Increase test coverage for math.py fabs() function

[manoj-km24]

In Lib/test/test_math.py, the testFabs() method tests integers but not infinity (especially negative infinity).

def testFabs(self):
        self.assertRaises(TypeError, math.fabs)
        self.ftest('fabs(-1)', math.fabs(-1), 1)
        self.ftest('fabs(0)', math.fabs(0), 0)
        self.ftest('fabs(1)', math.fabs(1), 1)

I have submitted a PR that increases test coverage for fabs().

Linked PRs

• gh-149059: Increase test coverage for fabs() function in math.py #149060
• gh-149059: Increase test coverage for fabs() function #149061