Update test docs to show new options

lib/cachex.ex

@@ -1129,10 +1129,13 @@ defmodule Cachex do
 
       iex> Cachex.put(:my_cache, "key1", "value1")
       iex> Cachex.put(:my_cache, "key2", "value2")
-      iex> Cachex.put(:my_cache, "key3", "value3")
+      iex> Cachex.put(:my_cache, "key3", "value3", expire: 1)
       iex> Cachex.size(:my_cache)
       { :ok, 3 }
 
+      iex> Cachex.size(:my_cache, expired: false)
+      { :ok, 2 }
+
   """
   @spec size(Cachex.t(), Keyword.t()) :: {status, number}
   def size(cache, options \\ []) when is_list(options),

test/cachex_test.exs

@@ -1,6 +1,5 @@
 defmodule CachexTest do
   use Cachex.Test.Case
-  import Integer
 
   # Ensures that we're able to start a cache and link it to the current process.
   # We verify the link by spawning a cache from inside another thread and making
@@ -163,7 +162,7 @@ defmodule CachexTest do
       |> Keyword.drop([:child_spec, :init, :start, :start_link])
 
     # it has to always be even (one signature creates ! versions)
-    assert(is_even(length(definitions)))
+    assert(rem(length(definitions), 2) == 0)
 
     # verify the size to cause errors on addition/removal
     assert(length(definitions) == 146)