1 files changed, 97 insertions, 0 deletions
diff --git a/actionpack/test/dispatch/exception_wrapper_test.rb b/actionpack/test/dispatch/exception_wrapper_test.rb
new file mode 100644
index 0000000000..d7408164ba
--- /dev/null
+++ b/actionpack/test/dispatch/exception_wrapper_test.rb
@@ -0,0 +1,97 @@
+require 'abstract_unit'
+
+module ActionDispatch
+  class ExceptionWrapperTest < ActionDispatch::IntegrationTest
+    class TestError < StandardError
+      attr_reader :backtrace
+
+      def initialize(*backtrace)
+        @backtrace = backtrace.flatten
+      end
+    end
+
+    class BadlyDefinedError < StandardError
+      def backtrace
+        nil
+      end
+    end
+
+    setup do
+      Rails.stubs(:root).returns(Pathname.new('.'))
+
+      cleaner = ActiveSupport::BacktraceCleaner.new
+      cleaner.add_silencer { |line| line !~ /^lib/ }
+
+      @environment = { 'action_dispatch.backtrace_cleaner' => cleaner }
+    end
+
+    test '#source_extracts fetches source fragments for every backtrace entry' do
+      exception = TestError.new("lib/file.rb:42:in `index'")
+      wrapper = ExceptionWrapper.new({}, exception)
+
+      wrapper.expects(:source_fragment).with('lib/file.rb', 42).returns('foo')
+
+      assert_equal [ code: 'foo', line_number: 42 ], wrapper.source_extracts
+    end
+
+
+    test '#application_trace returns traces only from the application' do
+      exception = TestError.new(caller.prepend("lib/file.rb:42:in `index'"))
+      wrapper = ExceptionWrapper.new(@environment, exception)
+
+      assert_equal [ "lib/file.rb:42:in `index'" ], wrapper.application_trace
+    end
+
+    test '#application_trace cannot be nil' do
+      nil_backtrace_wrapper = ExceptionWrapper.new(@environment, BadlyDefinedError.new)
+      nil_cleaner_wrapper = ExceptionWrapper.new({}, BadlyDefinedError.new)
+
+      assert_equal [], nil_backtrace_wrapper.application_trace
+      assert_equal [], nil_cleaner_wrapper.application_trace
+    end
+
+    test '#framework_trace returns traces outside the application' do
+      exception = TestError.new(caller.prepend("lib/file.rb:42:in `index'"))
+      wrapper = ExceptionWrapper.new(@environment, exception)
+
+      assert_equal caller, wrapper.framework_trace
+    end
+
+    test '#framework_trace cannot be nil' do
+      nil_backtrace_wrapper = ExceptionWrapper.new(@environment, BadlyDefinedError.new)
+      nil_cleaner_wrapper = ExceptionWrapper.new({}, BadlyDefinedError.new)
+
+      assert_equal [], nil_backtrace_wrapper.framework_trace
+      assert_equal [], nil_cleaner_wrapper.framework_trace
+    end
+
+    test '#full_trace returns application and framework traces' do
+      exception = TestError.new(caller.prepend("lib/file.rb:42:in `index'"))
+      wrapper = ExceptionWrapper.new(@environment, exception)
+
+      assert_equal exception.backtrace, wrapper.full_trace
+    end
+
+    test '#full_trace cannot be nil' do
+      nil_backtrace_wrapper = ExceptionWrapper.new(@environment, BadlyDefinedError.new)
+      nil_cleaner_wrapper = ExceptionWrapper.new({}, BadlyDefinedError.new)
+
+      assert_equal [], nil_backtrace_wrapper.full_trace
+      assert_equal [], nil_cleaner_wrapper.full_trace
+    end
+
+    test '#traces returns every trace by category enumerated with an index' do
+      exception = TestError.new("lib/file.rb:42:in `index'", "/gems/rack.rb:43:in `index'")
+      wrapper = ExceptionWrapper.new(@environment, exception)
+
+      assert_equal({
+        'Application Trace' => [ id: 0, trace: "lib/file.rb:42:in `index'" ],
+        'Framework Trace' => [ id: 1, trace: "/gems/rack.rb:43:in `index'" ],
+        'Full Trace' => [
+          { id: 0, trace: "lib/file.rb:42:in `index'" },
+          { id: 1, trace: "/gems/rack.rb:43:in `index'" }
+        ]
+      }, wrapper.traces)
+    end
+  end
+end