Merge pull request #11030 from mjtko/fix/backtrace-silencer-noise-with-multiple-silencers

Fix BacktraceSilencer#noise when multiple silencers are configured

activesupport/CHANGELOG.md

+*   Fix return value from `BacktraceCleaner#noise` when the cleaner is configured
+    with multiple silencers.
+
+    Fixes #11030
+
+    *Mark J. Titorenko*
+
 *   `HashWithIndifferentAccess#select` now returns a `HashWithIndifferentAccess`
     instance instead of a `Hash` instance.
 

activesupport/lib/active_support/backtrace_cleaner.rb

@@ -97,11 +97,7 @@ def silence(backtrace)
       end
 
       def noise(backtrace)
-        @silencers.each do |s|
-          backtrace = backtrace.select { |line| s.call(line) }
-        end
-
-        backtrace
+        backtrace - silence(backtrace)
       end
   end
 end

activesupport/test/clean_backtrace_test.rb

@@ -36,6 +36,27 @@ def setup
   end
 end
 
+class BacktraceCleanerMultipleSilencersTest < ActiveSupport::TestCase
+  def setup
+    @bc = ActiveSupport::BacktraceCleaner.new
+    @bc.add_silencer { |line| line =~ /mongrel/ }
+    @bc.add_silencer { |line| line =~ /yolo/ }
+  end
+
+  test "backtrace should not contain lines that match the silencers" do
+    assert_equal \
+      [ "/other/class.rb" ],
+      @bc.clean([ "/mongrel/class.rb", "/other/class.rb", "/mongrel/stuff.rb", "/other/yolo.rb" ])
+  end
+
+  test "backtrace should only contain lines that match the silencers" do
+    assert_equal \
+      [ "/mongrel/class.rb", "/mongrel/stuff.rb", "/other/yolo.rb" ],
+      @bc.clean([ "/mongrel/class.rb", "/other/class.rb", "/mongrel/stuff.rb", "/other/yolo.rb" ],
+                :noise)
+  end
+end
+
 class BacktraceCleanerFilterAndSilencerTest < ActiveSupport::TestCase
   def setup
     @bc = ActiveSupport::BacktraceCleaner.new