Delete test_str.py. There's not much there I care about, and it is confused

about whether it's testing str8 or str...  The stuff that matters is already
tested in test_unicode.py anyway.

Lib/test/test_str.py

-
-import unittest
-import struct
-import sys
-from test import test_support, string_tests
-
-
-class StrTest(
-    string_tests.CommonTest,
-    string_tests.MixinStrUnicodeUserStringTest,
-    string_tests.MixinStrUnicodeTest,
-    ):
-
-    type2test = str8
-
-    # We don't need to propagate to str
-    def fixtype(self, obj):
-        return obj
-
-    def test_formatting(self):
-        string_tests.MixinStrUnicodeUserStringTest.test_formatting(self)
-        self.assertRaises(OverflowError, '%c'.__mod__, 0x12341234)
-
-    def test_iterators(self):
-        # Make sure str objects have an __iter__ method
-        it = "abc".__iter__()
-        self.assertEqual(next(it), "a")
-        self.assertEqual(next(it), "b")
-        self.assertEqual(next(it), "c")
-        self.assertRaises(StopIteration, next, it)
-
-    def test_conversion(self):
-        # Make sure __str__() behaves properly
-
-        class Foo1:
-            def __str__(self):
-                return "foo"
-
-        class Foo7(str):
-            def __str__(self):
-                return "foos"
-
-        class Foo8(str):
-            def __new__(cls, content=""):
-                return str.__new__(cls, 2*content)
-            def __str__(self):
-                return self
-
-        self.assertEqual(str(Foo1()), "foo")
-        self.assertEqual(str(Foo7("bar")), "foos")
-        self.assertEqual(str(Foo8("foo")), "foofoo")
-
-    def test_expandtabs_overflows_gracefully(self):
-        # This test only affects 32-bit platforms because expandtabs can only take
-        # an int as the max value, not a 64-bit C long.  If expandtabs is changed
-        # to take a 64-bit long, this test should apply to all platforms.
-        if sys.maxint > (1 << 32) or struct.calcsize('P') != 4:
-            return
-        self.assertRaises(OverflowError, 't\tt\t'.expandtabs, sys.maxint)
-
-
-def test_main():
-    test_support.run_unittest(StrTest)
-
-if __name__ == "__main__":
-    test_main()