count_upper_lower("Hello World") ➞ Upper case: 2, Lower case: 8

count_upper_lower("Python Programming") ➞ Upper case: 2, Lower case: 15

count_upper_lower("12345AbCdEf") ➞ Upper case: 3, Lower case: 3

self.assertEqual(count_upper_lower("Hello World"), "Upper case: 2, Lower case: 8")
self.assertEqual(count_upper_lower("Python Programming"), "Upper case: 2, Lower case: 15")
self.assertEqual(count_upper_lower("12345AbCdEf"), "Upper case: 3, Lower case: 3")

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