowError, slice(None).indices, 1L<<100)
+
+def test_main():
+    test_support.run_unittest(SliceTest)
+
+if __name__ == "__main__":
+    test_main()