Steps to Reproduce:

1. create a test file like xxx_test.go
2. move cursor to a function name(not a function prefixed with Test) and generate a test function, a error message then appears in the corner

What impressed me is that the desired test function is appended to file, without overwriting the current content.

Is there any way to remove the error message? Every time I generate a test function, it will appear.

Though it may be uncommon to do it, but it's useful sometimes, would you mind supporting it?