1 files changed, 21 insertions, 0 deletions
diff --git a/railties/test/test_unit/runner_test.rb b/railties/test/test_unit/runner_test.rb
new file mode 100644
index 0000000000..cfc1d897b9
--- /dev/null
+++ b/railties/test/test_unit/runner_test.rb
@@ -0,0 +1,21 @@
+require 'abstract_unit'
+require 'rails/test_unit/runner'
+
+class TestUnitTestRunnerTest < ActiveSupport::TestCase
+  setup do
+    @options = Rails::TestRunner::Options
+  end
+
+  test "shows the filtered backtrace by default" do
+    options = @options.parse([])
+    assert_not options[:backtrace]
+  end
+
+  test "has --backtrace (-b) option to show the full backtrace" do
+    options = @options.parse(["-b"])
+    assert options[:backtrace]
+
+    options = @options.parse(["--backtrace"])
+    assert options[:backtrace]
+  end
+end