Better formatting for downtime check messages

This removes excessive whitespace from the messages (e.g. leading
whitespace) and ensures the message is more clearly visible.

lib/gitlab/downtime_check/message.rb

 module Gitlab
   class DowntimeCheck
     class Message
-      attr_reader :path, :offline, :reason
+      attr_reader :path, :offline
       OFFLINE = "\e[31moffline\e[0m"
       ONLINE = "\e[32monline\e[0m"
@@ -19,10 +19,21 @@ module Gitlab
         label = offline ? OFFLINE : ONLINE
         message = "[#{label}]: #{path}"
-        message += ": #{reason}" if reason
+
+        if reason?
+          message += ":\n\n#{reason}\n\n"
+        end
         message
       end
+
+      def reason?
+        @reason.present?
+      end
+
+      def reason
+        @reason.strip.lines.map(&:strip).join("\n")
+      end
     end
   end
 end

spec/lib/gitlab/downtime_check/message_spec.rb

@@ -5,7 +5,7 @@ describe Gitlab::DowntimeCheck::Message do
     it 'returns an ANSI formatted String for an offline migration' do
       message = described_class.new('foo.rb', true, 'hello')
-      expect(message.to_s).to eq("[\e[31moffline\e[0m]: foo.rb: hello")
+      expect(message.to_s).to eq("[\e[31moffline\e[0m]: foo.rb:\n\nhello\n\n")
     end
     it 'returns an ANSI formatted String for an online migration' do
@@ -14,4 +14,26 @@ describe Gitlab::DowntimeCheck::Message do
       expect(message.to_s).to eq("[\e[32monline\e[0m]: foo.rb")
     end
   end
+
+  describe '#reason?' do
+    it 'returns false when no reason is specified' do
+      message = described_class.new('foo.rb')
+
+      expect(message.reason?).to eq(false)
+    end
+
+    it 'returns true when a reason is specified' do
+      message = described_class.new('foo.rb', true, 'hello')
+
+      expect(message.reason?).to eq(true)
+    end
+  end
+
+  describe '#reason' do
+    it 'strips excessive whitespace from the returned String' do
+      message = described_class.new('foo.rb', true, " hello\n world\n\n foo")
+
+      expect(message.reason).to eq("hello\nworld\n\nfoo")
+    end
+  end
 end