Is this on OSX? That test has been failing (because on that platform sqrt(-1) returns nan instead of raising ValueError) for years -- but the test is only run when run in verbose mode, which mostly hides the issue. Have you read the comment for the test?
On 9/4/07, Hasan Diwan email@example.com wrote:
I'm trying to fix a failing unit test in revision 57974. The test in question claims that math.sqrt(-1) should raise ValueError; the code itself gives "nan" as a result for that expression. I can modify the test and therefore have it pass, but I'm not sure if an exception would be more appropriate. I'd be happy for some direction here. Many thanks!