Don't test DocTest's doctests

Author: alco

lib/ex_unit/lib/ex_unit/doc_test.ex

@@ -52,12 +52,12 @@ defmodule ExUnit.DocTest do
       2
 
   If you want to keep any two tests separate from each other,
-  add an empty line between them (assume > to stand for iex> here):
+  add an empty line between them:
 
-      > a = 1
+      iex> a = 1
       1
 
-      > a + 1  # will fail with a "function a/0 undefined" error
+      iex> a + 1  # will fail with a "function a/0 undefined" error
       2
 
   Similarly to iex you can use numbers in your "prompts":

lib/ex_unit/test/ex_unit/doc_test_test.exs

@@ -90,7 +90,9 @@ end
 defmodule ExUnit.DocTestTest do
   use ExUnit.Case
 
-  doctest ExUnit.DocTest
+  # This is intentional. The doctests in DocTest's docs fail for demonstration
+  # purposes.
+  #doctest ExUnit.DocTest
   doctest ExUnit.DocTestTest.GoodModule, import: true
   doctest ExUnit.DocTestTest.SomewhatGoodModule, only: [test_fun: 0], import: true
   doctest ExUnit.DocTestTest.SomewhatGoodModule1, except: [test_fun1: 0], import: true