Return true from FakeFS::activate! and ::deactivate!

lib/fakefs/base.rb

@@ -16,6 +16,7 @@ module FakeFS
       const_set(:FileUtils, FakeFS::FileUtils)
       const_set(:FileTest,  FakeFS::FileTest)
     end
+    true
   end
 
   def self.deactivate!
@@ -30,6 +31,7 @@ module FakeFS
       const_set(:FileTest,  RealFileTest)
       const_set(:FileUtils, RealFileUtils)
     end
+    true
   end
 end
 

test/fakefs_test.rb

@@ -1370,6 +1370,15 @@ class FakeFSTest < Test::Unit::TestCase
     assert !Pathname.new("bar").exist?
   end
 
+  def test_activating_returns_true
+    FakeFS.deactivate!
+    assert_equal true, FakeFS.activate!
+  end
+
+  def test_deactivating_returns_true
+    assert_equal true, FakeFS.deactivate!
+  end
+
   def here(fname)
     RealFile.expand_path(File.join(RealFile.dirname(__FILE__), fname))
   end