Copy slices

[tomwhoiscontrary]

A shot at a solution for issue #30.

The punchline is that if we generate a fake for a method:

    DoASlice([]byte)

It looks like:

func (fake *FakeSomething) DoASlice(arg1 []byte) {
    arg1Copy := make([]byte, len(arg1))
    copy(arg1Copy, arg1)
    fake.doASliceMutex.Lock()
    fake.doASliceArgsForCall = append(fake.doASliceArgsForCall, struct {
        arg1 []byte
    }{arg1Copy})
    fake.doASliceMutex.Unlock()
    if fake.DoASliceStub != nil {
        fake.DoASliceStub(arg1)
    }
}

[tjarratt]

I absolutely love this change. These variable names were so generic before, and now it makes sense!

[tjarratt]

This is awesome!

Thanks @tomwhoiscontrary! I appreciate you taking the time to contribute to counterfeiter.