Remove test that may alter the repository

Library/Homebrew/test/test_ENV.rb

@@ -127,24 +127,12 @@ end
 class SuperenvTests < Homebrew::TestCase
   include SharedEnvTests
 
-  attr_reader :env, :bin
-
   def setup
     @env = {}.extend(Superenv)
-    @bin = HOMEBREW_REPOSITORY/"Library/ENV/#{MacOS::Xcode.version}"
-    bin.mkpath
-  end
-
-  def test_bin
-    assert_equal bin, Superenv.bin
   end
 
   def test_initializes_deps
-    assert_equal [], env.deps
-    assert_equal [], env.keg_only_deps
-  end
-
-  def teardown
-    bin.rmtree
+    assert_equal [], @env.deps
+    assert_equal [], @env.keg_only_deps
   end
 end