Add additional tests for isinf() function in cmath library

[manoj-km24]

Feature or enhancement

Proposal:

In Lib/test/test_cmath.py , under the test_isinf() method , many test cases for isinf method are available but edge cases like -inf and inf/inf seems to be missing.

def test_isinf(self):
        self.assertFalse(cmath.isinf(1))
        self.assertFalse(cmath.isinf(1j))
        self.assertFalse(cmath.isinf(NAN))
        self.assertTrue(cmath.isinf(INF))
        self.assertTrue(cmath.isinf(complex(INF, 0)))
        self.assertTrue(cmath.isinf(complex(0, INF)))
        self.assertTrue(cmath.isinf(complex(INF, INF)))
        self.assertTrue(cmath.isinf(complex(NAN, INF)))
        self.assertTrue(cmath.isinf(complex(INF, NAN)))

I have opened a PR adding 2 test cases for -inf and inf/inf

Has this already been discussed elsewhere?

No

Links to previous discussion of this feature:

Linked PRs

• gh-148868: Increase test coverage for cmath.isinf #148869

[skirpichev]

inf/inf is nan - it's present.

Note also, that isinf has much more tests, it's used in rAssertAlmostEqual.

[manoj-km24]

inf/inf is nan - it's present.

Note also, that isinf has much more tests, it's used in rAssertAlmostEqual.

Noted , Thanks for telling