diff --git a/lib/rb/spec/flat_spec.rb b/lib/rb/spec/flat_spec.rb
new file mode 100644
index 0000000..f378782
--- /dev/null
+++ b/lib/rb/spec/flat_spec.rb
@@ -0,0 +1,62 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+require 'spec_helper'
+
+describe 'generation' do
+  before do
+    require 'namespaced_nonblocking_service'
+  end
+
+  it "did not generate the wrong files" do
+    prefix = File.expand_path("../gen-rb/flat", __FILE__)
+    ["namespaced_spec_namespace/namespaced_nonblocking_service.rb",
+     "namespaced_spec_namespace/thrift_namespaced_spec_constants.rb",
+     "namespaced_spec_namespace/thrift_namespaced_spec_types.rb",
+     "other_namespace/referenced_constants.rb",
+     "other_namespace/referenced_types.rb"
+    ].each do |name|
+      File.exist?(File.join(prefix, name)).should_not be_true
+    end
+  end
+
+  it "generated the right files" do
+    prefix = File.expand_path("../gen-rb/flat", __FILE__)
+    ["namespaced_nonblocking_service.rb",
+     "thrift_namespaced_spec_constants.rb",
+     "thrift_namespaced_spec_types.rb",
+     "referenced_constants.rb",
+     "referenced_types.rb"
+    ].each do |name|
+      File.exist?(File.join(prefix, name)).should be_true
+    end
+  end
+
+  it "has a service class in the right place" do
+    defined?(NamespacedSpecNamespace::NamespacedNonblockingService).should be_true
+  end
+
+  it "has a struct in the right place" do
+    defined?(NamespacedSpecNamespace::Hello).should be_true
+  end
+
+  it "required an included file" do
+    defined?(OtherNamespace::SomeEnum).should be_true
+  end
+end
diff --git a/lib/rb/spec/spec_helper.rb b/lib/rb/spec/spec_helper.rb
index 8664b66..3672bf0 100644
--- a/lib/rb/spec/spec_helper.rb
+++ b/lib/rb/spec/spec_helper.rb
@@ -59,3 +59,6 @@
   COMPACT_PROTOCOL_TEST_STRUCT.set_byte_map = nil
   COMPACT_PROTOCOL_TEST_STRUCT.map_byte_map = nil
 end
+
+$:.unshift File.join(File.dirname(__FILE__), *%w[gen-rb/flat])
+