Move a script which has a pre-requirement to outside of spec

And make it to be execute when using `./tools/run_tests/run_tests.py -l ruby`

src/ruby/end2end/package_with_underscore_checker.rb

@@ -0,0 +1,54 @@
+# Copyright 2018 gRPC authors.
+#
+# Licensed 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 'open3'
+require 'tmpdir'
+
+def main
+  root_dir = File.join(File.dirname(__FILE__), '..', '..', '..')
+  pb_dir = File.join(root_dir, 'src', 'ruby', 'end2end', 'protos')
+
+  fail 'CONFIG env variable unexpectedly unset' unless ENV['CONFIG']
+  bins_sub_dir = ENV['CONFIG']
+  bins_dir = File.join(root_dir, 'bins', bins_sub_dir)
+
+  plugin = File.join(bins_dir, 'grpc_ruby_plugin')
+  protoc = File.join(bins_dir, 'protobuf', 'protoc')
+
+  got = nil
+
+  Dir.mktmpdir do |tmp_dir|
+    gen_out = File.join(tmp_dir, 'package_with_underscore', 'service_services_pb.rb')
+
+    pid = spawn(
+      protoc,
+      "--proto_path=#{pb_dir}",
+      'package_with_underscore/service.proto',
+      "--grpc_out=#{tmp_dir}",
+      "--plugin=protoc-gen-grpc=#{plugin}"
+    )
+    Process.waitpid2(pid)
+    File.open(gen_out) { |f| got = f.read }
+  end
+
+  correct_modularized_rpc = 'rpc :TestOne, ' \
+                            'Grpc::Testing::PackageWithUnderscore::Data::Request, ' \
+                            'Grpc::Testing::PackageWithUnderscore::Data::Response'
+
+  return if got.include?(correct_modularized_rpc)
+
+  fail 'generated file does not match with correct_modularized_rpc'
+end
+
+main

src/ruby/spec/pb/package_with_underscore/checker_spec.rb

@@ -1,51 +0,0 @@
-# Copyright 2016 gRPC authors.
-#
-# Licensed 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 'open3'
-require 'tmpdir'
-
-describe 'Package with underscore protobuf code generation' do
-  it 'should have the same content as created by code generation' do
-    root_dir = File.join(File.dirname(__FILE__), '..', '..', '..', '..', '..')
-    pb_dir = File.join(root_dir, 'src', 'ruby', 'spec', 'pb')
-
-    fail 'CONFIG env variable unexpectedly unset' unless ENV['CONFIG']
-    bins_sub_dir = ENV['CONFIG']
-    bins_dir = File.join(root_dir, 'bins', bins_sub_dir)
-
-    plugin = File.join(bins_dir, 'grpc_ruby_plugin')
-    protoc = File.join(bins_dir, 'protobuf', 'protoc')
-
-    got = nil
-
-    Dir.mktmpdir do |tmp_dir|
-      gen_out = File.join(tmp_dir, 'package_with_underscore', 'service_services_pb.rb')
-
-      pid = spawn(
-        protoc,
-        '-I.',
-        'package_with_underscore/service.proto',
-        "--grpc_out=#{tmp_dir}",
-        "--plugin=protoc-gen-grpc=#{plugin}",
-        chdir: pb_dir)
-      Process.waitpid2(pid)
-      File.open(gen_out) { |f| got = f.read }
-    end
-
-    correct_modularized_rpc = 'rpc :TestOne, '                \
-      'Grpc::Testing::PackageWithUnderscore::Data::Request, ' \
-      'Grpc::Testing::PackageWithUnderscore::Data::Response'
-    expect(got).to include(correct_modularized_rpc)
-  end
-end

tools/run_tests/helper_scripts/build_ruby.sh

@@ -23,3 +23,6 @@ cd "$(dirname "$0")/../../.."
 
 rm -rf ./tmp
 rake compile
+
+# build grpc_ruby_plugin
+make grpc_ruby_plugin -j8

tools/run_tests/helper_scripts/run_ruby.sh

@@ -18,7 +18,4 @@ set -ex
 # change to grpc repo root
 cd "$(dirname "$0")/../../.."
 
-# build grpc_ruby_plugin
-make grpc_ruby_plugin -j8
-
 rake

tools/run_tests/helper_scripts/run_ruby_end2end_tests.sh

@@ -29,4 +29,5 @@ ruby src/ruby/end2end/grpc_class_init_driver.rb || EXIT_CODE=1
 ruby src/ruby/end2end/multiple_killed_watching_threads_driver.rb || EXIT_CODE=1
 ruby src/ruby/end2end/load_grpc_with_gc_stress_driver.rb || EXIT_CODE=1
 ruby src/ruby/end2end/client_memory_usage_driver.rb || EXIT_CODE=1
+ruby src/ruby/end2end/package_with_underscore_checker.rb || EXIT_CODE=1
 exit $EXIT_CODE