Hello all,
I was looking throw the test code in cpython to use a test cases for my own python interpreter.
While looking at the code, I got curious.

First is this function.

cpython/Lib/test/test_unary.py

Lines 23 to 27 in 7e3f09c

	def test_invert(self):
	self.assertTrue(-2 == 0 - 2)
	self.assertEqual(-0, 0)
	self.assertEqual(--2, 2)
	self.assertTrue(-2 == 0 - 2)

I think this function is not testing invert operator.
Instead it is just copying test cases of negative operator.

Next is these functions.

cpython/Lib/test/test_unary.py

Lines 7 to 13 in 7e3f09c

	def test_negative(self):
	self.assertTrue(-2 == 0 - 2)
	self.assertEqual(-0, 0)
	self.assertEqual(--2, 2)
	self.assertTrue(-2 == 0 - 2)
	self.assertTrue(-2.0 == 0 - 2.0)
	self.assertTrue(-2j == 0 - 2j)

cpython/Lib/test/test_unary.py

Lines 15 to 21 in 7e3f09c

	def test_positive(self):
	self.assertEqual(+2, 2)
	self.assertEqual(+0, 0)
	self.assertEqual(++2, 2)
	self.assertEqual(+2, 2)
	self.assertEqual(+2.0, 2.0)
	self.assertEqual(+2j, 2j)

I think these functions have duplicated test cases.
self.assertTrue(-2 == 0 - 2) tested twice in test_negative,
self.assertEqual(+2, 2) tested twice as well in test_positive.

I want to know if there is an intention that I don't know.
Or if there is a problem, I think we need to fix the test code.

Linked PRs

• gh-99688: Fix tests in test in test_unary.py #99712