can't handle method/function signatures with variadicts

[shackra]

I've discovered that mockigo cannot handle methods or functions with variadict as arguments. I have a repository with code that demonstrates the bug:

https://github.com/shackra/mockigo-variadic-bug

if you run just run, you'll see that the example works as expected:

$ just run
go build -o mockigo-variadic-bug
./mockigo-variadic-bug
adding numbers for hello world...
hello world is 11

With just test you can run the tests.

However, in tests, we don't have any way to set an argument for a variadict argument, we have to use match.Any instead.

mock.EXPECT().
		Sum(match.AnyCtx(), match.Eq("test"), match.Any[int]()). // <- unable to use match.Arg[[]int]
		Return(18)

if we want to leave that argument empty, we get a different error:

$ just test
go test -covermode=count -coverprofile coverage ./...
--- FAIL: TestCalculator (0.00s)
    library.go:17: Unexpected call of method "Sum" because:
        expected call /tmp/example/library_test.go:15 expects 2 arguments, got 3
FAIL
        github.com/shackra/mockigo-variadic-bug coverage: 30.0% of statements
FAIL    github.com/shackra/mockigo-variadic-bug 0.002s
FAIL
error: Recipe `test` failed on line 2 with exit code 1