Ensure the cassette_library_dir is isolated for all specs.

Trying to get builds to pass on travis-ci.org exposed some ordering dependencies between specs because of this setting.

spec/spec_helper.rb

@@ -36,7 +36,6 @@ def reset!(stubbing_lib = :fakeweb)
 end
 
 RSpec.configure do |config|
-  config.extend TempCassetteLibraryDir
   config.extend DisableWarnings
   config.extend MonkeyPatches::RSpecMacros
   config.extend WebMockMacros
@@ -59,6 +58,14 @@ def reset!(stubbing_lib = :fakeweb)
     VCR::HttpStubbingAdapters::Faraday.reset!
   end
 
+  # Ensure each example uses a different cassette library to keep them isolated.
+  config.around(:each) do |example|
+    Dir.mktmpdir do |dir|
+      VCR::Config.cassette_library_dir = dir
+      example.run
+    end
+  end
+
   config.after(:each) do
     VCR::HttpStubbingAdapters::Common.adapters.each do |a|
       a.ignored_hosts = []

spec/vcr/cassette_spec.rb

@@ -2,8 +2,6 @@
 
 describe VCR::Cassette do
   describe '#file' do
-    temp_dir "#{VCR::SPEC_ROOT}/fixtures/file", :assign_to_cassette_library_dir => true
-
     it 'combines the cassette_library_dir with the cassette name' do
       cassette = VCR::Cassette.new('the_file')
       cassette.file.should == File.join(VCR::Config.cassette_library_dir, 'the_file.yml')
@@ -161,6 +159,7 @@
           let(:interaction_1) { VCR::HTTPInteraction.new(VCR::Request.new(:get, 'http://example.com/'), VCR::Response.new(VCR::ResponseStatus.new)) }
           let(:interaction_2) { VCR::HTTPInteraction.new(VCR::Request.new(:get, 'http://example.com/'), VCR::Response.new(VCR::ResponseStatus.new)) }
           let(:interactions)  { [interaction_1, interaction_2] }
+          before(:each) { VCR::Config.cassette_library_dir = "#{VCR::SPEC_ROOT}/fixtures/#{YAML_SERIALIZATION_VERSION}/cassette_spec" }
 
           it 'updates the content_length headers when given :update_content_length_header => true' do
             VCR::YAML.stub(:load => interactions)
@@ -305,8 +304,6 @@
   end
 
   describe '#eject' do
-    temp_dir "#{VCR::SPEC_ROOT}/fixtures/cassette_spec_eject", :assign_to_cassette_library_dir => true
-
     [true, false].each do |orig_http_connections_allowed|
       it "resets #{orig_http_connections_allowed} on the http stubbing adapter if it was originally #{orig_http_connections_allowed}" do
         VCR.http_stubbing_adapter.should_receive(:http_connections_allowed?).and_return(orig_http_connections_allowed)
@@ -389,13 +386,11 @@
 
     [:all, :none, :new_episodes].each do |record_mode|
       context "for a :record => :#{record_mode} cassette with previously recorded interactions" do
-        temp_dir "#{VCR::SPEC_ROOT}/fixtures/#{YAML_SERIALIZATION_VERSION}/cassette_spec/temp", :assign_to_cassette_library_dir => true
-
         subject { VCR::Cassette.new('example', :record => record_mode, :match_requests_on => [:uri]) }
 
         before(:each) do
           base_dir = "#{VCR::SPEC_ROOT}/fixtures/#{YAML_SERIALIZATION_VERSION}/cassette_spec"
-          FileUtils.cp(base_dir + "/example.yml", base_dir + "/temp/example.yml")
+          FileUtils.cp(base_dir + "/example.yml", VCR::Config.cassette_library_dir + "/example.yml")
         end
 
         it "restore the stubs checkpoint on the http stubbing adapter" do

spec/vcr/config_spec.rb

@@ -7,10 +7,11 @@ def stub_no_http_stubbing_adapter
   end
 
   describe '.cassette_library_dir=' do
-    temp_dir(File.expand_path(File.dirname(__FILE__) + '/fixtures/config_spec'))
-
     it 'creates the directory if it does not exist' do
-      expect { VCR::Config.cassette_library_dir = @temp_dir }.to change { File.exist?(@temp_dir) }.from(false).to(true)
+      Dir.mktmpdir do |dir|
+        dir += '/cassettes'
+        expect { VCR::Config.cassette_library_dir = dir }.to change { File.exist?(dir) }.from(false).to(true)
+      end
     end
 
     it 'does not raise an error if given nil' do