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@@ -24,13 +24,13 @@ module QuietBacktrace
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       if Test::Unit::TestCase.quiet_backtrace
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         backtrace.reject! do |line|
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           [*Test::Unit::TestCase.backtrace_silencers].any? do |silencer_name|
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-            QuietBacktrace::BacktraceFilter.silencers[silencer_name].call(line)
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+            QuietBacktrace::BacktraceFilter.silencers[silencer_name].call(line) if silencer_name
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           end
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         end
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         backtrace.each do |line|
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           [*Test::Unit::TestCase.backtrace_filters].each do |filter_name|
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-            QuietBacktrace::BacktraceFilter.filters[filter_name].call(line)
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+            QuietBacktrace::BacktraceFilter.filters[filter_name].call(line) if filter_name
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           end
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         end          
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       end

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@@ -32,6 +32,7 @@ class QuietBacktraceTest < Test::Unit::TestCase
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   context "The default quiet backtrace" do
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     setup do
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+      reset_filter!
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       @mock = MockTestUnit.new
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       @default_quiet_backtrace = @mock.filter_backtrace(@backtrace.dup)
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     end
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@@ -48,8 +49,8 @@ class QuietBacktraceTest < Test::Unit::TestCase
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       assert !@default_quiet_backtrace.any? { |line| line =~ /\:in / }, "Method name was not removed from one or more lines: #{@default_quiet_backtrace}"
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     end
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-    should "remove rails root from the beginning of lines" do
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-      assert @default_quiet_backtrace.any? { |line| line == 'app/controllers/photos_controller.rb:315' }, "Rails root is not being filtered: #{@default_quiet_backtrace}"
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+    should "not silence or filter a legitimate line" do
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+      assert @default_quiet_backtrace.any? { |line| line == '/Users/james/Documents/railsApps/generating_station/app/controllers/photos_controller.rb:315' }, "Rails root is not being filtered: #{@default_quiet_backtrace}"
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     end
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   end
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@@ -57,19 +58,20 @@ class QuietBacktraceTest < Test::Unit::TestCase
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   context "The quiet backtrace with complementary Rails silencers and filters" do
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     setup do
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-      RAILS_ROOT = '/Users/james/Documents/railsApps/generating_station'
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-      Test::Unit::TestCase.backtrace_silencers << [:rails_vendor]
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-      Test::Unit::TestCase.backtrace_filters << [:rails_root]
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+      reset_filter!
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+      @rails_root = '/Users/james/Documents/railsApps/generating_station'
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+      self.backtrace_silencers << :rails_vendor
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+      self.backtrace_filters << :rails_root
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       @mock = MockTestUnit.new
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       @rails_quiet_backtrace = @mock.filter_backtrace(@backtrace.dup)
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     end
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-    should "from RAILS_ROOT/vendor directory" do
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-      assert !@rails_quiet_backtrace.any? { |line| line.include?("#{RAILS_ROOT}/vendor") }, "One or more lines from RAILS_ROOT/vendor directory are not being silenced: #{@rails_quiet_backtrace}"
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+    should "silence any line from the RAILS_ROOT/vendor directory" do
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+      assert !@rails_quiet_backtrace.any? { |line| line.include?("#{@rails_root}/vendor") }, "One or more lines from RAILS_ROOT/vendor directory are not being silenced: #{@rails_quiet_backtrace}"
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     end
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     should "remove RAILS_ROOT text from the beginning of lines" do
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-      assert !@rails_quiet_backtrace.any? { |line| line.include?("#{RAILS_ROOT}") }, "One or more lines that include RAILS_ROOT text are not being filtered: #{@rails_quiet_backtrace}"
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+      assert !@rails_quiet_backtrace.any? { |line| line.include?("#{@rails_root}") }, "One or more lines that include RAILS_ROOT text are not being filtered: #{@rails_quiet_backtrace}"
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     end
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   end
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@@ -77,7 +79,8 @@ class QuietBacktraceTest < Test::Unit::TestCase
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   context "Setting quiet backtrace to false" do
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     setup do
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-      Test::Unit::TestCase.quiet_backtrace = false
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+      reset_filter!
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+      self.quiet_backtrace = false
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       @mock = MockTestUnit.new
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       @unfiltered_backtrace = @mock.filter_backtrace(@backtrace.dup)
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     end
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@@ -88,10 +91,11 @@ class QuietBacktraceTest < Test::Unit::TestCase
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   end
0
   
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-  context "Overiding the defaults" do
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+  context "Overriding the defaults" do
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     setup do
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-      Test::Unit::TestCase.backtrace_silencers = [:test_unit, :rails_vendor]
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+      reset_filter!
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+      self.backtrace_silencers = [:test_unit, :rails_vendor]
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       @mock = MockTestUnit.new
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       @not_filtering_gem_root = @mock.filter_backtrace(@backtrace.dup)
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     end
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@@ -101,4 +105,13 @@ class QuietBacktraceTest < Test::Unit::TestCase
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     end
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   end
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+  
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+  private
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+  
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+    def reset_filter!
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+      self.quiet_backtrace = true
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+      self.backtrace_silencers = [:test_unit, :gem_root]
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+      self.backtrace_filters = [:method_name]
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+    end
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+  
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 end
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