Exclude gem backtrace filter if rubygems is not loaded

2 files changed, 19 insertions, 18 deletions

diff --git a/railties/lib/rails/backtrace_cleaner.rb b/railties/lib/rails/backtrace_cleaner.rb
index 2f5632c3e4..cd7dd0f80a 100644
--- a/railties/lib/rails/backtrace_cleaner.rb
+++ b/railties/lib/rails/backtrace_cleaner.rb
@@ -27,10 +27,10 @@ module Rails
       add_silencer { |line| RAILS_GEMS.any? { |gem| line =~ /^#{gem} / } }
       add_silencer { |line| line =~ %r(vendor/plugins/[^\/]+/lib) }
     end
-    
-    
+
     private
       def add_gem_filters
+        return unless defined? Gem
         (Gem.path + [Gem.default_dir]).uniq.each do |path|
           # http://gist.github.com/30430
           add_filter { |line| line.sub(/(#{path})\/gems\/([a-z]+)-([0-9.]+)\/(.*)/, '\2 (\3) \4')}
diff --git a/railties/test/backtrace_cleaner_test.rb b/railties/test/backtrace_cleaner_test.rb
index 64a47712b7..4e273852e0 100644
--- a/railties/test/backtrace_cleaner_test.rb
+++ b/railties/test/backtrace_cleaner_test.rb
@@ -29,25 +29,26 @@ else
   $stderr.puts 'No BacktraceFilter for minitest'
 end
 
-class BacktraceCleanerVendorGemTest < ActiveSupport::TestCase
-  def setup
-    @cleaner = Rails::BacktraceCleaner.new
-  end
-
-  test "should format installed gems correctly" do
-    @backtrace = [ "#{Gem.path[0]}/gems/nosuchgem-1.2.3/lib/foo.rb" ]
-    @result = @cleaner.clean(@backtrace)
-    assert_equal "nosuchgem (1.2.3) lib/foo.rb", @result[0]
-  end
+if defined? Gem
+  class BacktraceCleanerVendorGemTest < ActiveSupport::TestCase
+    def setup
+      @cleaner = Rails::BacktraceCleaner.new
+    end
 
-  test "should format installed gems not in Gem.default_dir correctly" do
-    @target_dir = Gem.path.detect { |p| p != Gem.default_dir }
-    # skip this test if default_dir is the only directory on Gem.path
-    if @target_dir
-      @backtrace = [ "#{@target_dir}/gems/nosuchgem-1.2.3/lib/foo.rb" ]
+    test "should format installed gems correctly" do
+      @backtrace = [ "#{Gem.path[0]}/gems/nosuchgem-1.2.3/lib/foo.rb" ]
       @result = @cleaner.clean(@backtrace)
       assert_equal "nosuchgem (1.2.3) lib/foo.rb", @result[0]
     end
-  end
 
+    test "should format installed gems not in Gem.default_dir correctly" do
+      @target_dir = Gem.path.detect { |p| p != Gem.default_dir }
+      # skip this test if default_dir is the only directory on Gem.path
+      if @target_dir
+        @backtrace = [ "#{@target_dir}/gems/nosuchgem-1.2.3/lib/foo.rb" ]
+        @result = @cleaner.clean(@backtrace)
+        assert_equal "nosuchgem (1.2.3) lib/foo.rb", @result[0]
+      end
+    end
+  end
 end