Function holochain::test_utils::new_invocation

pub fn new_invocation<P, Z: Into<Zome>>(
    cell_id: &CellId, 
    func: &str, 
    payload: P, 
    zome: Z
) -> Result<ZomeCallInvocation, SerializedBytesError> where
    P: Serialize + Debug, 

Helper to create a zome invocation for tests