add rake tasks

.kokoro/build.bat

@@ -1,9 +1,4 @@
 REM This file runs tests for merges, PRs, and nightlies.
-REM There are a few rules for what tests are run:
-REM  * PRs run all non-acceptance tests for every library.
-REM  * Merges run all non-acceptance tests for every library, and acceptance tests for all altered libraries.
-REM  * Nightlies run all acceptance tests for every library.
-REM Currently only runs tests on 2.5.1
 
 SET url="https://raw.githubusercontent.com/googleapis/google-cloud-ruby/master/.kokoro/build.bat"
 

Rakefile

@@ -1,3 +1,34 @@
 require "bundler/gem_tasks"
 
 task default: :spec
+
+namespace :kokoro do
+  task :load_env_vars do
+    service_account = "#{ENV['KOKORO_GFILE_DIR']}/service-account.json"
+    ENV["GOOGLE_APPLICATION_CREDENTIALS"] = service_account
+    filename = "#{ENV['KOKORO_GFILE_DIR']}/env_vars.json"
+    env_vars = JSON.parse File.read(filename)
+    env_vars.each { |k, v| ENV[k] = v }
+  end
+
+  task :presubmit do
+    Rake::Task["spec"].invoke
+  end
+
+  task :continuous do
+    Rake::Task["spec"].invoke
+  end
+
+  task :nightly do
+    Rake::Task["spec"].invoke
+  end
+end
+
+def header str, token = "#"
+  line_length = str.length + 8
+  puts ""
+  puts token * line_length
+  puts "#{token * 3} #{str} #{token * 3}"
+  puts token * line_length
+  puts ""
+end