Implement an integration test for evaluating a package.

lib/coursemology/evaluator.rb

@@ -17,6 +17,7 @@ module Coursemology::Evaluator
   autoload :Logging
   autoload :Models
   autoload :Services
+  autoload :StringIO
 
   # The logger to use for the client.
   mattr_reader(:logger) { ActiveSupport::Logger.new(STDOUT) }

lib/coursemology/evaluator/models/programming_evaluation.rb

@@ -30,7 +30,7 @@ def language=(language)
   def package
     @package ||= begin
       body = plain_request('courses/assessment/programming_evaluations/:id/package', id: id)
-      Package.new(StringIO.new(body))
+      Package.new(Coursemology::Evaluator::StringIO.new(body))
     end
   end
 

lib/coursemology/evaluator/string_io.rb

@@ -0,0 +1,13 @@
+# Adapter for StringIO for compatibility with RubyZip.
+#
+# StringIO does not inherit from IO, so RubyZip does not accept StringIO in place of IO.
+class Coursemology::Evaluator::StringIO < ::StringIO
+  def is_a?(klass)
+    klass == IO || super
+  end
+
+  # RubyZip assumes all IO objects respond to path.
+  def path
+    self
+  end
+end

spec/coursemology/evaluator/cli_spec.rb

@@ -46,6 +46,12 @@
           subject
         end
       end
+
+      it 'evaluates the package' do
+        VCR.use_cassette('client/pending_evaluation') do
+          subject
+        end
+      end
     end
   end