test/unit.rb: --excludes-dir list

* test/lib/test/unit.rb (ExcludesOption): allow directory list by
  PATH_SEPARATOR to --excludes-dir option.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49206 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/lib/test/unit.rb

@@ -857,26 +857,32 @@ module Test
           end
         end
 
-        def self.load(dir, name)
-          return unless dir and name
-          path = File.join(dir, name.gsub(/::/, '/') + ".rb")
-          begin
-            src = File.read(path)
-          rescue Errno::ENOENT
-            nil
-          else
-            instance = new({})
-            instance.instance_eval(src)
-            instance
+        def self.load(dirs, name)
+          return unless dirs and name
+          instance = nil
+          dirs.each do |dir|
+            path = File.join(dir, name.gsub(/::/, '/') + ".rb")
+            begin
+              src = File.read(path)
+            rescue Errno::ENOENT
+              nil
+            else
+              instance ||= new({})
+              instance.instance_eval(src)
+            end
           end
+          instance
         end
       end
 
       def setup_options(parser, options)
         super
-        options[:excludes] = ENV["EXCLUDES"]
+        if excludes = ENV["EXCLUDES"]
+          excludes = excludes.split(File::PATH_SEPARATOR)
+        end
+        options[:excludes] = excludes || []
         parser.on '-X', '--excludes-dir DIRECTORY', "Directory name of exclude files" do |d|
-          options[:excludes] = d
+          options[:excludes].concat d.split(File::PATH_SEPARATOR)
         end
       end