Exclude running rake task in a clean environment on 1.8.7 or JRuby

Author: JonRowe

lib/rspec/core/rake_task.rb

@@ -45,8 +45,20 @@ class RakeTask < ::Rake::TaskLib
       # A message to print to stderr when there are failures.
       attr_accessor :failure_message
 
-      # Run RSpec with a clean (empty) environment.
-      attr_accessor :with_clean_environment
+      if RUBY_VERSION < "1.9.0" || Support::Ruby.jruby?
+        # Run RSpec with a clean (empty) environment is not supported
+        def with_clean_environment=(_value)
+          raise ArgumentError, "Running in a clean environment is not supported on Ruby versions before 1.9.0"
+        end
+
+        # Run RSpec with a clean (empty) environment is not supported
+        def with_clean_environment
+          false
+        end
+      else
+        # Run RSpec with a clean (empty) environment.
+        attr_accessor :with_clean_environment
+      end
 
       # Use verbose output. If this is set to true, the task will print the
       # executed spec command to stdout. Defaults to `true`.

spec/rspec/core/rake_task_spec.rb

@@ -149,7 +149,7 @@ def silence_output(&block)
     end
 
     context "with_clean_environment is set" do
-      it "removes the environment variables" do
+      it "removes the environment variables", :if => (RUBY_VERSION >= '1.9.0' || RSpec::Support::Ruby.jruby?) do
         with_env_vars 'MY_ENV' => 'ABC' do
           expect {
             task.with_clean_environment = true