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diff --git a/Lib/test/test_stringprep.py b/Lib/test/test_stringprep.py
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+++ b/Lib/test/test_stringprep.py
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+# To fully test this module, we would need a copy of the stringprep tables.
+# Since we don't have them, this test checks only a few codepoints.
+
+from test.test_support import verify, vereq
+import sha
+
+import stringprep
+from stringprep import *
+
+verify(in_table_a1(u"\u0221"))
+verify(not in_table_a1(u"\u0222"))
+
+verify(in_table_b1(u"\u00ad"))
+verify(not in_table_b1(u"\u00ae"))
+
+verify(map_table_b2(u"\u0041"), u"\u0061")
+verify(map_table_b2(u"\u0061"), u"\u0061")
+
+verify(map_table_b3(u"\u0041"), u"\u0061")
+verify(map_table_b3(u"\u0061"), u"\u0061")
+
+verify(in_table_c11(u"\u0020"))
+verify(not in_table_c11(u"\u0021"))
+
+verify(in_table_c12(u"\u00a0"))
+verify(not in_table_c12(u"\u00a1"))
+
+verify(in_table_c12(u"\u00a0"))
+verify(not in_table_c12(u"\u00a1"))
+
+verify(in_table_c11_c12(u"\u00a0"))
+verify(not in_table_c11_c12(u"\u00a1"))
+
+verify(in_table_c21(u"\u001f"))
+verify(not in_table_c21(u"\u0020"))
+
+verify(in_table_c22(u"\u009f"))
+verify(not in_table_c22(u"\u00a0"))
+
+verify(in_table_c21_c22(u"\u009f"))
+verify(not in_table_c21_c22(u"\u00a0"))
+
+verify(in_table_c3(u"\ue000"))
+verify(not in_table_c3(u"\uf900"))
+
+verify(in_table_c4(u"\uffff"))
+verify(not in_table_c4(u"\u0000"))
+
+verify(in_table_c5(u"\ud800"))
+verify(not in_table_c5(u"\ud7ff"))
+
+verify(in_table_c6(u"\ufff9"))
+verify(not in_table_c6(u"\ufffe"))
+
+verify(in_table_c7(u"\u2ff0"))
+verify(not in_table_c7(u"\u2ffc"))
+
+verify(in_table_c8(u"\u0340"))
+verify(not in_table_c8(u"\u0342"))
+
+# C.9 is not in the bmp
+# verify(in_table_c9(u"\U000E0001"))
+# verify(not in_table_c8(u"\U000E0002"))
+
+verify(in_table_d1(u"\u05be"))
+verify(not in_table_d1(u"\u05bf"))
+
+verify(in_table_d2(u"\u0041"))
+verify(not in_table_d2(u"\u0040"))
+
+# This would generate a hash of all predicates. However, running
+# it is quite expensive, and only serves to detect changes in the
+# unicode database. Instead, stringprep.py asserts the version of
+# of the database.
+
+# predicates = [k for k in dir(stringprep) if k.startswith("in_table")]
+# predicates.sort()
+# for p in predicates:
+#     f = getattr(stringprep, p)
+#     # Collect all BMP code points
+#     data = ["0"] * 0x10000
+#     for i in range(0x10000):
+#         if f(unichr(i)):
+#             data[i] = "1"
+#     data = "".join(data)
+#     h = sha.sha()
+#     h.update(data)
+#     print p,h.hexdigest()
+      
+