Last unit test updates for sandbox.

lib/cocoapods/installer.rb

@@ -91,7 +91,7 @@ module Pod
 
     def migrate_installation_if_needed
       UI.section "Performing existing installation migration" do
-        migrator = Migrator.new(lockfile.cocoapods_version, sandbox)
+        migrator = Migrator.new(sandbox)
         migrator.migrate!
       end
     end

lib/cocoapods/installer/migrator.rb

@@ -15,16 +15,17 @@ module Pod
 
       #
       #
-      def initialize(installation_version, sandbox)
-        @installation_version = installation_version
+      def initialize(sandbox)
         @sandbox = sandbox
       end
 
       #
       #
       def migrate!
+        if sandbox.manifest
           migrate_to_0_20 if version_minor('0.20')
         end
+      end
 
       #-----------------------------------------------------------------------#
 
@@ -67,6 +68,10 @@ module Pod
         installation_version < Version.new(target_version)
       end
 
+      def installation_version
+        sandbox.manifest.cocoapods_version
+      end
+
       def mkdir(path)
         path.mkpath
       end