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Given an array of integers and a number. WAP to find the pairs …

Given an array of integers and a number. WAP to find the pairs which sum of upto given number.
I solved it. Then he asked about writing test cases for this function.
I wrote below test cases
1.) All the elements should be number.
2.) Length of array should not be 0.
3.) Array itself should not be null.
4.) Given number, arrayLength can be represented by 32bits or 64 bits.
5.) number should not be negative.
6.) Input does not has pair, It should return false
7.) Input has pair, It should return true
8.) Input has all negative values and pair exists, then function should return true
9.) Input has all negative values and pair does not exists, function should return false
He told that he is looking for more test cases. Can you guys think of some more complex test cases.
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