[rubygems/rubygems] Fix error message building changing password of source

Do not change the password of the input parameter source during
anonymization, by using the proper helper instead of changing the
original uri directly.

https://github.com/rubygems/rubygems/commit/eaa2dd8a97

lib/rubygems/errors.rb

@@ -171,8 +171,7 @@ module Gem
     # An English description of the error.
 
     def wordy
-      @source.uri.password = 'REDACTED' unless @source.uri.password.nil?
-      "Unable to download data from #{@source.uri} - #{@error.message}"
+      "Unable to download data from #{Gem::Uri.new(@source.uri).redacted} - #{@error.message}"
     end
 
     ##

test/rubygems/test_gem_source_fetch_problem.rb

@@ -23,4 +23,14 @@ class TestGemSourceFetchProblem < Gem::TestCase
 
     refute_match sf.wordy, 'secret'
   end
+
+  def test_source_password_no_redacted
+    source = Gem::Source.new 'https://username:secret@gemsource.com'
+    error  = RuntimeError.new 'test'
+
+    sf = Gem::SourceFetchProblem.new source, error
+    sf.wordy
+
+    assert_match 'secret', source.uri.to_s
+  end
 end