Use BUGSNAG_RELEASE_STAGE by default

Previously we read 'BUGSNAG_RELEASE_STAGE' only in the Rails
integration, so other apps had to use 'RACK_ENV' (if they run in Rack)
or set it manually in code

Now we will always use the 'BUGSNAG_RELEASE_STAGE' environment variable
if it's set

lib/bugsnag/configuration.rb

@@ -116,6 +116,7 @@ def initialize
       self.runtime_versions["ruby"] = RUBY_VERSION
       self.runtime_versions["jruby"] = JRUBY_VERSION if defined?(JRUBY_VERSION)
       self.timeout = 15
+      self.release_stage = ENV['BUGSNAG_RELEASE_STAGE']
       self.notify_release_stages = nil
       self.auto_capture_sessions = true
 

lib/bugsnag/integrations/railtie.rb

@@ -25,7 +25,7 @@ class Railtie < ::Rails::Railtie
       # initializer. If not, the key will be validated in after_initialize.
       Bugsnag.configure(false) do |config|
         config.logger = ::Rails.logger
-        config.release_stage = ENV["BUGSNAG_RELEASE_STAGE"] || ::Rails.env.to_s
+        config.release_stage ||= ::Rails.env.to_s
         config.project_root = ::Rails.root.to_s
         config.middleware.insert_before Bugsnag::Middleware::Callbacks, Bugsnag::Middleware::Rails3Request
         config.runtime_versions["rails"] = ::Rails::VERSION::STRING

spec/configuration_spec.rb

@@ -24,6 +24,21 @@
     end
   end
 
+  describe "release_stage" do
+    after(:each) do
+      ENV["BUGSNAG_RELEASE_STAGE"] = nil
+    end
+
+    it "has no default value" do
+      expect(subject.release_stage).to be_nil
+    end
+
+    it "uses the 'BUGSNAG_RELEASE_STAGE' environment variable if set" do
+      ENV["BUGSNAG_RELEASE_STAGE"] = "foobar"
+      expect(subject.release_stage).to eq("foobar")
+    end
+  end
+
   describe "#notify_endpoint" do
     it "defaults to DEFAULT_NOTIFY_ENDPOINT" do
       expect(subject.notify_endpoint).to eq(Bugsnag::Configuration::DEFAULT_NOTIFY_ENDPOINT)