Writing test code for a function

[blissful sage]

Hi, I am writing a function that will use AWS S3's UploadPart API and hopefully contribute it to the s3 library, so far the function is working fine. I am having trouble designing a test for it as it will only accept a payload of minumum 5mb to be uploaded as a file part(AWS side requirement). Would generating a 5mb file within the test itself and using it be a good idea, especially in automated tests and such... ?

UploadPart : https://docs.aws.amazon.com/AmazonS3/latest/API/API_UploadPart.html

[autumn lodge]

can't we use mocking for this scenario? https://ballerina.io/learn/test-ballerina-code/mocking/