Create a HoneyClient that drops every event on the floor. Useful both for
testing and possibly also for production code that needs a valid client but
wants to disable event sending for some reason.

client-options A map of options to pass to the client. This is the same as
               the options which can be passed to clj-honeycomb.core/init and
               clj-honeycomb.core/client. See the documentation for those
               functions for further details. (Map.)

Create a HoneyClient which records all events sent by conj'ing them onto the
atom-wrapped vector supplied.

events         This must be an (atom []) which will be used to store all
               events sent using this client. Each element added will be an
               instance of io.honeycomb.libhoney.eventdata.ResolvedEvent.
client-options A map of options to pass to the client. This is the same as
               the options which can be passed to clj-honeycomb.core/init and
               clj-honeycomb.core/client. See the documentation for those
               functions for further details. (Map.)

Execute some code that uses the implicit client created by
clj-honeycomb.core/init but trap all events sent and pass them to a
validation function.

Example:

(validate-events
  (fn []
    (with-event {"foo" "bar"}
      ... some code ...))
  (fn [events errors]
    (is (empty? errors))
    (is (= 1 (count events)))
    ... further validation of events ...))

client-options        The options to pass to the client, if any. This is the
                      same as the options passed to clj-honeycomb.core/init
                      and clj-honeycomb.core/client. See the documentation
                      for those functions for further details. (Map.
                      Optional.)
fn-that-sends-events  A 0-arity function which runs some code that may send
                      events using the implicit client created with
                      clj-honeycomb.core/init.
fn-to-validate-events A function which takes two arguments. The first is a
                      vector of io.honeycomb.libhoney.eventdata.ResolvedEvent
                      objects for every event sent by the code in
                      fn-that-sends-events. The second argument is a vector
                      of io.honeycomb.libhoney.responses.Response for any
                      errors that occurred during the sending of the events.